Hi Tomás Thanks for your hints! You wrote:
output_with_http_headers is a function that calls the templates code. I would bet it is an IO problem.
Please run iotop while reproducing the problem. I would expect to see some iowait.
I installed the command "iotop" and ran it when reproducing the problem. But it shows nothing special: Total DISK READ : 0.00 B/s | Total DISK WRITE : 0.00 B/s Actual DISK READ: 0.00 B/s | Actual DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 64690 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.03 % [kworker/1:2] 64000 be/4 www-data 0.00 B/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init 2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd] 3 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % ksoftirqd/0] 1540 be/4 Debian-g 0.00 B/s 0.00 B/s 0.00 % 0.00 % gnome-she~nf worker] 5 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0H]
Do you have template_cache_dir set?
I added the following line in file "koha-conf.xml" just after the two memcached lines: <memcached_servers></memcached_servers> <memcached_namespace></memcached_namespace> <template_cache_dir>/tmp</template_cache_dir> Then I restarted Koha. The problem persists. I couldn't find anything special in directory "/tmp". But since I don't know what "template_cache_dir" should do I don't know what to expect from it...
Is it on a fast hard drive? You could try mounting a tmpfs filesystem in there and compare results.
The Koha host resides in a virtual machine (run by Hyper-V, using Integrated Services). Unfortunately I have no direct access to the console there.
Also for debugging you should better use plack's tools instead:
enable 'Debug', panels => [ qw(DBITrace Memory Timer) ];
In plack.psgi and even the NTYProf panel. Maybe we need to improve the docs for this.
I added this line to file "plack.psgi" and restarted Koha. Koha wasn't responding anymore but the file "plack-error.log" said: Error while loading /etc/koha/plack.psgi: Can't locate Plack/Middleware/Debug.pm in @INC (you may need to install the Plack::Middleware::Debug module) (@INC contains: /usr/share/koha/lib/installer /usr/share/koha/lib /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.20.2 /usr/local/share/perl/5.20.2 /usr/lib/x86_64-linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl .) at /etc/koha/plack.psgi line 29. I tried to add "use Plack::Middleware::Debug;" to the file but it turned out this Perl module isn't part of the Koha installation, so I installed it: # apt-get install libplack-middleware-debug-perl Then I activated the following lines in file "plack.psgi". use Plack::Middleware::Debug; ... enable 'Debug', panels => [ qw(DBITrace Memory Timer) ]; Then I restarted Koha. This gave me no additional output in logfile "plack-error.log". My time measurement still gives the following: 1. 12:45:14 START opac-user.pl / 1494420314.20786 2. 12:45:14 START opac-user.pl (right before function) / 1494420314.41777 * 4. 12:45:47 START function (in Output.pm) called by opac-user.pl * 5. 12:45:47 END function (in Output.pm) called by opac-user.pl * TIME function: 0.00157809257507324 6. 12:45:47 END opac-user.pl / 1494420347.53212 TIME : 33.3242571353912 When everything is done the following lines appear in file "plack.log". 178.238.175.156 - - [10/May/2017:14:45:47 +0200] "POST /opac/opac-user.pl HTTP/1.1" 200 319007 "http://bibliothek.phsh.ch/cgi-bin/koha/opac-main.pl?logout.x=1" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0" 178.238.175.156 - - [10/May/2017:14:45:48 +0200] "GET /opac/errors/404.pl HTTP/1.1" 404 205852 "http://bibliothek.phsh.ch/cgi-bin/koha/opac-user.pl" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0" 178.238.175.156 - - [10/May/2017:14:45:48 +0200] "GET /opac/errors/404.pl HTTP/1.1" 404 205852 "http://bibliothek.phsh.ch/cgi-bin/koha/opac-user.pl" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0" Does this make some sense to you? Best wishes: Michael (slowly going nuts...) -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch