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  • INSERT DELAYED on locked tables blocks PHP processes to continue

    - by sw0x2A
    Our webservers write some tracking information into a MySQL database (using INSERT DELAYED into MyISAM table). When a huge SELECT query is executed on this table or when it is locked for another reason, the webserver processes (with INSERT DELAYED) are waiting for the database and in some cases the MaxServer limit is reached in Apaches, so they will stop serving requests. We use INSERT DELAYED because The DELAYED option for the INSERT statement is a MySQL extension to standard SQL that is very useful if you have clients that cannot or need not wait for the INSERT to complete. This is a common situation when you use MySQL for logging and you also periodically run SELECT and UPDATE statements that take a long time to complete. Quote from MySQL documentation. I am wondering why the Apache processes are waiting for the INSERT DELAYED to finish. And what can I do to just send the data and forget about it. (Since this is logging data, I do not care if we lose some entries.) Even when the table is locked the PHP script should just go on and should not wait for an answer of MySQL. (We do not want to setup Master-slave for this table but we are thinking about move this data to some NoSQL database. But for now I would like to know why INSERT DELAYED is not working as expected.)

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  • NFS of NAS server blocks in cluster environment

    - by Zardoz
    In our department we have an Iomega NAS (px4-300d) connected to a Supermicro cluster with 5 nodes (12 cores per node). Each node mounts a share on that NAS by using NFS. Unfortunately after some time (several minutes) of permanent read/write operations (from all nodes) the NAS starts to block and a bit later freezes completely. We tried several options of the mount command, but nothing helped (async, intr, wsize, rsize). The NAS itself doesn't allow many options (better to say none). Do you have any recommendation how to integrate a NAS using NFS in a cluster environment?

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  • Mail Server on Google Apps, Hotmail Blocks

    - by detay
    My company provides private research tools (sites) for companies. Each site has its own domain name and users. These sites need to be able to send outbound mail for notifications such as password reminders. We started using Google Apps for this purpose, but lately we are having tremendous problems with mailing, especially to hotmail. I added the SPF record as required. Mxtoolbox says my domains are not in any blacklists. I was told to contact https://postmaster.live.com/snds/addnetwork.aspx and add my network. Given that I am using google's mail servers for sending mail, should I add their IP address for registering my domain? Or should I add my server's IP even though I am not hosting the mail server on it? Here's an example of a returned message; > Delivered-To: [email protected] Received: by 10.112.1.195 with SMTP > id 3csp62757lbo; > Mon, 10 Dec 2012 10:42:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; > d=gmail.com; s=20120113; > h=mime-version:from:to:x-failed-recipients:subject:message-id:date > :content-type; > bh=x41JiCH75hsonh+5c/kzwIs7R8u4Hum2u396lkV3g2w=; > b=v+bBPvufqfVkNz2UrnhyyoGj1Cuwf6x/yMj0IXJgH27uJU7TqBOvbwnNHf33sQ7B9T > uGzxwryC2fmxBh72cGz1spwWK348nUp6KK73MXKnF8mpc3nPQ8Ke+EQpSPeJdq/7oZvd > scZTGpy//IiGEUDU5bJ7YPqYXQRycY5N6AF5iI4mWWwbS4opybp3IKpDDktu11p/YEEO > Fj9wnSCx3nLMXB/XZgSjjmnaluGhYNdh3JFtz83Vmr50qXTG/TuIXlkirP73GfGvIt2S > 7sy8/YdEbZR92mYe9wucditYr7MOuyjyYrZYCg+weXeTZiJX1PfBVieD+kD9MnCairnP > rQeQ== Received: by 10.14.215.197 with SMTP id e45mr52766237eep.0.1355164974784; > Mon, 10 Dec 2012 10:42:54 -0800 (PST) MIME-Version: 1.0 Return-Path: <> Received: by 10.14.215.197 with SMTP id > e45mr65950764eep.0; Mon, 10 Dec 2012 10:42:54 -0800 (PST) From: Mail > Delivery Subsystem <[email protected]> To: > [email protected] X-Failed-Recipients: ********@hotmail.fr > Subject: Delivery Status Notification (Failure) Message-ID: > <[email protected]> Date: Mon, 10 Dec 2012 > 18:42:54 +0000 Content-Type: text/plain; charset=ISO-8859-1 > > Delivery to the following recipient failed permanently: > > *********@hotmail.fr > > Technical details of permanent failure: Message rejected. See > http://support.google.com/mail/bin/answer.py?answer=69585 for more > information. > > ----- Original message ----- > > Received: by 10.14.215.197 with SMTP id > e45mr52766228eep.0.1355164974700; > Mon, 10 Dec 2012 10:42:54 -0800 (PST) Return-Path: <[email protected]> Received: from WIN-1BBHFMJGUGS ([91.93.102.12]) > by mx.google.com with ESMTPS id l3sm26787704eem.14.2012.12.10.10.42.53 > (version=TLSv1/SSLv3 cipher=OTHER); > Mon, 10 Dec 2012 10:42:54 -0800 (PST) Message-ID: <[email protected]> MIME-Version: 1.0 > From: [email protected] To: *********@hotmail.fr Date: Mon, 10 Dec > 2012 10:42:54 -0800 (PST) Subject: Rejoignez-nous sur achbanlek.com > Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: > base64 > > ----- End of message -----

