Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Application Diagnosis with Zend Server Tracing


Published on

Talk by Kevin Schroeder of Zend at ZendCon 2009

Published in: Technology
  • ⇒⇒⇒ ⇐⇐⇐ I love this site. It always finds me the best tutors in accordance with my needs. I have been using it since last year. The prices are not expensive compared to other sites. I am glad I discored this site:)
    Are you sure you want to  Yes  No
    Your message goes here
  • Yes you are right. There are many research paper writing services available now. But almost services are fake and illegal. Only a genuine service will treat their customer with quality research papers. ⇒ ⇐
    Are you sure you want to  Yes  No
    Your message goes here
  • Follow the link, new dating source: ♥♥♥ ♥♥♥
    Are you sure you want to  Yes  No
    Your message goes here
  • Sex in your area is here: ❶❶❶ ❶❶❶
    Are you sure you want to  Yes  No
    Your message goes here

Application Diagnosis with Zend Server Tracing

  1. 1. Application Diagnosis with Zend Server Tracing<br />Kevin Schroeder<br />Zend Technologies<br />
  2. 2. About me<br />Kevin Schroeder<br />Consultant for Zend<br />Programmer<br />Sys Admin<br />Author<br />Etc.<br />Me!<br />
  3. 3. &quot;As soon as we started programming, we found to our surprise that it wasn&apos;t as easy to get programs right as we had thought. Debugging had to be discovered. I can remember the exact instant when I realized that a large part of my life from then on was going to spent in finding mistakes in my own programs&quot; <br /> - Maurice Wilkes, 1949 <br />
  4. 4. Why do we need diagnostic tools?<br />
  5. 5. Let’s see that again in slow motion<br />
  6. 6. The point<br />NOT to highlight an individual company<br />Why not?<br />How many web-based applications look like this when an error occurs?<br />Answer<br />All of them<br />Web requests are intended to be short and quick<br />If an error occurs, recover, quit and go on to the next request<br />
  7. 7. Debugging the old way<br />var_dump($var)(I still use this occasionally)<br />Some obvious problems<br />What if you forget to remove it?<br />Are you doing this in a production environment? If you are …<br />Very limited scope<br />
  8. 8. Debugging the better way – ZS Debugging<br />You can see what the variable values are at run time and modify them too<br />Good for development<br />Not good for production<br />
  9. 9. Monitoring<br />MUCH better for production systems<br />You get a lot of really good information to help replay the issue<br />
  10. 10. Monitoring<br />You are able to debug or profile the event on a remote machine<br />
  11. 11. Events that can be monitored<br />
  12. 12. Instrumentation on the next level<br />Zend Code Tracing<br />
  13. 13. Code Tracing: Rapid Problem Resolution<br />Similar in concept to a black box flight recorder - Eliminates the need to reproduce problems in order to find root cause<br />Activated automatically (through rules) or manually<br />Records live application execution <br />Function calls<br />Arguments and return values<br />Errors<br />Duration<br />Useful in all parts of the software development lifecycle<br />
  14. 14. Practical Code Tracing Functionality<br />By capturing PHP applications code in real time:<br />Code Tracing enables to capture problems when they occur.<br />Code Tracing recorded data eliminate the need to reproduce the steps led up to a failure.<br />Code Tracing enables to analyze PHP applications execution both in production and in test lab environments, by that, it enables to quickly find the root cause of problems.<br />14<br />Insert-&gt;Header & Footer<br />
  15. 15. Supported Workflows<br />Manual workflow: <br />Used while performing unit tests during development or when running functional tests in QA. <br />Calling URLs as part of the testing process<br />Monitoring events workflow<br />Used when running automated tests and load tests and when running your application in staging or production environments. <br />Code tracing extends the monitoring rules mechanism by enabling to save trace data when a monitoring event is generated. <br />Suitable for production in Standby mode<br />
