Comments on: Multithreaded Apache In Small VPS http://itkia.com/multithreaded-apache-in-small-vps/?utm_source=rss&utm_medium=rss&utm_campaign=multithreaded-apache-in-small-vps Applications, OS, Networking, Data Tue, 15 May 2012 23:05:26 +0000 hourly 1 http://wordpress.org/?v=3.3 By: IT Know-It-All http://itkia.com/multithreaded-apache-in-small-vps/comment-page-1/#comment-951 IT Know-It-All Sun, 25 Jul 2010 05:46:34 +0000 http://itkia.com/?p=57#comment-951 Good question. Looking at the <a href="http://httpd.apache.org/docs/2.1/mod/mpm_common.html#threadstacksize" rel="nofollow">Apache documentation for ThreadStackSize</a>, it says the directive "sets the size of the stack (for autodata) of threads which handle client connections and call modules to help process those connections." Since CGI and FastCGI are spawned external processes I would presume that ThreadStackSize would not affect them, although setting "ulimit -s" for Apache <strong>would</strong> probably inherit to the spawned processes since it is an environmental constraint where ThreadStackSize is an application control. Unfortunately the real answer is "I don't know." But other OS'es have small (64k-128k) stack sizes by default, and I haven't seen anyone say that they are a problem for PHP. If I wanted to test it, I would find a way to put more that 128k on the stack. Perhaps create a large data structure and try to pass it by value (as opposed to by reference) and see if there is a stack overflow error. Good question. Looking at the Apache documentation for ThreadStackSize, it says the directive “sets the size of the stack (for autodata) of threads which handle client connections and call modules to help process those connections.” Since CGI and FastCGI are spawned external processes I would presume that ThreadStackSize would not affect them, although setting “ulimit -s” for Apache would probably inherit to the spawned processes since it is an environmental constraint where ThreadStackSize is an application control.

Unfortunately the real answer is “I don’t know.” But other OS’es have small (64k-128k) stack sizes by default, and I haven’t seen anyone say that they are a problem for PHP. If I wanted to test it, I would find a way to put more that 128k on the stack. Perhaps create a large data structure and try to pass it by value (as opposed to by reference) and see if there is a stack overflow error.

]]> By: pulponair http://itkia.com/multithreaded-apache-in-small-vps/comment-page-1/#comment-934 pulponair Wed, 21 Jul 2010 13:29:07 +0000 http://itkia.com/?p=57#comment-934 Hmm i wonder if the apache stacklimit (if specified via ThreadStackSize) is inheritated to a single php5-cgi prozess. Do you know anything about how things work together? Hmm i wonder if the apache stacklimit (if specified via ThreadStackSize) is inheritated to a single php5-cgi prozess.

Do you know anything about how things work together?

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