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  • Loading Magento child html outside of Magento

    - by Christian Thamer
    I am loading Magento blocks outside of Magento for certain parts of my site. I can do this successfully with something similar the following. require_once $docRoot.'/app/Mage.php'; umask(0); Mage::app('default'); ... $layout = Mage::getSingleton('core/layout'); $block = $layout->createBlock('Mage_Page_Block_Html_Header'); $block->setTemplate('page/html/header.phtml'); echo $block->renderView(); The problem is that if the block I am rending has child blocks(html) they are not included in the output. In the example above the file header.phtml contains the following call for child html that is missing from the output. ... <?php echo $this->getChildHtml('topLinks') ?> ...

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  • SSTP BPDU with bad TLV and macflap -- info please

    - by Adeodatus
    Hi All, I'm slowly locking down the network I've inherited and mac-flapping has been a problem in the past with customers doing all kinds of crazy things. Thats changing but I am now encountering this error: Dec 30 18:31:31 10.50.1.50 1565: 001567: Dec 30 18:31:30: %SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.f681 in vlan 1 is flapping between port Gi0/5 and port Gi0/48 Dec 30 18:43:28 10.50.1.50 1566: 001568: Dec 30 18:43:26: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on GigabitEthernet0/5 VLAN1. Dec 30 18:48:18 10.50.1.50 1567: 001569: .Dec 30 18:48:17: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on GigabitEthernet0/5 VLAN1. unfortunately, that mac address is the mac of our core router, the only link to the internet, on port gi0/48 On the other end of gi0/5, I have about 50 bridged customer machines connected through a series of managed and unmanaged L2 switches. Yes, on VLAN1 too ... like I said, working on changing this slowly. In the mean time, it has me quite baffled on how to deal with this and track down the customer or switch that is the problem. What else could be going on with these messages ... the bad TLV is a new one for me. Any ideas? Thank you and Happy New Year to you all!!

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  • Why is it a bad idea to use a customer email as the from address

    - by Crab Bucket
    I've got an application that emails users once they have filled in a form. It uses a [email protected] as a from address. The customer wants it to use the email from the form as the from address which could be anything. I have been told that this is a bad idea due to spoofing/blacklisting and spam. I feel really vague about the exact reason about why this is a bad idea particularly as i've got to try to counsel the client out of this. Can someone explain to me why this is a bad idea. Interestingly the client has used a gmail account as the from address as a demo which not only works fine but has enabled the application to start sending emails (it wouldn't do it before with an email which was [email protected]). Erm - what is going on. I'm told one thing and the opposite works. Sorry - i know this is basic but I could find anything on a google search. Largely I think because I'm having trouble even framing the question. EDIT Thank you everyone - great answers. Interestingly the server sending the email and the mail box that it is going to are both behind the same firewall so the client says they are unconcerned about spam. Oh well.

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  • Portable C Compiler (pcc) with GTK+ in Code::Blocks

