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  • MPI: is there mpi libraries capable of message compression?

    - by osgx
    Sometimes MPI is used to send low-entropy data in messages. So it can be useful to try to compress messages before sending it. I know that MPI can work on very fast networks (10 Gbit/s and more), but many MPI programs are used with cheap network like 0,1G or 1Gbit/s Ethernet and with cheap (slow, low bisection) network switch. There is a very fast Snappy (wikipedia) compression algorithm, which has Compression speed is 250 MB/s and decompression speed is 500 MB/s so on compressible data and slow network it will give some speedup. Is there any MPI library which can compress MPI messages (at layer of MPI; not the compression of ip packets like in PPP). MPI messages are also structured, so there can be some special method, like compression of exponent part in array of double.

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  • Our embedded linux system won't recognize a USB Device if it is plugged in before powerup. Suggestions?

    - by Blaine
    We are developing on a small embedded device. This device us a gumstix overo board running OpenEmbedded linux. We have our development almost completely done, and have run into the strangest of bugs that we can't figure out. We have a USB Device (Spectrophotometer) that has a USB2.0 Connection and an external power supply for the light source. Typical behavior is that you plug in the power supply, then the USB connection to a host. When the usb connection is detected by the device, the device boots up and enables the light source and fan. The device is then able to be used by the host system. The problem is that if the device is plugged into the Gumstix before we turn on the Gumstix, the USB Device apparently is not probed by the system (and hence does not turn on). Under a normal situation, when the connection is initialized by plugging in the usb cable, the spectro turns itself on and becomes available to the system (this can be seen via "lsusb" typically). Neither of these things are happening. There is no device detected via "lsusb" and no dmesg errors of any kind that we can see. It is as if the device is not plugged in. The device does show up and work fine if we unplug the USB cable and plug it back in once the system is booted up. It turns on and shows up on the usb bus, and we can access it with our driver. On any other desktop or laptop, it does not matter if the host system is on or off when we plug in the spectrometer. This behavior is what I would consider to be "normal" - that the usb system is probed and initialized at boot time, and the usb devices come online. In other words, our system is fully functional as long as we plug in the usb device after the system is booted up. Unfortunately this isn't possible in our final product - everything comes on at once. Additional Info: 1) We have tried a flash drive attached to the system when the system is turned off. Booting up the system brings the flash drive online, as expected 2) There are no messages regarding the spectro or usb device (using dmesg). "lsusb" only lists the USB hubs / controllers. It is literally as if the device is not present and not plugged in. 3) We have tried a brand new image from gumstix and an older image from last year. Both images have this problem. This problem exists on all 3 gumstix devices we use. Does anyone have any suggestions? From what I can tell it isn't really possible to do a complete "reboot" of the usb system that is a complete emulation of "unplugging" and "replugging" a usb device. I feel like what is happening is that there is no initial probe on the usb bus that would trigger the usb handshaking, but this is somehow specific to the spectro. This seems to be a kernel issue or at least an issue in how the kernel is initializing the usb subsystem. I'm not really sure though. I have tried the gumstix mailing list, but there doesn't seem to be anyone who has seen this issue before. Any advice or suggestions on where to start looking would be fantastic. Thank you! Blaine output etc. $ uname -a Linux overo 2.6.33 #1 Tue Apr 27 08:35:38 PDT 2010 armv7l GNU/Linux When the system is up and running and spectro is plugged in (working as intended), this is lsusb: Bus 001 Device 116: ID 2457:1022 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x2457 idProduct 0x1022 bcdDevice 0.02 iManufacturer 1 USB4000 1.01.11 iProduct 2 Ocean Optics USB4000 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 46 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 400mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 4 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x86 EP 6 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered) dmesg output: usb usb1: usb auto-resume hub 1-0:1.0: hub_resume usb usb2: usb auto-resume ehci-omap ehci-omap.0: resume root hub hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000 hub 2-0:1.0: hub_resume hub 2-0:1.0: state 7 ports 3 chg 0000 evt 0000 hub 1-0:1.0: hub_suspend usb usb1: bus auto-suspend hub 2-0:1.0: hub_suspend usb usb2: bus auto-suspend ehci-omap ehci-omap.0: suspend root hub usb usb2: usb resume ehci-omap ehci-omap.0: resume root hub hub 2-0:1.0: hub_resume ehci-omap ehci-omap.0: GetStatus port 2 status 001803 POWER sig=j CSC CONNECT hub 2-0:1.0: port 2: status 0501 change 0001 hub 2-0:1.0: state 7 ports 3 chg 0004 evt 0000 hub 2-0:1.0: port 2, status 0501, change 0000, 480 Mb/s ehci-omap ehci-omap.0: port 2 high speed ehci-omap ehci-omap.0: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT usb 2-2: new high speed USB device using ehci-omap and address 2 ehci-omap ehci-omap.0: port 2 high speed ehci-omap ehci-omap.0: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT usb 2-2: default language 0x0409 usb 2-2: udev 2, busnum 2, minor = 129 usb 2-2: New USB device found, idVendor=2457, idProduct=1022 usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 2-2: Product: Ocean Optics USB4000 usb 2-2: Manufacturer: USB4000 1.01.11 usb 2-2: uevent usb 2-2: usb_probe_device usb 2-2: configuration #1 chosen from 1 choice usb 2-2: uevent usb 2-2: adding 2-2:1.0 (config #1, interface 0) usb 2-2:1.0: uevent drivers/usb/core/inode.c: creating file '002' dmesg has nothing to say, and lusb simply lists nothing else but the two default usb controllers / hubs if we plug the device in before the system is turned on.

