Hi
We're running a productive host with Debian GNU/Linux 8 and Koha 16.11.04.
One month ago I already described the case that on this host the Koha
OPAC login process is often very slow. At such occasions the following
process can be seen with "top", taking 99% of the CPU resources:
phsh-ko+ 59422 56031 11 16:30 ? 00:00:35
/usr/share/koha/opac/cgi-bin/opac/opac-user.pl
Nothing is written to the file "opac-error.log".
I had already sent the output of strace in my e-mail from 18 April 2017
18:09 but this didn't help no further. See
https://lists.katipo.co.nz/public/koha/2017-April/047804.html
With my poor Perl knowledge I have now measured the execution time of
the various parts of script "opac-user.pl". As I found out everything is
always very fast (using less than 1 second execution time) except the
very last function in this script which looks as follows:
output_with_http_headers $cgi, $cookie, $template->output, $content_type;
Usually this function takes around 2 seconds to complete, but in the
case of the slow login process it takes around 32 seconds which makes me
think there must be some kind of timeout (30 seconds).
I tried to find out more but I am stuck in file
"/usr/share/koha/lib/C4/Output.pm" where function
"output_html_with_http_headers" makes use of another function called
"output_with_http_headers".
Can anyone please give me a hint how I could dig deeper to maybe find
out why the script "opac-user.pl" sometimes takes so long to complete
its task?
Best wishes: Michael
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