    - by CMPITG
    I had some problems when trying to compile a GTK+ program with Portable C Compiler (pcc) using Code::Blocks in Windows. When I tried to build the default GTK+ project in Code::Blocks, I get these errors: -------------- Build: Debug in cb-temp2 --------------- Compiling: main.c C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 423: parameter 'glib_major_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: function declaration in bad context C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: parameter '__declspec' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 425: redeclaration of __declspec C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 425: parameter 'glib_micro_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: function declaration in bad context C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: parameter '__declspec' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 427: redeclaration of __declspec C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 427: parameter 'glib_binary_age' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 431: parameter 'glib_check_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 42: parameter 'g_atomic_int_exchange_and_add' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 44: parameter 'g_atomic_int_add' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 47: parameter 'g_atomic_int_compare_and_exchange' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 50: parameter 'g_atomic_pointer_compare_and_exchange' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 52: parameter 'g_atomic_int_get' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 54: parameter 'g_atomic_int_set' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 55: parameter 'g_atomic_pointer_get' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 57: parameter 'g_atomic_pointer_set' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 44: parameter 'g_thread_error_quark' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 50: parameter 'GThreadError' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 52: parameter 'GThreadFunc' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 60: parameter 'GThreadPriority' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 62: parameter 'GThread' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: invalid function definition C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: function illegal in structure or union C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: invalid function definition C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: function illegal in structure or union C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 67: cannot recover from earlier errors: goodbye! Process terminated with status 1 (0 minutes, 1 seconds) 0 errors, 0 warnings I have successfully compiled the same project with gcc and now I'm still not able to compile it with pcc. Does anyone know how to solve it?

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  • HTML Encoding Blocks - Invalid expression term ':'

    - by Jamie Dixon
    Hey everyone, I'm developing a new ASP.NET MVC 2.0 application and wanting to use the new ASP.NET 4 encoding blocks. My View code contains <%: Model.ActivityName %> however Visual Studio is reporting: Unexpected toke at the position of the : (colon). When I run the application I get the following compilation error: Compiler Error Message: CS1525: Invalid expression term ':' What am i missing? Cheers for any help/advice.

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  • Any software to auto generate doxygen comment blocks?

    - by Simone Margaritelli
    Hello, i'm developing a quite big C++ software and now (better late than neve :)) i've decided to document it in the doxy standards. There are plenty of classes, methods, functions, macros and so on therefore i'm searching for a software that would scan my source tree and insert doxy comment blocks on top of every "documentable item" to let me edit them later and add details such as methods description and so on. Some hint?

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  • Blocks and Yields in Ruby

    - by Matt
    I am trying to understand blocks and yields and how they work in Ruby. How is a yield used and most of the rails applications use yields in a weird way. Can someone explain to me or show me where to go to understand them.

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  • jQuery shifting blocks of content to top on click/toggle

    - by JEBR0
    I have blocks of content that are toggled on/off via jQuery and I want to have the most recent one clicked to shuffle to the top of the content area. There are 4 that can be enabled and if you do it in a random order, or even intended order, it is hard to tell which one you just opened if it's not in the view window. Here is the page for reference http://jonrcoulter.com/

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  • Add 'x' 30 mins blocks to time string (javascript)

    - by Mikey1980
    I have a 24 hour time string (ie 16:30) and would like to add x time blocks of 30 mins. For example if x = 4, then 16:30 + 4(30) = 18:30. Is there any easy way to do this with out exploding the string and doing if statements for mins/hours.. etc? Also this is on a php page would it be easier to do this in php then echo it to the javascript? Thanks for the help!

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  • How to create layout for tower made of blocks

    - by sasquatch90
    I have a tower built from blocks like this : Whole Tower is an array of Towers. Each Tower contains Box[] array containing single Box'es.What layout should I use for this and can you give me any tips on how to create it ? Would it be easier if I would create Grid[][] containing Box'es? But I guess I can't store Box object inside Grid array. I'm just totally confused :/

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  • try .. catch blocks - when to use

    - by Konrad
    I have always been of the belief that if a method can throw an exception then it is reckless not to protect this call with a meaningful try block. I just posted 'You should ALWAYS wrap calls that can throw in try, catch blocks.' to this question and was told that it was 'remarkably bad advice' - I'd like to understand why. Thanks!

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  • Finding open contiguous blocks of time for every day of a month, fast