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  • how to better use of eclipse code templates (PHP)?

    - by pocketfullofcheese
    One particular problem I was having was using ${word_selection} in an Eclipse PDT template. I was recently trying to use some code templates with Eclipse PDT 2.1 to speed up some common tasks. We use a lot of getters/setters, so I wrote the following template. function get${word_selection}() { return $$this->getData('${word_selection}'); } function set${word_selection}($$${word_selection}) { $$this->setData('${word_selection}', $$${word_selection}); } I named the template "getset" and the only way I know to use the Code Assist is to type: "getset" then hit my code assist keys (I have it set to Esc, but I think the default was Ctrl+Space). The problem is, this doesn't actually let me select a word to be used by the ${word_selection}. how do I type in my template name, hit the key combo, and have a word selected all at the same time? I also want to know what kinds of templates people have set up and any other tips for using templates to speed of programming.

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  • Should I use Python or Assembly for a super fast copy program

    - by PyNEwbie
    As a maintenance issue I need to routinely (3-5 times per year) copy a repository that is now has over 20 million files and exceeds 1.5 terabytes in total disk space. I am currently using RICHCOPY, but have tried others. RICHCOPY seems the fastest but I do not believe I am getting close to the limits of the capabilities of my XP machine. I am toying around with using what I have read in The Art of Assembly Language to write a program to copy my files. My other thought is to start learning how to multi-thread in Python to do the copies. I am toying around with the idea of doing this in Assembly because it seems interesting, but while my time is not incredibly precious it is precious enough that I am trying to get a sense of whether or not I will see significant enough gains in copy speed. I am assuming that I would but I only started really learning to program 18 months and it is still more or less a hobby. Thus I may be missing some fundamental concept of what happens with interpreted languages. Any observations or experiences would be appreciated. Note, I am not looking for any code. I have already written a basic copy program in Python 2.6 that is no slower than RICHCOPY. I am looking for some observations on which will give me more speed. Right now it takes me over 50 hours to make a copy from a disk to a Drobo and then back from the Drobo to a disk. I have a LogicCube for when I am simply duplicating a disk but sometimes I need to go from a disk to Drobo or the reverse. I am thinking that given that I can sector copy a 3/4 full 2 terabyte drive using the LogicCube in under seven hours I should be able to get close to that using Assembly, but I don't know enough to know if this is valid. (Yes, sometimes ignorance is bliss) The reason I need to speed it up is I have had two or three cycles where something has happened during copy (fifty hours is a long time to expect the world to hold still) that has caused me to have to trash the copy and start over. For example, last week the water main broke under our building and shorted out the power.

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  • What is the bit size of long on 64-bit Windows?

    - by acidzombie24
    Not to long ago someone told me that long are not 64 bits on 64 bit machines and i should always use int. This did not make sense to me. I seen docs (such as the one on apples official site) say that long are indeed 64 bits when compiling for a 64bit CPU. I looked up what it was on windows and found Windows: long and int remain 32-bit in length, and special new data types are defined for 64-bit integers. from http://www.intel.com/cd/ids/developer/asmo-na/eng/197664.htm?page=2 What should i use? should i define something like uw, sw ((un)signed width) as a long if not on windows. Otherwise do a check on the target CPU bitsize?

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  • How to ignore/prevent javadoc folder from validation during Eclipse Build?

    - by h2g2java
    In my war is a huge javadoc folder. There is no point in validating it since javadocs are produced by Sun(Oracle) javadoc utility. I have forgotten how I did it the last time. I need to tell Eclipse build not to validate that particular folder. Reasons why I need it: 1. the html produced by Sun javadoc generation utility does not meet the requirement that Eclipse uses - there is a bug report in Eclipse but Eclipse responds that Sun javadoc generator non-compliance is not their fault and that Eclipse intends to stick to their strict compliance. Which results in lots of html errors listed in the problems tab. 2. the javadoc folder is a remote link and high activity on that link is using up my cpu resource, and because it is a link to a remote location, that cpu high activity is sustained for long time until it finishes scanning the whole 35MB javadocs. Thanks - need help.

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  • JSON in COCOA (with YAJL)

    - by mekanics
    at first, sry for my english... :) I'm using the YAJL Framework http://github.com/gabriel/yajl-objc My file look like this: [ [ 3753700, { "altitude" : 36950, "heading" : 129.918421384319, "latitude" : 47.554033252495699, "longitude" : 8.2125612837369903, "pointType" : "EXTRAPOLATED", "speed" : 455.04395392093699, "timestamp" : 1273252673301, "verticalRate" : 0.0 } ], [ 3753700, { "altitude" : 36950, "heading" : 129.918421384319, "latitude" : 47.552708437680799, "longitude" : 8.2149074662342798, "pointType" : "EXTRAPOLATED", "speed" : 455.04395392093699, "timestamp" : 1273252674555, "verticalRate" : 0.0 } ] ] I've tried it in x-variant, but I always get a 'NSInvalidArgumentException' from console: 2010-05-07 20:17:30.998 testApp[2365:207] *** -[NSConcreteData yajl_JSON]: unrecognized selector sent to instance 0x1353d0 2010-05-07 20:17:31.006 testApp[2365:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSConcreteData yajl_JSON]: unrecognized selector sent to instance 0x1353d0' How to read the data correctly? thx for help

