I am getting errors like this:
[Mon Aug 11 16:34:23 2014] [error] [client 54.200.16.41] mod_wsgi
(pid=23422): Exception occurred processing WSGI script
'/home/econ/utility/web2py/wsgihandler.py'.
[Mon Aug 11 16:34:23 2014] [error] [client 54.200.16.41] IOError: failed to
write data
[Mon Aug 11 16:37:44 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:37:49 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:37:55 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:00 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:05 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:10 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:15 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:21 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:26 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:31 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:36 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:41 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:46 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:52 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:38:57 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:39:02 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:39:07 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:39:12 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:39:18 2014] [error] [client 54.200.16.41] Script timed out
before returning headers: wsgihandler.py
[Mon Aug 11 16:39:23 2014] [error] [client 54.200.16.41] mod_wsgi
(pid=23422): Exception occurred processing WSGI script
'/home/econ/utility/web2py/wsgihandler.py'.
[Mon Aug 11 16:39:23 2014] [error] [client 54.200.16.41] IOError: failed to
write data
When this happens apache freezes and the access.log reports HTTP 408 errors:
193.174.89.19 - - [10/Aug/2014:07:38:03 +0000] "-" 408 0
The first time this happened the server was online and it was taken
offline. Later on I was trying to simulate traffic
for short periods of time and this error does seem to get bigger with the
volume of the traffic but sometimes
even large volume of traffic does not trigger it and sometimes smaller
amount of traffic triggers it.
This seems to be demanding of the CPU resources but memory seems to be
largely idle (top):
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2967 econ 20 0 142m 83m 16m S 60 2.1
41:34.55 apache2
3308 postgres 20 0 50036 35m 32m S 20 0.9
10:01.85 postgres
$ free -m
> total used free shared buffers cached
Mem: 4002 953 3049 0 31 662
-/+ buffers/cache: 258 3743
Swap: 511 0 511
But given that the server has 4 cores it appears unlikely to me that this
would simply be a hardware resource constraint.
<https://lh4.googleusercontent.com/-beXBtMAxZLQ/U-pYJ5We93I/AAAAAAAADmA/CQCf0aWt0C0/s1600/proportion_408_April21_experiment_file_subset.png>
The above picture shows the proportion of the HTTP 408 Timeout Error of all
HTTP requests.
Do you know what might be causing the problem?
Thanks!
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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