    - by Chris
    I am working on a booking availability system for a group of several venues, and am having a hard time generating the availability of time blocks for days in a given month. This is happening server-side in PHP, but the concept itself is language agnostic -- I could be doing this in JS or anything else. Given a venue_id, month, and year (6/2012 for example), I have a list of all events occurring in that range at that venue, represented as unix timestamps start and end. This data comes from the database. I need to establish what, if any, contiguous block of time of a minimum length (different per venue) exist on each day. For example, on 6/1 I have an event between 2:00pm and 7:00pm. The minimum time is 5 hours, so there's a block open there from 9am - 2pm and another between 7pm and 12pm. This would continue for the 2nd, 3rd, etc... every day of June. Some (most) of the days have nothing happening at all, some have 1 - 3 events. The solution I came up with works, but it also takes waaaay too long to generate the data. Basically, I loop every day of the month and create an array of timestamps for each 15 minutes of that day. Then, I loop the time spans of events from that day by 15 minutes, marking any "taken" timeslot as false. Remaining, I have an array that contains timestamp of free time vs. taken time: //one day's array after processing through loops (not real timestamps) array( 12345678=>12345678, // <--- avail 12345878=>12345878, 12346078=>12346078, 12346278=>false, // <--- not avail 12346478=>false, 12346678=>false, 12346878=>false, 12347078=>12347078, // <--- avail 12347278=>12347278 ) Now I would need to loop THIS array to find continuous time blocks, then check to see if they are long enough (each venue has a minimum), and if so then establish the descriptive text for their start and end (i.e. 9am - 2pm). WHEW! By the time all this looping is done, the user has grown bored and wandered off to Youtube to watch videos of puppies; it takes ages to so examine 30 or so days. Is there a faster way to solve this issue? To summarize the problem, given time ranges t1 and t2 on day d, how can I determine the remaining time left in d that is longer than the minimum time block m. This data is assembled on demand via AJAX as the user moves between calendar months. Results are cached per-page-load, so if the user goes to July a second time, the data that was generated the first time would be reused. Any other details that would help, let me know. Edit Per request, the database structure (or the part that is relevant here) *events* id (bigint) title (varchar) *event_times* id (bigint) event_id (bigint) venue_id (bigint) start (bigint) end (bigint) *venues* id (bigint) name (varchar) min_block (int) min_start (varchar) max_start (varchar)

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  • How to creating code highlighted blocks on your website

    - by Saif Bechan
    I have written a small PHP framework and I want to make a website where I explain some basic features. I want to display blocks of php code. Is there an easy to do this, preferably without JavaScript. I want to have section kind of like displayed below: // This function takes in a value and return it public function getname($name){ return $name; }

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  • Rotating blocks in JavaScript.

    - by Alvin SMith
    I'd like to create a JavaScript web app that makes blocks appear on the page that can be dragged around by the user. If I used DIVs with background colors, it would be easy to rotate them by 90 degrees at a time. However, if I wanted to rotate them arbitrarily, how could I accomplish this? I'd rather not have to resort to Flash, images, or HTML5.

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  • Passing data between blocks using sinatra

    - by Dan Galipo
    Hi All I'm trying to pass data between blocks using sinatra. For example: @data = Hash.new post "/" do @data[:test] = params.fetch("test").to_s redirect "/tmp" end get "/tmp" do puts @data[:test] end However whenever i get to the tmp block @data is nil and throws an error. Why is that?

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  • Why there are no semicolons and {} blocks in some languages

    - by Incognito
    I know the question has no practical value, but it is interesting why in some languages semicolons and {} blocks are removed although their predecessor have them. Actually it makes me nervous to write a code in Python as there are no ";" and {}. Also in new language Google-GO semicolons are also missing although it says that lexer uses a rule to insert semicolons automatically as it scans. So is there any secret :) reason for this.

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  • Essbase BSO Data Fragmentation