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  • Identify cause of hundreds of AJP threads in Tomcat

    - by Rich
    We have two Tomcat 6.0.20 servers fronted by Apache, with communication between the two using AJP. Tomcat in turn consumes web services on a JBoss cluster. This morning, one of the Tomcat machines was using 100% of CPU on 6 of the 8 cores on our machine. We took a heap dump using JConsole, and then tried to connect JVisualVM to get a profile to see what was taking all the CPU, but this caused Tomcat to crash. At least we had the heap dump! I have loaded the heap dump into Eclipse MAT, where I have found that we have 565 instances of java.lang.Thread. Some of these, obviously, are entirely legitimate, but the vast majority are named "ajp-6009-XXX" where XXX is a number. I know my way around Eclipse MAT pretty well, but haven't been able to find an explanation for it. If anyone has some pointers as to why Tomcat may be doing this, or some hints on finding out why using Eclipse MAT, that'd be appreciated!

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  • Make character escape from shot

    - by M28
    Hello all math masters, I got a problem for you: I have a 2D game (top down), and I would like to make the character escape from a shot, but not just walk away from the shot (I mean, don't be pushed by the shot), I want it to have a good dodging skills. The variables are: shotX - shot x position shotY - shot y position shotSpeedX - shot x speed shotSpeedY - shot x speed charX - character x position charY - character y position keyLeft - Set to true to make the character press the to left key keyRight - Set to true to make the character press the to right key keyUp - Set to true to make the character press the to up key keyDown - Set to true to make the character press the down key I can understand the following languages: C/C++ Java Actionscript 2/3 Javascript

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  • OpenMP + SSE gives no speedup

    - by Sayan Ghosh
    Hi, My Professor found out this interesting experiment of 3D Linearly separable Kernel Convolution using SSE and OpenMP, and gave the task to me to benchmark the statistics on our system. The author claims a crazy 18 fold speedup from the serial approach! Might not be always, but we were expecting at least a 2-4 times speedup running this on a Dual Core Intel. http://software.intel.com/en-us/articles/16bit-3d-convolution-sse4openmp-implementation-on-penryn-cpu/#comment-41994 Alas, we could find exactly no speedup. The serial code performs always better, with or without OpenMP. I am using Linux, and observed a certain trend...when no other processes are running on the system, after a while the loadavg starts increasing, and the the %CPU utilization falls down. Another probable false positive which I ran into accidentally...I started the program, then immediately paused it. Then I ran it on background with bg, and saw a speedup of more than 2. This happens all the time! Any advice would be great. Thanks, Sayan

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  • Is Stopwatch really broken?

    - by Jakub Šturc
    At MSDN page for Stopwatch class I discovered link to interesting article which makes following statement about Stopwatch: However there are some serious issues: This can be unreliable on a PC with multiple processors. Due to a bug in the BIOS, Start() and Stop() must be executed on the same processor to get a correct result. This is unreliable on processors that do not have a constant clock speed (most processors can reduce the clock speed to conserve energy). This is explained in detail here. I am little confused. I've seen tons of examples of using Stopwatch and nobody mention this drawbacks. How serious is this? Should I avoid using Stopwatch?

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  • Conflict between two Javascripts (MailChimp validation etc. scripts & jQuery hSlides.js)

