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Performance tuning PHP on IBMi
 

Performance tuning PHP on IBMi

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This is the slide deck of the "Performance Tuning PHP on IBM i" given by Mike Pavlak and Alan Seiden in Feb 2012. They discuss some of the more fundamental areas that reveal performance bottlenecks. ...

This is the slide deck of the "Performance Tuning PHP on IBM i" given by Mike Pavlak and Alan Seiden in Feb 2012. They discuss some of the more fundamental areas that reveal performance bottlenecks. They explore hardware, software and configuration options that will help your PHP applications fly. The discussion reviews features for both Zend Server and Zend Server CE.
To watch the recording, visit http://bit.ly/A4NjYM

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    Performance tuning PHP on IBMi Performance tuning PHP on IBMi Presentation Transcript

    • Performance Tuning PHP on IBM iMike Pavlak Alan SeidenSolution Consultant Strategic Business SystemsWatch the recorded webinar: http://bit.ly/A4NjYM © All rights reserved. Zend Technologies, Inc.
    • Agenda • What affects performance • Zend Server configuration • Review hardware architecture • Explore Web specific opportunities • Where to get additional help • Wrap up • Q&A2 © All rights reserved. Zend Technologies, Inc.
    • Performance is in the eye of the beholder… Perception is reality Many pieces to the performance puzzle Rarely a single silver bullet Performance tuning is a journey, not a destination Learn as you go Commercial websites look great… • And can be great motivators for change PHP is often accused but rarely convicted3 © All rights reserved. Zend Technologies, Inc.
    • Major contributors to performance issues • Additive workload • Transitional workload • Organic growth • Network infrastructure • Entropy • A piece of advice… When you see these coming…GET IN FRONT OF THEM • Or get run over!4 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Speed = money• Google’s experiment Google Search lists 10 results per page They tested pages of 30 results • Traffic and revenue dropped by 20% • Why? – 10 results took .4 seconds to generate – 30 results took .9 seconds • A ½ second delay caused a 20% drop in traffic Source: http://glinden.blogspot.com/2006/11/marissa -mayer-at-web-20.html Performance Tuning PHP on IBM i | 5 © All rights reserved. Zend Technologies, Inc.
    • Speed = competitiveness• Search engine ranking Since early 2010, Google’s search algorithm has included speed Faster sites rank higher, all else being equal• Consumers lose patience with slow sites With many choices, users give up on sites that drag Patience has decreased since the 1990s• Slower sites often waste bandwidth and CPU Costly infrastructure driven by performance mistakesPerformance Tuning PHP on IBM i | 6 © All rights reserved. Zend Technologies, Inc.
    • How do we improve performance • Subject of this webinar Doing what you are doing now! • From the softer side Communication with other teams is essential • While it is encouraged to bang you head against the wall… • Do not suffer in silence, reach out for help Education • If you think education is expensive, try ignorance! Services • There are folks who may know more than you. Hire them.7 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Looking at Zend Server Administration © All rights reserved. Zend Technologies, Inc.
