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From le...@netcourrier.com
Subject Re: [users@httpd] Strange apache behaviour when lauching an externalbinary called by a perl script
Date Fri, 22 Nov 2013 09:05:55 GMT
This issue is now resolved: my fortran binary handles very large arrays and complex functions
requiring an unlimited stack size. 

Despite that the stack size limit was defined on a system-wide basis (in /etc/security/limits.conf),
for any reason it appears that the "apache/perl/fortran binary" ensemble was not aware of
that (causing my binary to crash each time it was called). At the contrary, when I manually
restarted apache at the shell prompt, the stacksize limit was correctly passed (.bashrc with
'ulimit -S -s unlimited').

As a workaround, I used BSD::Resource module (http://search.cpan.org/~jhi/BSD-Resource-1.2907/Resource.pm)
to define stacksize directly in my perl script by using e.g. setrlimit(RLIMIT_STACK, $softlimit,
$hardlimit); Thus, these new stack size limits are now directly passed from my perl script
to my binary. 

Thanks for your time and providing me with insights to fix this issue! Cheers.  


---- Message d'origine ----
De : ledoc@netcourrier.com
À : "Pete Houston" <ph1@openstrike.co.uk>;
   users@httpd.apache.org
Objet : Re: Re: [users@httpd] Strange apache behaviour when lauching an externalbinary called
by a perl script
Date : 21/11/2013 16:53:10 CET

Nice suggestion. But unfortunately both environments are the same (and my binary is compiled
with static library option).

---- Message d'origine ----
De : "Pete Houston" <ph1@openstrike.co.uk>
À : users@httpd.apache.org
Objet : Re: [users@httpd] Strange apache behaviour when lauching an externalbinary called
by a perl script
Date : 21/11/2013 14:40:33 CET

Possibly a difference in environment would cause this (perhaps
LD_LIBRARY_PATH or similar?).

Compare the environment in your failing at job with the environment in
your successful shell command and determine if there are any
differences.

HTH,

Pete
-- 
Openstrike - improving business through open source
http://www.openstrike.co.uk/ or call 01722 770036 / 07092 020107

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