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  • Best CPUs for speeding up compiling times of C++ w/ DistGCC

    - by Jay
    I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay

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  • Regex matching very slow

    - by Ali Lown
    I am trying to parse a PDF to extract the text from it (please don't suggest any libraries to do this, as this is part of learning the format). I have already handled deflating it to put it in the alphanumeric format. I now need to extract the text from the text blocks. So, my current pattern is "BT.*?((.*?)).*?ET" (with DOTMATCHALL set) to match something like: BT /F13 12 Tf 288 720 Td (ABC) Tj ET The only bit I want is the text ABC in the brackets. The above pattern works, but is really slow, I assume it is because the regex library is failing to match the pattern that matches the text between BT and the (ABC) many times. The regex is pre-compiled in an attempt to speed it up, but it seems negligible. How may I speed this up?

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  • In a multithreaded app, would a multi-core or multiprocessor arrangement be better?

    - by Michael
    I've read a lot on this topic already both here (e.g., stackoverflow.com/questions/1713554/threads-processes-vs-multithreading-multi-core-multiprocessor-how-they-are or http://stackoverflow.com/questions/680684/multi-cpu-multi-core-and-hyper-thread) and elsewhere (e.g., ixbtlabs.com/articles2/cpu/rmmt-l2-cache.html or software.intel.com/en-us/articles/multi-core-introduction/), but I still am not sure about a couple things that seem very straightforward. So I thought I'd just ask. (1) Is a multi-core processor in which each core has dedicated cache effectively the same as a multiprocessor system (balanced of course for processor speed, cache size, and so on)? (2) Let's say I have some images to analyze (i.e., computer vision), and I have these images loaded into RAM. My app spawns a thread for each image that needs to be analyzed. Will this app on a shared cache multi-core processor run slower than on a dedicated cache multi-core processor, and would the latter run at the same speed as on an equivalent single-core multiprocessor machine? Thank you for the help!

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  • Multiple rows with a single INSERT in SQLServer 2008

    - by Todd
    I am testing the speed of inserting multiple rows with a single INSERT statement. For example: INSERT INTO [MyTable] VALUES (5, 'dog'), (6, 'cat'), (3, 'fish) This is very fast until I pass 50 rows on a single statement, then the speed drops significantly. Inserting 10000 rows with batches of 50 take 0.9 seconds. Inserting 10000 rows with batches of 51 take 5.7 seconds. My question has two parts: Why is there such a hard performance drop at 50? Can I rely on this behavior and code my application to never send batches larger than 50? My tests were done in c++ and ADO.

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  • What are the real-world benefits of declarative-UI languages such as XAML and QML?

    - by Stu Mackellar
    I'm currently evaluating QtQuick (Qt User Interface Creation Kit) which will be released as part of Qt 4.7. QML is the JavaScript-based declarative language behind QtQuick. It seems to be a very powerful concept, but I'm wondering if anybody that's made extensive use of other, more mature declarative-UI languages like XAML in WPF or Silverlight can give any insight into the real-world benefits that can be gained from this style of programming. Various advantages are often cited: Speed of development Forces separation between presentation and logic Better integration between coders and designers UI changes don't require re-compilation Also, are there any downsides? A few potential areas of concern spring to mind: Execution speed Memory usage Added complexity Are there any other considerations that should be taken into account?

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  • can router configuration cause decreasing of download rate?

    - by Behrooz
    my download speed got crazy since i changed the routers IP. but nothing got fixed after "reset factory"ing it. the speed was 1024kb/s(128kB/s) but it is 200kb/s(max) right now. i mean it works good if a request is small(i.e. a HTTP request) but it gets slow if a request has a big response. help me please(it is three days I'm downloading VS2010) http://serverfault.com/questions/135243/ no one on serverfault helped me for posting my question please migrate it to serverfault. thanks.

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Core Animation performance on iphone

    - by nico
    I'm trying to do some animations using Core Animation on the iphone. I'm using CABasicAnimation on CALayer. It's a straight forward animation from a random place at the top of the screen to the bottom of the screen at random speed, I have 30 elements that doing the same animation continuously until another action happens. But the performance on the iPhone 3G is very sluggish when the animations start. The image is only 8k. Is this the right approach? How should I change so it performs better. // image cached somewhere else. CGImageRef imageRef = [[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:name ofType:@"png"]] CGImage]; - (void)animate:(NSTimer *)timer { int startX = round(radom() % 320); float speed = 1 / round(random() % 100 + 2); CALayer *layer = [CALayer layer]; layer.name = @"layer"; layer.contents = imageRef; // cached image layer.frame = CGRectMake(0, 0, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef)); int width = layer.frame.size.width; int height = layer.frame.size.height; layer.frame = CGRectMake(startX, self.view.frame.origin.y, width, height); [effectLayer addSublayer:layer]; CGPoint start = CGPointMake(startX, 0); CGPoint end = CGPointMake(startX, self.view.frame.size.height); float repeatCount = 1e100; CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"]; animation.delegate = self; animation.fromValue = [NSValue valueWithCGPoint:start]; animation.toValue = [NSValue valueWithCGPoint:end]; animation.duration = speed; animation.repeatCount = repeatCount; animation.autoreverses = NO; animation.removedOnCompletion = YES; animation.fillMode = kCAFillModeForwards; [layer addAnimation:animation forKey:@"position"]; } The animations are fired off using a NSTimer. animationTimer = [NSTimer timerWithTimeInterval:0.2 target:self selector:@selector(animate:) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:animationTimer forMode:NSDefaultRunLoopMode];

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  • Running Script before/after Variables declared?

    - by Sam
    Hi folks. As i understand javascript .js files are best to put all the way at the bottom of html pages, to speed up loading of rest of page. Advised by Yslow(Yahoo) and Page Speed(google). Now, when in the middle of page some thing RUNS a javascript script, in Internet Explorer, i see a small warning message saying that the element is: Uncaught ReferenceError: SWFObject is not defined When i put my all.js file in the had, the error goes away but page load slows doen. What to do? Actually, i remember it was the same with php variables. If i RUN php but the variable comes later, then it just doesnt work. must define the variable first, for it to run. How to make this workflow better, in case of php scripts? and in case of javsscripts? Thanks!

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