Question

We have an old facebook app, running smoothly written in native php.

This month we decided to rewrite it in zend-framework 2. Yesterday, after switching to new app it crashed our server with lots of out of memory errors. So we turned back to old app.

I installed xdebug to profile the app. Using memory_get_peak_usage() function i noticed high memory usage.

In the old app, a static page uses only 1 mb memory. But the new one using 7-8 mb approximately on the same page.

Here’s the top two rows from webgrind:

   Function                                     Invocation Count    Total Self Cost    Total Inclusive Cost
   Composer\Autoload\ClassLoader->loadClass     224                 23.31       47.20
   Composer\Autoload\ClassLoader->findFile      224                 9.57        10.23

Also tried tha apache’s ab tool

   ab -n 50 -c 5 -C PHPSESSID=SESSIONID http://myhost.com

Result is:

   Percentage of the requests served within a certain time (ms)
   50%    368
   66%    506
   75%    601
   80%    666
   90%   1073
   95%   1812
   98%   2278
   99%   2278
   100%   2278 (longest request)

All these results from the production server not localhost.

Is 7-8 mb for a single page normal? If not, how can i reduce it? Should i look for it in zf2 or composer?

I can give code samples if you need. Thank you.

Answer 1

I spent a day to figure out problem. Tried xdebug, xhprof. There was no problem in the code.

We switched back to 2.0.0 and problem solved. I don’t know what is wrong with new versions, for now stick with the 2.0.0.

Overall memory usage is around 4mb, no crashes.

composer.json:

"zendframework/zendframework": "2.0.0",