    - by Ann Donahue
    Essbase BSO Data Fragmentation Data fragmentation naturally occurs in Essbase Block Storage (BSO) databases where there are a lot of end user data updates, incremental data loads, many lock and send, and/or many calculations executed.  If an Essbase database starts to experience performance slow-downs, this is an indication that there may be too much fragmentation.  See Chapter 54 Improving Essbase Performance in the Essbase DBA Guide for more details on measuring and eliminating fragmentation: http://docs.oracle.com/cd/E17236_01/epm.1112/esb_dbag/daprcset.html Fragmentation is likely to occur in the following situations: Read/write databases that users are constantly updating data Databases that execute calculations around the clock Databases that frequently update and recalculate dense members Data loads that are poorly designed Databases that contain a significant number of Dynamic Calc and Store members Databases that use an isolation level of uncommitted access with commit block set to zero There are two types of data block fragmentation Free space tracking, which is measured using the Average Fragmentation Quotient statistic. Block order on disk, which is measured using the Average Cluster Ratio statistic. Average Fragmentation Quotient The Average Fragmentation Quotient ratio measures free space in a given database.  As you update and calculate data, empty spaces occur when a block can no longer fit in its original space and will either append at the end of the file or fit in another empty space that is large enough.  These empty spaces take up space in the .PAG files.  The higher the number the more empty spaces you have, therefore, the bigger the .PAG file and the longer it takes to traverse through the .PAG file to get to a particular record.  An Average Fragmentation Quotient value of 3.174765 means the database is 3% fragmented with free space. Average Cluster Ratio Average Cluster Ratio describes the order the blocks actually exist in the database. An Average Cluster Ratio number of 1 means all the blocks are ordered in the correct sequence in the order of the Outline.  As you load data and calculate data blocks, the sequence can start to be out of order.  This is because when you write to a block it may not be able to place back in the exact same spot in the database that it existed before.  The lower this number the more out of order it becomes and the more it affects performance.  An Average Cluster Ratio value of 1 means no fragmentation.  Any value lower than 1 i.e. 0.01032828 means the data blocks are getting further out of order from the outline order. Eliminating Data Block Fragmentation Both types of data block fragmentation can be removed by doing a dense restructure or export/clear/import of the data.  There are two types of dense restructure: 1. Implicit Restructures Implicit dense restructure happens when outline changes are done using EAS Outline Editor or Dimension Build. Essbase restructures create new .PAG files restructuring the data blocks in the .PAG files. When Essbase restructures the data blocks, it regenerates the index automatically so that index entries point to the new data blocks. Empty blocks are NOT removed with implicit restructures. 2. Explicit Restructures Explicit dense restructure happens when a manual initiation of the database restructure is executed. An explicit dense restructure is a full restructure which comprises of a dense restructure as outlined above plus the removal of empty blocks Empty Blocks vs. Fragmentation The existence of empty blocks is not considered fragmentation.  Empty blocks can be created through calc scripts or formulas.  An empty block will add to an existing database block count and will be included in the block counts of the database properties.  There are no statistics for empty blocks.  The only way to determine if empty blocks exist in an Essbase database is to record your current block count, export the entire database, clear the database then import the exported data.  If the block count decreased, the difference is the number of empty blocks that had existed in the database.

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  • php-fpm + persistent sockets = 502 bad gateway

    - by leeoniya
    Put on your reading glasses - this will be a long-ish one. First, what I'm doing. I'm building a web-app interface for some particularly slow tcp devices. Opening a socket to them takes 200ms and an fwrite/fread cycle takes another 300ms. To reduce the need for both of these actions on each request, I'm opening a persistent tcp socket which reduces the response time by the aforementioned 200ms. I was hoping PHP-FPM would share the persistent connections between requests from different clients (and indeed it does!), but there are some issues which I havent been able to resolve after 2 days of interneting, reading logs and modifying settings. I have somewhat narrowed it down though. Setup: Ubuntu 13.04 x64 Server (fully updated) on Linode PHP 5.5.0-6~raring+1 (fpm-fcgi) nginx/1.5.2 Relevent config: nginx worker_processes 4; php-fpm/pool.d pm = dynamic pm.max_children = 2 pm.start_servers = 2 pm.min_spare_servers = 2 Let's go from coarse to fine detail of what happens. After a fresh start I have 4x nginx processes and 2x php5-fpm processes waiting to handle requests. Then I send requests every couple seconds to the script. The first take a while to open the socket connection and returns with the data in about 500ms, the second returns data in 300ms (yay it's re-using the socket), the third also succeeds in about 300ms, the fourth request = 502 Bad Gateway, same with the 5th. Sixth request once again returns data, except now it took 500ms again. The process repeats for several cycles after which every 4 requests result in 2x 502 Bad Gateways and 2x 500ms Data responses. If I double all the fpm pool values and have 4x php-fpm processes running, the cycles settles in with 4x successful 500ms responses followed by 4x Bad Gateway errors. If I don't use persistent sockets, this issue goes away but then every request is 500ms. What I suspect is happening is the persistent socket keeps each php-fpm process from idling and ties it up, so the next one gets chosen until none are left and as they error out, maybe they are restarted and become available on the next round-robin loop ut the socket dies with the process. I haven't yet checked the 'slowlog', but the nginx error log shows lots of this: *188 recv() failed (104: Connection reset by peer) while reading response header from upstream, client:... All the suggestions on the internet regarding fixing nginx/php-fpm/502 bad gateway relate to high load or fcgi_pass misconfiguration. This is not the case here. Increasing buffers/sizes, changing timeouts, switching from unix socket to tcp socket for fcgi_pass, upping connection limits on the system....none of this stuff applies here. I've had some other success with setting pm = ondemand rather than dynamic, but as soon as the initial fpm-process gets killed off after idling, the persistent socket is gone for all subsequent php-fpm spawns. For the php script, I'm using stream_socket_client() with a STREAM_CLIENT_PERSISTENT flag. A while/stream_select() loop to detect socket data and fread($sock, 4096) to grab the data. I don't call fclose() obviously. If anyone has some additional questions or advice on how to get a persistent socket without tying up the php-fpm processes beyond the request completion, or maybe some other things to try, I'd appreciate it. some useful links: Nginx + php-fpm - recv() error Nginx + php-fpm "504 Gateway Time-out" error with almost zero load (on a test-server) Nginx + PHP-FPM "error 104 Connection reset by peer" causes occasional duplicate posts http://www.linuxquestions.org/questions/programming-9/php-pfsockopen-552084/ http://stackoverflow.com/questions/14268018/concurrent-use-of-a-persistent-php-socket http://devzone.zend.com/303/extension-writing-part-i-introduction-to-php-and-zend/#Heading3 http://stackoverflow.com/questions/242316/how-to-keep-a-php-stream-socket-alive http://php.net/manual/en/install.fpm.configuration.php https://www.google.com/search?q=recv%28%29+failed+%28104:+Connection+reset+by+peer%29+while+reading+response+header+from+upstream+%22502%22&ei=mC1XUrm7F4WQyAHbv4H4AQ&start=10&sa=N&biw=1920&bih=953&dpr=1