    - by Brian
    I have two scripts running on the same page, one is the jQuery.hSlides.js script http://www.jesuscarrera.info/demos/hslides/ and the other is a custom script that is used for MailChimp list signup integration. The hSlides panel can be seen in effect here: http://theatricalbellydance.com. I've turned off the MailChimp script because it was conflicting with the hSlides script, causing it not to to fail completely (as seen here http://theatricalbellydance.com/home2/). Can someone tell me what could be done to the hSlides script to stop the conflict with the MailChimp script? The MailChimp Script var fnames = new Array(); var ftypes = new Array(); fnames[0] = 'EMAIL'; ftypes[0] = 'email'; fnames[3] = 'MMERGE3'; ftypes[3] = 'text'; fnames[1] = 'FNAME'; ftypes[1] = 'text'; fnames[2] = 'LNAME'; ftypes[2] = 'text'; fnames[4] = 'MMERGE4'; ftypes[4] = 'address'; fnames[6] = 'MMERGE6'; ftypes[6] = 'number'; fnames[9] = 'MMERGE9'; ftypes[9] = 'text'; fnames[5] = 'MMERGE5'; ftypes[5] = 'text'; fnames[7] = 'MMERGE7'; ftypes[7] = 'text'; fnames[8] = 'MMERGE8'; ftypes[8] = 'text'; fnames[10] = 'MMERGE10'; ftypes[10] = 'text'; fnames[11] = 'MMERGE11'; ftypes[11] = 'text'; fnames[12] = 'MMERGE12'; ftypes[12] = 'text'; var err_style = ''; try { err_style = mc_custom_error_style; } catch (e) { err_style = 'margin: 1em 0 0 0; padding: 1em 0.5em 0.5em 0.5em; background: rgb(255, 238, 238) none repeat scroll 0% 0%; font-weight: bold; float: left; z-index: 1; width: 80%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; color: rgb(255, 0, 0);'; } var mce_jQuery = jQuery.noConflict(); mce_jQuery(document).ready(function ($) { var options = { errorClass: 'mce_inline_error', errorElement: 'div', errorStyle: err_style, onkeyup: function () {}, onfocusout: function () {}, onblur: function () {} }; var mce_validator = mce_jQuery("#mc-embedded-subscribe-form").validate(options); options = { url: 'http://theatricalbellydance.us1.list-manage.com/subscribe/post-json?u=1d127e7630ced825cb1a8b5a9&id=9f12d2a6bb&c=?', type: 'GET', dataType: 'json', contentType: "application/json; charset=utf-8", beforeSubmit: function () { mce_jQuery('#mce_tmp_error_msg').remove(); mce_jQuery('.datefield', '#mc_embed_signup').each(function () { var txt = 'filled'; var fields = new Array(); var i = 0; mce_jQuery(':text', this).each(function () { fields[i] = this; i++; }); mce_jQuery(':hidden', this).each(function () { if (fields[0].value == 'MM' && fields[1].value == 'DD' && fields[2].value == 'YYYY') { this.value = ''; } else if (fields[0].value == '' && fields[1].value == '' && fields[2].value == '') { this.value = ''; } else { this.value = fields[0].value + '/' + fields[1].value + '/' + fields[2].value; } }); }); return mce_validator.form(); }, success: mce_success_cb }; mce_jQuery('#mc-embedded-subscribe-form').ajaxForm(options); }); function mce_success_cb(resp) { mce_jQuery('#mce-success-response').hide(); mce_jQuery('#mce-error-response').hide(); if (resp.result == "success") { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(resp.msg); mce_jQuery('#mc-embedded-subscribe-form').each(function () { this.reset(); }); } else { var index = -1; var msg; try { var parts = resp.msg.split(' - ', 2); if (parts[1] == undefined) { msg = resp.msg; } else { i = parseInt(parts[0]); if (i.toString() == parts[0]) { index = parts[0]; msg = parts[1]; } else { index = -1; msg = resp.msg; } } } catch (e) { index = -1; msg = resp.msg; } try { if (index == -1) { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } else { err_id = 'mce_tmp_error_msg'; html = '<div id="' + err_id + '" style="' + err_style + '"> ' + msg + '</div>'; var input_id = '#mc_embed_signup'; var f = mce_jQuery(input_id); if (ftypes[index] == 'address') { input_id = '#mce-' + fnames[index] + '-addr1'; f = mce_jQuery(input_id).parent().parent().get(0); } else if (ftypes[index] == 'date') { input_id = '#mce-' + fnames[index] + '-month'; f = mce_jQuery(input_id).parent().parent().get(0); } else { input_id = '#mce-' + fnames[index]; f = mce_jQuery().parent(input_id).get(0); } if (f) { mce_jQuery(f).append(html); mce_jQuery(input_id).focus(); } else { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } } } catch (e) { mce_jQuery('#mce-' + resp.result + '-response').show(); mce_jQuery('#mce-' + resp.result + '-response').html(msg); } } } The hslides script: /* * hSlides (1.0) // 2008.02.25 // <http://plugins.jquery.com/project/hslides> * * REQUIRES jQuery 1.2.3+ <http://jquery.com/> * * Copyright (c) 2008 TrafficBroker <http://www.trafficbroker.co.uk> * Licensed under GPL and MIT licenses * * hSlides is an horizontal accordion navigation, sliding the panels around to reveal one of interest. * * Sample Configuration: * // this is the minimum configuration needed * $('#accordion').hSlides({ * totalWidth: 730, * totalHeight: 140, * minPanelWidth: 87, * maxPanelWidth: 425 * }); * * Config Options: * // Required configuration * totalWidth: Total width of the accordion // default: 0 * totalHeight: Total height of the accordion // default: 0 * minPanelWidth: Minimum width of the panel (closed) // default: 0 * maxPanelWidth: Maximum width of the panel (opened) // default: 0 * // Optional configuration * midPanelWidth: Middle width of the panel (centered) // default: 0 * speed: Speed for the animation // default: 500 * easing: Easing effect for the animation. Other than 'swing' or 'linear' must be provided by plugin // default: 'swing' * sensitivity: Sensitivity threshold (must be 1 or higher) // default: 3 * interval: Milliseconds for onMouseOver polling interval // default: 100 * timeout: Milliseconds delay before onMouseOut // default: 300 * eventHandler: Event to open panels: click or hover. For the hover option requires hoverIntent plugin <http://cherne.net/brian/resources/jquery.hoverIntent.html> // default: 'click' * panelSelector: HTML element storing the panels // default: 'li' * activeClass: CSS class for the active panel // default: none * panelPositioning: Accordion panelPositioning: top -> first panel on the bottom and next on the top, other value -> first panel on the top and next to the bottom // default: 'top' * // Callback funtctions. Inside them, we can refer the panel with $(this). * onEnter: Funtion raised when the panel is activated. // default: none * onLeave: Funtion raised when the panel is deactivated. // default: none * * We can override the defaults with: * $.fn.hSlides.defaults.easing = 'easeOutCubic'; * * @param settings An object with configuration options * @author Jesus Carrera <[email protected]> */ (function($) { $.fn.hSlides = function(settings) { // override default configuration settings = $.extend({}, $.fn.hSlides.defaults, settings); // for each accordion return this.each(function(){ var wrapper = this; var panelLeft = 0; var panels = $(settings.panelSelector, wrapper); var panelPositioning = 1; if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).length - 1) * settings.minPanelWidth; panels = $(settings.panelSelector, wrapper).reverse(); panelPositioning = -1; } // necessary styles for the wrapper $(this).css('position', 'relative').css('overflow', 'hidden').css('width', settings.totalWidth).css('height', settings.totalHeight); // set the initial position of the panels var zIndex = 0; panels.each(function(){ // necessary styles for the panels $(this).css('position', 'absolute').css('left', panelLeft).css('zIndex', zIndex).css('height', settings.totalHeight).css('width', settings.maxPanelWidth); zIndex ++; // if this panel is the activated by default, set it as active and move the next (to show this one) if ($(this).hasClass(settings.activeClass)){ $.data($(this)[0], 'active', true); if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).index(this) + 1) * settings.minPanelWidth - settings.maxPanelWidth; }else{ panelLeft = panelLeft + settings.maxPanelWidth; } }else{ // check if we are centering and some panel is active // this is why we can't add/remove the active class in the callbacks: positioning the panels if we have one active if (settings.midPanelWidth && $(settings.panelSelector, wrapper).hasClass(settings.activeClass) == false){ panelLeft = panelLeft + settings.midPanelWidth * panelPositioning; }else{ panelLeft = panelLeft + settings.minPanelWidth * panelPositioning; } } }); // iterates through the panels setting the active and changing the position var movePanels = function(){ // index of the new active panel var activeIndex = $(settings.panelSelector, wrapper).index(this); // iterate all panels panels.each(function(){ // deactivate if is the active if ( $.data($(this)[0], 'active') == true ){ $.data($(this)[0], 'active', false); $(this).removeClass(settings.activeClass).each(settings.onLeave); } // set position of current panel var currentIndex = $(settings.panelSelector, wrapper).index(this); panelLeft = settings.minPanelWidth * currentIndex; // if the panel is next to the active, we need to add the opened width if ( (currentIndex * panelPositioning) > (activeIndex * panelPositioning)){ panelLeft = panelLeft + (settings.maxPanelWidth - settings.minPanelWidth) * panelPositioning; } // animate $(this).animate({left: panelLeft}, settings.speed, settings.easing); }); // activate the new active panel $.data($(this)[0], 'active', true); $(this).addClass(settings.activeClass).each(settings.onEnter); }; // center the panels if configured var centerPanels = function(){ var panelLeft = 0; if (settings.panelPositioning != 'top'){ panelLeft = ($(settings.panelSelector, wrapper).length - 1) * settings.minPanelWidth; } panels.each(function(){ $(this).removeClass(settings.activeClass).animate({left: panelLeft}, settings.speed, settings.easing); if ($.data($(this)[0], 'active') == true){ $.data($(this)[0], 'active', false); $(this).each(settings.onLeave); } panelLeft = panelLeft + settings.midPanelWidth * panelPositioning ; }); }; // event handling if(settings.eventHandler == 'click'){ $(settings.panelSelector, wrapper).click(movePanels); }else{ var configHoverPanel = { sensitivity: settings.sensitivity, interval: settings.interval, over: movePanels, timeout: settings.timeout, out: function() {} } var configHoverWrapper = { sensitivity: settings.sensitivity, interval: settings.interval, over: function() {}, timeout: settings.timeout, out: centerPanels } $(settings.panelSelector, wrapper).hoverIntent(configHoverPanel); if (settings.midPanelWidth != 0){ $(wrapper).hoverIntent(configHoverWrapper); } } }); }; // invert the order of the jQuery elements $.fn.reverse = function(){ return this.pushStack(this.get().reverse(), arguments); }; // default settings $.fn.hSlides.defaults = { totalWidth: 0, totalHeight: 0, minPanelWidth: 0, maxPanelWidth: 0, midPanelWidth: 0, speed: 500, easing: 'swing', sensitivity: 3, interval: 100, timeout: 300, eventHandler: 'click', panelSelector: 'li', activeClass: false, panelPositioning: 'top', onEnter: function() {}, onLeave: function() {} }; })(jQuery);