    • Zend Server for IBM i 5.6 • Zend Server is Home Base • Configuration options abound • We will look at FastCGI settings Logs Extensions9 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Fast CGI • Mechanism for communicating between Apache and PHP • Built in with 10 server jobs at the time of installation • This should conform to concurrent processes • Watch this as more workload is migrated to web10 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Fast CGI • Changing this is something that should be considered But not taken lightly (system resources, etc.) • File to edit: /www/zendsvr/conf/fastcgi.conf SetEnv="PHP_FCGI_CHILDREN=10" • But don’t forget… StartProcesses = “2” * PHP_FCGI_CHILDREN = 8 is 16 total worker jobs http://www.youngiprofessionals.com/wiki/FastCGI http://www.systeminetwork.com/article/other- languages/fastcgi-boosts-php-performance-on-ibm-i-6619511 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • PHP Logs • IFS performance, minimize read/writes Alan will discuss more But what about the logs • Consider the event monitor • Read the logs • Reduce the messages • Clip the log /usr/local/zendsvr/var/log/php.log12 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Rename the log • Zend Server will create more!  REN OBJ(/usr/local/zendsvr/var/log/php.log) NEWOBJ(phplog20120306.txt)13 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Extensions • PHP travels with a posse 70+ extensions Many are used every day But if not used, may be turned off… Default, • Zend Server for IBM i shipped with DB2 on and SQL Server off • Look at the Zend Server admin interface – Server setup  Extensions – Like a light switch14 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • IBM i administration • PTF’s Current cumulative & group for HTTP • Memory pools Isolate memory from other attacks • Workload partitioning With i6.1 & i7.1 can protect processor without LPAR • Understanding demands on the systems If the boss doesn’t believe you, have your BP back you up! Performance Monitor tools 3rd party15 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • WRKSYSSTS – The first place to go!!!16 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Tools © All rights reserved. Zend Technologies, Inc.
    • Firebug add-on graphs performance• Firebug https://addons.mozilla.org/firefox/addon/firebug/ Even better with FirePHP and Page SpeedPerformance Tuning PHP on IBM i | 18 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Use Compression © All rights reserved. Zend Technologies, Inc.
    • Compression reduces file size• Called gzip or mod_deflate (the same for our purposes)• Compresses, speeds up html, javascript, css, any text• Add two lines (OK, two long lines) to httpd.conf Apache config  LoadModule deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM  AddOutputFilterByType DEFLATE application/x-httpd-php application/json text/css application/x-javascript application/javascript text/htmlPerformance Tuning PHP on IBM i | 20 © All rights reserved. Zend Technologies, Inc.
    • Netflix saw improvement with gzip/deflate• Saw 13-25% performance improvement• Cut outbound traffic in half That saves money for a busy site such as Netflix• Details of Netflix improvement: http://www.slideshare.net/billwscott/improving-netflix- performance-experience• It really works!• Tutorial on my blog: http://www.alanseiden.com/2010/08/13/maximize-zend- server-performance-with-apache-compression/Performance Tuning PHP on IBM i | 21 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Reduce HTTP Requests © All rights reserved. Zend Technologies, Inc.
    • Requests cause “blocking” in browser• Browsers typically limit themselves to 2 parallel requests to a given server• File requests stack up, blocked by prev. requests•• Above, even “not modified” files caused blocking• Solution: reduce number of images or improve caching via “Expires” headers  http://httpd.apache.org/docs/2.0/mod/mod_expires.htmlPerformance Tuning PHP on IBM i | 23 © All rights reserved. Zend Technologies, Inc.
    • More ways to reduce “blocking”• If many .js or .css files are used: Combine them into fewer files Move contents of smaller .js or .css files inline to your pages, eliminating those external files Page Speed tool will help you decidePerformance Tuning PHP on IBM i | 24 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Ajax: friend or foe? © All rights reserved. Zend Technologies, Inc.
    • AJAX=Asynchronous Javascript And XML• AJAX updates parts of a page without reloading the whole page• Not always XML. These days, JSON too• Requests and file sizes are generally small• Meant to bring SPEED to the web• Potential problems if overusedPerformance Tuning PHP on IBM i | 26 © All rights reserved. Zend Technologies, Inc.
    • AJAX mistake #1• Too much of a good thing Requiring several AJAX requests to complete before the page itself can load fully Too many HTTP requests at once I’ve seen a situation where 4 AJAX requests were embedded in a page load • The AJAX doesn’t even start till the page loads • Causes “blocking” as the requests pile up, waiting for the previous ones to complete Solution: when page first loads, embed AJAX content right in the page • Re-use logic on the server side when building page • Subsequent updates can be done with AJAXPerformance Tuning PHP on IBM i | 27 © All rights reserved. Zend Technologies, Inc.