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  • Fix bad superblock on logical partition

    - by Chris
    I was following http://www.howtoforge.com/linux_resi...xt3_partitions and when i reboot and run: root@Microknoppix:/home/knoppix# fsck -n /dev/sda7 fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) fsck.ext2: Superblock invalid, trying backup blocks... fsck.ext2: Bad magic number in super-block while trying to open /dev/sda7 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> so i ran e2fsck with all the block numbers that you need (forget exactly what tool i used to find where the superblocks are hidden) no dice then i ran testdisk and had it look for the superblock, no results anyone have any ideas? fdisk -l for reference: root@Microknoppix:/home/knoppix# fdisk -l Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x97646c29 Device Boot Start End Blocks Id System /dev/sda1 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 38912 312046593 f W95 Ext'd (LBA) /dev/sda5 64 326 2104320 82 Linux swap / Solaris /dev/sda6 * 327 2938 20972544 83 Linux /dev/sda7 2938 38912 288968672+ 83 Linux To be honest it looks like I lost it... Next step if that happens is to dump the partition to an image file and hope i can find or write some software to parse through the data looking for known file headers, i think.

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  • Bad performance with Linux software RAID5 and LUKS encryption

    - by Philipp Wendler
    I have set up a Linux software RAID5 on three hard drives and want to encrypt it with cryptsetup/LUKS. My tests showed that the encryption leads to a massive performance decrease that I cannot explain. The RAID5 is able to write 187 MB/s [1] without encryption. With encryption on top of it, write speed is down to about 40 MB/s. The RAID has a chunk size of 512K and a write intent bitmap. I used -c aes-xts-plain -s 512 --align-payload=2048 as the parameters for cryptsetup luksFormat, so the payload should be aligned to 2048 blocks of 512 bytes (i.e., 1MB). cryptsetup luksDump shows a payload offset of 4096. So I think the alignment is correct and fits to the RAID chunk size. The CPU is not the bottleneck, as it has hardware support for AES (aesni_intel). If I write on another drive (an SSD with LVM) that is also encrypted, I do have a write speed of 150 MB/s. top shows that the CPU usage is indeed very low, only the RAID5 xor takes 14%. I also tried putting a filesystem (ext4) directly on the unencrypted RAID so see if the layering is problem. The filesystem decreases the performance a little bit as expected, but by far not that much (write speed varying, but 100 MB/s). Summary: Disks + RAID5: good Disks + RAID5 + ext4: good Disks + RAID5 + encryption: bad SSD + encryption + LVM + ext4: good The read performance is not affected by the encryption, it is 207 MB/s without and 205 MB/s with encryption (also showing that CPU power is not the problem). What can I do to improve the write performance of the encrypted RAID? [1] All speed measurements were done with several runs of dd if=/dev/zero of=DEV bs=100M count=100 (i.e., writing 10G in blocks of 100M). Edit: If this helps: I'm using Ubuntu 11.04 64bit with Linux 2.6.38. Edit2: The performance stays approximately the same if I pass a block size of 4KB, 1MB or 10MB to dd.

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