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  • importing content into drupal.

    - by anru
    I have a wordpress site with 5k post and each post has average 25 comments. so 125k total nodes have to be added. I need import those posts and comments into drupal 6 . I have written a script to import those post/comments into drupal by drupal's cron service. but the cron service keeps time out. because import 125k nodes one by one is very slow. what can i do to imporve drupal importing speed? i am use drupal built in node_save(), comment_save() method to do it. I have not find out a way to use customized SQL query to increase importing speed yet. I am execute my script through drupals's cron.php, that mean even i have set 'max_execute_time' to unlimited, but that only affects PHP , apache server has it own time out setting.

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  • jQuery ready function

    - by Darren Tarrant
    Can anyone tell me why the document ready function needs a call to function first please? I've been told that the setTimeout in the first below example (which does not work) would be evaluated and passed to ready, but I don't see what the difference would be for the function call in the second example (which works)? $(document).ready( setTimeout( function(){ $('#set_3').innerfade({ animationtype: 'fade', speed: 'slow', timeout: 3000, type: 'sequence', containerheight: '180' }); }, 2000); ); $(document).ready( function(){ setTimeout( function(){ $('#set_3').innerfade({ animationtype: 'fade', speed: 'slow', timeout: 3000, type: 'sequence', containerheight: '180' }); }, 2000); } );

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  • SQL Server - Query Short-Circuiting?