    • AJAX mistake #2• Duplicate requests Might go unnoticed with javascript library tools (Dojo, jQuery...) Happens more than you would expect! Common, actuallyPerformance Tuning PHP on IBM i | 28 © All rights reserved. Zend Technologies, Inc.
    • AJAX mistake #3 • Dynamically generating static content (don’t do that) • Solutions: Change to static files Cache URLs (e.g. with Zend Data Cache if using PHP, or Apache caching) See example below, before and after cachingPerformance Tuning PHP on IBM i | 29 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Keep-alive © All rights reserved. Zend Technologies, Inc.
    • Keep HTTP connections alive• “Keep-alive” setting in Apache (or any web server)• The HTTP job will stay open, waiting for you Perfect when downloading many images, css, js files• Configurable by number of seconds to keep connection open, number of files to be downloaded KeepAlive On KeepAliveTimeout 15 See http://httpd.apache.org/docs/2.0/mod/core.html#keepalive• Don’t overdo it—you are locking out other users from that HTTP job while it’s dedicated to youPerformance Tuning PHP on IBM i | 31 © All rights reserved. Zend Technologies, Inc.
    • Connecting takes time• Clues that Keepalive is off “Connection: close”, “Connecting”• Example bottom right: 3.6 seconds “Connecting” (longer than average but it really happened)Performance Tuning PHP on IBM i | 32 © All rights reserved. Zend Technologies, Inc.
    • What you see when Keep-alive is on• Firebug’s “Net” tab shows “Connection: Keep-Alive”, and, here, timeout=300 seconds (5 minutes) • Zero seconds to connect • Keep-alive is working!Performance Tuning PHP on IBM i | 33 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Persistent DB Connections © All rights reserved. Zend Technologies, Inc.
    • Persistence = connection pool• On IBM i, job initialization is relatively slow Gives us good things—auditing, logging, security Solution: a pool of pre-initialized jobs• Pre-started DB2 jobs save time Generally run in subsystem QSYSWRK, job name QSQSRVR These prestart jobs can be configured with CHGPJE command• In PHP, persistent connections reuse initialized jobs db2_pconnect() Dramatic speed boostPerformance Tuning PHP on IBM i | 35 © All rights reserved. Zend Technologies, Inc.
    • Use db2_pconnect() to connect persistently• resource db2_pconnect ( string $database , string $username , string $password [, array $options ] )• Persistent is much faster than non-persistent db2_pconnect can reuse connections, reducing the time needed to connect (after the first time) to almost zero• How db2_pconnect() reuses connections Connections defined by database, username, and password Tries to reuse an existing connection matching these 3 params db2_close() on a persistent connection does nothing db2_pclose() forces the conn to closePerformance Tuning PHP on IBM i | 36 © All rights reserved. Zend Technologies, Inc.
    • db2_pconnect() example with library list$database = MYDB;$user = MYUSER;$password = MYPASS;// set library list (works the same for connect or pconnect)$options = array(i5_naming => DB2_I5_NAMING_ON, i5_libl => MYLIB1 MYLIB2);$conn = db2_pconnect($database, $user, $password, $options);if ($conn) { echo "Connection succeeded.";} else { echo "Connection failed.";}// MYTABLE will be found, if in library MYLIB1 or MYLIB2$stmt=db2_exec($conn,"SELECT * FROM MYTABLE");Performance Tuning PHP on IBM i | 37 © All rights reserved. Zend Technologies, Inc.
    • Rules for using persistence• Because connections are shared when defined with an identical database, user, and password, please: Avoid unpredictable results by also specifying the same $options for these connections Promote sharing of jobs by minimizing the number of user profiles that you connect with • Each user profile creates a new set of database jobs • Each set of jobs consumes system resources• More information: “DB2 and PHP Best Practices on IBM i” at http://alanseiden.com/presentationsPerformance Tuning PHP on IBM i | 38 © All rights reserved. Zend Technologies, Inc.