  16. 16. Detailed Runtime Instrumentation<br />Pinpoint root cause by viewing the sequence of events that led up to an error<br />
  17. 17. Detailed Runtime Instrumentation<br />Optimize your code by analyzing application performance at the function level<br />
  18. 18. Code Tracing – Monitoring Level Modes<br />Always on<br />Collects trace data when monitoring event is kicked off<br />Collects trace data for manual requests.<br />Inactive<br />Collects data only for manual requests.<br />Standby<br />Off (turn code tracing extension off)<br />
  19. 19. Code Tracing – Operating Modes<br />Standby mode<br />A monitoring event activates code tracing<br />Trace mode:<br />On<br />Standby<br />Tracing switches back for “Standby” mode<br />Tracing is activated for X minutes<br />Time<br />A monitoring event with an “Activate Trace” action is generated<br />Collect trace data according to the monitoring set of rules<br />
  20. 20. The basics<br />Trace a Request<br />
  21. 21. Interpreting the results<br />Screenshots are boring. Let’s look at live data<br />
  22. 22. Setup<br />Attaching traces to events <br />Tracing can be attached to any PHP-specific events<br />
  23. 23. Tracing Events – Standby Mode<br />Set zend_monitor.event_tracing_mode<br />Active, Inactive or Standby<br />Determines integration with tracer mechanism in case of events that require a trace data dump<br /><ul><li>Create an Event Action – “Enable Tracing” will change</li></li></ul><li>Tracing Process Signals<br />Tracing can also be initiated upon a fatal signal<br />
  24. 24. Tracing Log<br />Step 1 – Make sure that you have it set to log<br />Step 2 – Set the verbosity between 1 and 5<br />Restart<br />
  25. 25. Example log file<br />[Tracing Log 08.10.2009 14:14:56 DBG1] 5387 Tracer request startup <br />[Tracing Log 08.10.2009 14:14:56 DBG3] 5387 Setting dump reason to 0 <br />[Tracing Log 08.10.2009 14:14:56 DBG3] 5387 Dump reason is now 0 <br />[Tracing Log 08.10.2009 14:14:56 DBG1] 5387 Remote address is <br />[Tracing Log 08.10.2009 14:14:56 DBG2] 5387 Allow hostmask is,,, <br />[Tracing Log 08.10.2009 14:14:56 DBG2] 5387 Deny hostmask is <br />[Tracing Log 08.10.2009 14:14:56 DBG1] 5387 Remote access allowed <br />[Tracing Log 08.10.2009 14:14:56 DBG1] 5387 Request parameter requires dump <br />[Tracing Log 08.10.2009 14:14:56 DBG3] 5387 Setting dump reason to 2 <br />[Tracing Log 08.10.2009 14:14:56 NOTICE] 5387 Installing signal handler <br />[Tracing Log 08.10.2009 14:14:56 DBG2] 5387 Staring trace generation <br />[Tracing Log 08.10.2009 14:14:56 DBG2] 5387 Tracer request startup done <br />[Tracing Log 08.10.2009 14:14:56 DBG3] 5387 Options updated to 7FFF <br />[Tracing Log 08.10.2009 14:14:57 DBG1] 5387 Tracer request shutdown <br />[Tracing Log 08.10.2009 14:14:57 WARNING] 5387 Code tracing buffer full <br />[Tracing Log 08.10.2009 14:14:57 DBG1] Using socket /usr/local/zend/tmp/monitor_events.sock rules /usr/local/zend/etc/events_rules.xml <br />[Tracing Log 08.10.2009 14:14:58 NOTICE] Event type 1 (0) reported <br />[Tracing Log 08.10.2009 14:14:58 NOTICE] 5387 Generating trace dump, format 2 <br />[Tracing Log 08.10.2009 14:14:58 DBG2] 5387 Dump name is /usr/local/zend/var/codetracing/dump.5387.1 <br />Monitoring Event was triggered<br />
  26. 26. Functional Examples<br />Uncaught exceptions<br />Destructor being called<br />Prepared Statements<br />
  27. 27. Where did all my memory go?<br />Memory usage<br />Large variable going out of scope<br />
  28. 28. Impact<br />
  29. 29. The all-important question…<br />“Where should I use this?”<br />Development – Possibly, though profiling and debugging may be more pertinent<br />Testing – Absolutely<br />Staging – Absolutely<br />Production - Absolutely<br />In Standby mode<br />Activated on a subset of servers<br />
  30. 30. Questions?<br />Want to join in the public beta? Go to <br /><br />for more information<br /><br />
  31. 31. Additional Information<br />
  32. 32. What happens when you have too much data<br />Need to up the zend_codetracing.buffer_size setting<br />
  33. 33. Increasing the buffer size to 5MB<br />That’s better<br />
  34. 34. Settings<br />
  35. 35. Settings<br />
  36. 36. Settings<br />
  37. 37. Settings<br />