    - by Sam Schutte
    Do T-SQL queries in SQL Server support short-circuiting? For instance, I have a situation where I have two database and I'm comparing data between the two tables to match and copy some info across. In one table, the "ID" field will always have leading zeros (such as "000000001234"), and in the other table, the ID field may or may not have leading zeros (might be "000000001234" or "1234"). So my query to match the two is something like: select * from table1 where table1.ID LIKE '%1234' To speed things up, I'm thinking of adding an OR before the like that just says: table1.ID = table2.ID to handle the case where both ID's have the padded zeros and are equal. Will doing so speed up the query by matching items on the "=" and not evaluating the LIKE for every single row (will it short circuit and skip the LIKE)?

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  • What's a reliable and practical way to protect software with a user license ?

    - by Frank
    I know software companies use licenses to protect their softwares, but I also know there are keygen programs to bypass them. I'm a Java developer, if I put my program online for sale, what's a reliable and practical way to protect it ? How about something like this, would it work ? <1> I use ProGuard to protect the source code. <2> Sign the executable Jar file. <3> Since my Java program only need to work on PC [I need to use JDIC in it], I wrap the final executable Jar into an .exe file which makes it harder to decompile. <4> When a user first downloads and runs my app, it checks for a Pass file on his PC. <5> If the Pass file doesn't exist, run the app in demo mode, exits in 5 minutes. <6> When demo exits a panel opens with a "Buy Now" button. This demo mode repeats forever unless step <7> happens. <7> If user clicks the "Buy Now" button, he fills out a detailed form [name, phone, email ...], presses a "Verify Info" button to save the form to a Pass file, leaving license Key # field empty in this newly generated Pass file. <8> Pressing "Verify Info" button will take him to a html form pre-filled with his info to verify what he is buying, also hidden in the form's input filed is a license Key number. He can now press a "Pay Now" button to goto Paypal to finish the process. <9> The hidden license Key # will be passed to Paypal as product Id info and emailed to me. <10> After I got the payment and Paypal email, I'll add the license Key # to a valid license Key list, and put it on my site, only I know the url. The list is updated hourly. <11> Few hours later when the user runs the app again, it can find the Pass file on his PC, but the license Key # value is empty, so it goes to the valid list url to see if its license Key # is on the list, if so, write the license Key # into the Pass file, and the next time it starts again, it will find the valid license Key # and start in purchased mode without exiting in 5 minutes. <12> If it can't find its license Key # on the list from my url, run in demo mode. <13> In order to prevent a user from copying and using another paid user's valid Pass file, the license Key # is unique to each PC [I'm trying to find how], so a valid Pass file only works on one PC. Only after a user has paid will Paypal email me the valid license Key # with his payment. <14> The Id checking goes like this : Use the CPU ID : "CPU_01-02-ABC" for example, encrypt it to the result ID : "XeR5TY67rgf", and compare it to the list on my url, if "XeR5TY67rgf" is not on my valid user list, run in demo mode. If it exists write "XeR5TY67rgf" into the Pass File license field. In order to get a unique license Key, can I use his PC's CPU Id ? Or something unique and useful [ relatively less likely to change ]. If so let's say this CPU ID is "CPU_01-02-ABC", I can encrypt it to something like "XeR5TY67rgf", and pass it to Paypal as product Id in the hidden html form field, then I'll get it from Paypal's email notification, and add it to the valid license Key # list on the url. So, even if a hacker knows it uses CPU Id, he can't write it into the Pass file field, because only encrypted Ids are valid Ids. And only my program knows how to generate the encrypted Ids. And even if another hacker knows the encrypted Id is hidden in the html form input field, as long as it's not on my url list, it's still invalid. Can anyone find any flaw in the above system ? Is it practical ? And most importantly how do I get hold of this unique ID that can represent a user's PC ? Frank

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  • How can I test caching and cache busting?

    - by Nathan Long
    In PHP, I'm trying to steal a page from the Rails playbook (see 'Using Asset Timestamps' here): By default, Rails appends assets' timestamps to all asset paths. This allows you to set a cache-expiration date for the asset far into the future, but still be able to instantly invalidate it by simply updating the file (and hence updating the timestamp, which then updates the URL as the timestamp is part of that, which in turn busts the cache). It‘s the responsibility of the web server you use to set the far-future expiration date on cache assets that you need to take advantage of this feature. Here‘s an example for Apache: # Asset Expiration ExpiresActive On <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$"> ExpiresDefault "access plus 1 year" </FilesMatch> If you look at a the source for a Rails page, you'll see what they mean: the path to a stylesheet might be "/stylesheets/scaffold.css?1268228124", where the numbers at the end are the timestamp when the file was last updated. So it should work like this: The browser says 'give me this page' The server says 'here, and by the way, this stylesheet called scaffold.css?1268228124 can be cached for a year - it's not gonna change.' On reloads, the browser says 'I'm not asking for that css file, because my local copy is still good.' A month later, you edit and save the file, which changes the timestamp, which means that the file is no longer called scaffold.css?1268228124 because the numbers change. When the browser sees that, it says 'I've never seen that file! Give me a copy, please.' The cache is 'busted.' I think that's brilliant. So I wrote a function that spits out stylesheet and javascript tags with timestamps appended to the file names, and I configured Apache with the statement above. Now: how do I tell if the caching and cache busting are working? I'm checking my pages with two plugins for Firebug: Yslow and Google Page Speed. Both seem to say that my files are caching: "Add expires headers" in Yslow and "leverage browser caching" in Page Speed are both checked. But when I look at the Page Speed Activity, I see a lot of requests and waiting and no 'cache hits'. If I change my stylesheet and reload, I do see the change immediately. But I don't know if that's because the browser never cached in the first place or because the cache is busted. How can I tell?