    • New open source PHP IBM i toolkit• Ships with Zend Server 5.6+ PTFs and hotfixes on download page Many improvements since first release• Information and updates: Young i Professionals site • http://youngiprofessionals.com/wiki/XMLSERVICE Zend Forum for Q&A and tips • http://forums.zend.com/viewtopic.php?f=113&t=41648 • “PHP on IBM i”->”Zend Server for IBM i”->”New Toolkit”• Efficient: use single DB2 connection for SQL and Toolkit http://forums.zend.com/viewtopic.php?f=113&t=46688 Persistent connection is the fastestPerformance Tuning PHP on IBM i | 39 © All rights reserved. Zend Technologies, Inc.
    • Performance Tuning PHP on IBM iwww.zend.com Wrap it up © All rights reserved. Zend Technologies, Inc.
    • Help! • I’ve got PHP applications and not sure what to do? • Do your homework Read, learn, explore Talk in forums (Zend.com and midrange.com) • Zend Services Application Audit • Up to 50,000 lines of code • Review on site or off (knowledge transfer!) • Report summary & remediation available41 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Zend Performance Audit  Comprehensive Methodology  Detailed evaluation of your application and environment  Detailed analysis of performance patterns and behaviors  Provide report and improvements recommendations  Proven Success  Delivered to numerous Global 1000 companies  Accelerated performance across industries  Methodologies applied to hundreds of applications  Delivered by the PHP Company Experts  Unparalleled experience in PHP and Zend Server  Methodology developed by the architects of PHP  Utilizing Zend standard benchmarks42 Zend Professional Services © All rights reserved. Zend Technologies, Inc.
    • Zend Server features (Full version) • Event Monitor Become aware of issues before your users call • Code Tracing Black box flight recorder for PHP scripts • Caching Op-code (Alan discussed & available with CE) Data (Also available with CE) Page • Job Queue SBMJOB for PHP!!!43 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Webcasts • April 12 – Stored Procedures Part II (RPG, etc.) • May 2 – Additional Functions of DB2 with PHP on IBM i Your thoughts???44 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Events where you’ll find Zend… • User groups WMCPA (Lake Geneva, WI) Mar 20-22 (Mike & Alan) • http://wmcpa.org/ NEUGC (Boston, MA) April 2-4 • http://neugc.org/ Alan: March 29: COMMON webcast: more performance tips http://www.common.org/index.php/webcasts/upcoming-webcasts.html April 5: live online event with System i Network New PHP Toolkit for IBM i http://www.systeminetwork.com/events/upcoming-events In New York City? I host the NYC Zend Framework Meetup http://www.meetup.com/ZendFramework-NYCmetro/45 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Events where you’ll find Zend…(cont.) • Major venues RPG & DB2 Summit (Ft. Worth, TX) Mar 25-28 • http://www.systemideveloper.com/Summit/conferences.html COMMON Annual Meeting and Expo (Anaheim, CA) May 6-9 • http://www.common.org/index.php/annualmeeting.html COMMON Fall Conference (Columbus, OH) Sep 24-26 • http://www.common.org/index.php/fall-conference-and-expo.html46 Insert->Header & Footer © All rights reserved. Zend Technologies, Inc.
    • Contact | Get tipsAlan Seiden Strategic Business Systems, Inc,201-327-9400 17 S. Franklin Tpkaseiden@sbsusa.com Ramsey, NJ, 07446http://alanseiden.com Twitter: @alanseidenFree PHP/i tips by email:http://alanseiden.com/tipsPerformance Tuning PHP on IBM i | 47 © All rights reserved. Zend Technologies, Inc.
    • Q&A mike.p@zend.com aseiden@sbsusa.com Watch the recorded webinar: http://bit.ly/A4NjYM48 © All rights reserved. Zend Technologies, Inc.