I have moved this discussion here as you suggested.
Version info:
- RB 2.0.18
- Debian 7.6
- Apache 2.2.2 with mod_wsgi
Yes, this is not normal. I have been administering RB for 2 yrs.
This happened for the first time.
I enabled server-status for Apache and checked that there were
several keep-alive threads.
There are some queries that we run against ReviewBoard using
the REST API - some of these queries cause keep-alive.
Keep alive is ok as long as the child apache processes do not take 100% CPU.
But, that was not the case -
Also, at one point in time all 4 CPUs were at 100%
Review Board log, apache log & syslog do not give me any clue.
I will investigate. In the meantime if you have any clue, that will be
helpful.
Thanks,
top - 13:10:09 up 513 days, 2:39, 5 users, load average: 2.08, 2.13, 2.01
Tasks: 121 total, 1 running, 120 sleeping, 0 stopped, 0 zombie
%Cpu0 : 8.9 us, 0.3 sy, 0.0 ni, 90.1 id, 0.0 wa, 0.0 hi, 0.7 si,
0.0 st
%Cpu1 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 2.7 us, 0.0 sy, 0.0 ni, 97.3 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
KiB Mem: 8200212 total, 6805576 used, 1394636 free, 299688 buffers
KiB Swap: 3071996 total, 16576 used, 3055420 free, 1688108 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
6874 www-data 20 0 92120 3288 1088 S 0.0 0.0 0:00.00
apache2
6876 www-data 20 0 614m 228m 7376 S 99.8 2.9 202:46.27
apache2
6878 www-data 20 0 624m 231m 7380 S 99.8 2.9 221:18.05
apache2
9348 www-data 20 0 1395m 967m 7592 S 2.0 12.1 10:59.89 apache2
(gdb) where
#0 0x00007f4e64a2118d in read () at ../sysdeps/unix/syscall-template.S:82
#1 0x00007f4e65542cd4 in ap_mpm_pod_check ()
#2 0x00007f4e6551524b in ?? ()
#3 0x00007f4e655417a9 in ?? ()
#4 0x00007f4e65541839 in ?? ()
#5 0x00007f4e65542305 in ap_mpm_run ()
#6 0x00007f4e65515ee6 in main ()
(gdb) where
#0 0x00007f4e64a213b0 in __accept_nocancel () at
../sysdeps/unix/syscall-template.S:82
#1 0x00007f4e629f42c1 in ?? () from /usr/lib/apache2/modules/mod_cgid.so
#2 0x00007f4e629f4d87 in ?? () from /usr/lib/apache2/modules/mod_cgid.so
#3 0x00007f4e6552ad99 in ap_run_post_config ()
#4 0x00007f4e65515ec3 in main ()
Hi,
That's not normal at all for them to hang. What version of Review Board are
you running?
Can you provide more details about your system? Apache version, Apache
configuration, mod_wsgi vs fastcgi vs mod_python?
(Btw, this would be best on [email protected], as it's not related
to the development of the product or add-ons.)
Christian
--
Christian Hammond - [email protected]
Review Board - https://www.reviewboard.org
Beanbag, Inc. - https://www.beanbaginc.com
- hide quoted text -
On Fri, Feb 5, 2016 at 9:17 AM, Koushik Roy <[email protected]> wrote:
> - hide quoted text -
>
> At my site where Review Board is deployed, I found that 4 apache threads
> are hung.
>
These threads are running underlying Review Board code.
>
> Any clue as to how to find out what caused these threads to hang?
>
Any method to attach a debugger to the Python code?
>
> Thanks for the help.
>
> Koushik
>
>
> --
> ---
--
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