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  • Referencing a x86 assembly in a 64bit one

    - by Jörg Battermann
    In one project we have a dependency on a legacy system and its .Net assembly which is delivered as a 'x86' and they do not provide a 'Any CPU' and/or 64bit one. Now the project itself juggles with lots of data and we hit the limitations we have with a forced x86 on the whole project due to that one assembly (if we used 64bit/any cpu it would raise a BadImageFormatException once that x86 is loaded on a 64bit machine). Now is there a (workaround)way to use a x86 assembly in a 64bit .net host app? That tiny dependency on that x86 assembly makes and keeps 99% of the project heavily limited.

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  • Is it too early to start designing for Task Parallel Library?

    - by Joe Erickson
    I have been following the development of the .NET Task Parallel Library (TPL) with great interest since Microsoft first announced it. There is no doubt in my mind that we will eventually take advantage of TPL. What I am questioning is whether it makes sense to start taking advantage of TPL when Visual Studio 2010 and .NET 4.0 are released, or whether it makes sense to wait a while longer. Why Start Now? The .NET 4.0 Task Parallel Library appears to be well designed and some relatively simple tests demonstrate that it works well on today's multi-core CPUs. I have been very interested in the potential advantages of using multiple lightweight threads to speed up our software since buying my first quad processor Dell Poweredge 6400 about seven years ago. Experiments at that time indicated that it was not worth the effort, which I attributed largely to the overhead of moving data between each CPU's cache (there was no shared cache back then) and RAM. Competitive advantage - some of our customers can never get enough performance and there is no doubt that we can build a faster product using TPL today. It sounds fun. Yes, I realize that some developers would rather poke themselves in the eye with a sharp stick, but we really enjoy maximizing performance. Why Wait? Are today's Intel Nehalem CPUs representative of where we are going as multi-core support matures? You can purchase a Nehalem CPU with 4 cores which share a single level 3 cache today, and most likely a 6 core CPU sharing a single level 3 cache by the time Visual Studio 2010 / .NET 4.0 are released. Obviously, the number of cores will go up over time, but what about the architecture? As the number of cores goes up, will they still share a cache? One issue with Nehalem is the fact that, even though there is a very fast interconnect between the cores, they have non-uniform memory access (NUMA) which can lead to lower performance and less predictable results. Will future multi-core architectures be able to do away with NUMA? Similarly, will the .NET Task Parallel Library change as it matures, requiring modifications to code to fully take advantage of it? Limitations Our core engine is 100% C# and has to run without full trust, so we are limited to using .NET APIs.

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  • Writing a search engine

    - by wvd
    Hello all, The title might be a bit misleading, but I couldn't figure out a better title. I'm writing a simple search engine which will search on several sites for the specific domain. To be concrete: I'm writing a search engine for hardstyle livesets/aftermovies/tracks. To do I will search on the sites who provide livesets, tracks, and such. The problem here is speed, I need to pass the search query to 5-7 sites, get the results and then use my own algorithm to display the results in a sorted order. I could just "multithread" it, but it's easier said then done so I have a few questions. What would be the best solution to this problem? Should I just multithread/process this application, so I'm going to get a bit of speed-up? Are there any other solutions or I am doing something really wrong? Thanks, William van Doorn

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  • Why Eventmachine Defer slower than Ruby Thread?

    - by allenwei
    I have two scripts which using mechanize to fetch google index page. I assuming Eventmachine will faster than ruby thread, but not. Eventmachine code cost "0.24s user 0.08s system 2% cpu 12.682 total" Ruby Thread code cost "0.22s user 0.08s system 5% cpu 5.167 total " Am I use eventmachine in wrong way? Who can explain it to me, thanks! 1 Eventmachine require 'rubygems' require 'mechanize' require 'eventmachine' trap("INT") {EM.stop} EM.run do num = 0 operation = proc { agent = Mechanize.new sleep 1 agent.get("http://google.com").body.to_s.size } callback = proc { |result| sleep 1 puts result num+=1 EM.stop if num == 9 } 10.times do EventMachine.defer operation, callback end end 2 Ruby Thread require 'rubygems' require 'mechanize' threads = [] 10.times do threads << Thread.new do agent = Mechanize.new sleep 1 puts agent.get("http://google.com").body.to_s.size sleep 1 end end threads.each do |aThread| aThread.join end

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  • jQuery Cycle plugin: One pager to control multiple slideshow on a page

    - by Michael
    Hi there, I have a cycle plugin set up on a page (images) with a pager to control the horizontal slide. My issue is that there is a transparent overlay that needs to sit over part of the images for some text relating to each image but would rather have that with a different transition effect for this so it doesn't slide in from the left. Am I able to set up to slideshows, each with 3 pieces of related content, that I can position correctly and have them controlled with the one pager? My script currently looks like this: $(function() { $('.s4').before('<div id="nav" class="nav">').cycle({ fx: 'fade', speed: 'slow', speedIn: 'slow', // speed of the 'in' transition speedOut: 'slow', timeout: 6000, pager: '#nav' }); }); I hope this makes sense, Thanks

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  • Adding an overlay to Google maps with path taken

    - by user341652
    Hi, I am trying to write a class to track a person's location(s), and to draw the path they've taken on a MapView. This feature of the program is for the user to track their speed, distance, path, etc. while running/cycling (or whatever else) using their Android phone. This is my first Android application, and I am not sure how to do the Overlay object for the MapView. I also wanted to see if anyone had opinions on the GPS-Tracking part I have written (if it would work, if there is a better way of doing it, code examples would be helpful). I currently have this for my GPSTrackerService: package org.drexel.itrain.logic; import java.util.Vector; import org.drexel.itrain.Constants; import android.app.Notification; import android.app.NotificationManager; import android.app.Service; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.location.GpsSatellite; import android.location.GpsStatus; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.location.GpsStatus.Listener; import android.os.Binder; import android.os.Bundle; import android.os.IBinder; import android.preference.PreferenceManager; public class GPSTrackingService extends Service { private static final int MAX_REASONABLE_SPEED = 60; private static final String TAG = "OGT.TrackingService"; private Context mContext; private LocationManager mLocationManager; private NotificationManager mNotificationManager; private Notification mNotification; private int mSatellites = 0; private int mTrackingState = Constants.GPS_TRACKING_UNKNOWN; private float mCurrentSpeed = 0; private float mTotalDistance = 0; private Location mPreviousLocation; private Vector<Location> mTrackedLocations; private LocationListener mLocationListener = null; private Listener mStatusListener = null; private IBinder binder = null; @Override public void onCreate() { super.onCreate(); this.mContext = getApplicationContext(); this.mLocationManager = (LocationManager) this.mContext.getSystemService( Context.LOCATION_SERVICE ); this.mNotificationManager = (NotificationManager) this.mContext.getSystemService( Context.NOTIFICATION_SERVICE ); this.mTrackedLocations = new Vector<Location>(); this.binder = new Binder(); SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this.mContext); binder = new Binder(); if(mTrackingState != Constants.GPS_TRACKING_UNKNOWN) { createListeners(); } } @Override public void onDestroy() { destroyListeneres(); } @Override public IBinder onBind(Intent intent) { return binder; } @Override public boolean onUnbind(Intent intent) { return true; } public boolean acceptLocation(Location proposedLocation) { if(!(proposedLocation.hasSpeed() || proposedLocation.hasAccuracy())) { return false; } else if(proposedLocation.getSpeed() >= MAX_REASONABLE_SPEED) { return false; } return true; } public void updateNotification() { //TODO Alert that no GPS sattelites are available (or are available) } public void startTracking() { this.mTrackingState = Constants.GPS_TRACKING_STARTED; this.mTotalDistance = 0; this.mCurrentSpeed = 0; this.mTrackedLocations = new Vector<Location>(); this.mPreviousLocation = null; createListeners(); } public void pauseTracking() { this.mTrackingState = Constants.GPS_TRACKING_PAUSED; this.mPreviousLocation = null; this.mCurrentSpeed = 0; } public void resumeTracking() { if(this.mTrackingState == Constants.GPS_TRACKING_STOPPED){ this.startTracking(); } this.mTrackingState = Constants.GPS_TRACKING_STARTED; } public void stopTracking() { this.mTrackingState = Constants.GPS_TRACKING_STOPPED; destroyListeneres(); } private void createListeners() { /** * LocationListener receives locations from */ this.mLocationListener = new LocationListener() { @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } @Override public void onProviderEnabled(String provider) { // TODO Auto-generated method stub } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub } @Override public void onLocationChanged(Location location) { if(mTrackingState == Constants.GPS_TRACKING_STARTED && acceptLocation(location)) { if(mPreviousLocation != null) { //Add the distance between the new location and the previous location mTotalDistance += mPreviousLocation.distanceTo(location); } if(location.hasSpeed()) { mCurrentSpeed = location.getSpeed(); } else { mCurrentSpeed = -1; //-1 means speed N/A } mPreviousLocation = location; mTrackedLocations.add(location); } } }; /** * Receives updates reguarding the GPS Status */ this.mStatusListener = new GpsStatus.Listener() { @Override public synchronized void onGpsStatusChanged(int event) { switch( event ) { case GpsStatus.GPS_EVENT_SATELLITE_STATUS: { GpsStatus status = mLocationManager.getGpsStatus( null ); mSatellites = 0; Iterable<GpsSatellite> list = status.getSatellites(); for( GpsSatellite satellite : list ) { if( satellite.usedInFix() ) { mSatellites++; } } updateNotification(); break; } default: break; } } }; } /** * Destroys the LocationListenere and the GPSStatusListener */ private void destroyListeneres() { this.mLocationListener = null; this.mStatusListener = null; } /** * Gets the total distance traveled by the * * @return the total distance traveled (in meters) */ public float getDistance() { return mTotalDistance; } /** * Gets the current speed of the last good location * * @return the current speed (in meters/second) */ public float getSpeed() { return mCurrentSpeed; } } Any assistance would be much appreciated. This is my group's first Android app, and we are a little pressed for time at the moment. The project is for a class, and is available from SourceForge (currently called iTrain, soon to be renamed). Thanks in Advance, Steve

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