18 Mar
2007
18 Mar
'07
1:21 a.m.
Christian Schlatter wrote:
...
I always had 768MB shared memory configured though, so I still can't
explain the memory allocation errors I got. Some more test runs revealed
that I only get these errors when using a more production oriented
config that loads more modules than the one posted in my earlier email.
I now try to figure out what exactly causes these memory allocation
errors that happen reproducibly after about 220s at 400 cps.
I think I found the cause for the memory allocation errors. As soon as I
include an AVP write operation in the routing script, I get 'out of
memory' messages after a certain number of calls generated with sipp.
The routing script to reproduce this behavior looks like (full config
available at http://www.unc.edu/~cschlatt/openser/openser.cfg):
route{
$avp(s:ct) = $ct; # commenting this line solves
# the memory problem
if (!method=="REGISTER") record_route();
if (loose_route()) route(1);
if (uri==myself) rewritehost("xx.xx.xx.xx");
route(1);
}
route[1] {
if (!t_relay()) sl_reply_error();
exit;
}
An example log file showing the 'out of memory' messages is available at
http://www.unc.edu/~cschlatt/openser/openser.log .
Some observations:
- The 'out of memory' messages always appear after about 8000 test calls
per worker process. One call consists of two SIP transactions and six
end-to-end SIP messages. An openser with 8 children handles about 64'000
calls, whereas 4 children only handle about 32'000 calls. The sipp call
rate doesn't matter, only number of calls.
- The 8000 calls per worker process are independent from the amount of
shared memory available. Running openser with -m 128 or -m 768 does not
make a difference.
- The more AVP writes are done in the script, the less calls go through.
It looks like each AVP write is leaking memory (unnoticed by the memory
statistics).
- The fifo memory statistics do not reflect the 'out of memory' syslog
messages. Even if openser does not route a single SIP message because of
memory issues, the statistics still show a lot of 'free' memory.
All tests were done with openser SVN 1.2 branch on Ubuntu dapper x86. I
think the same is true for 1.1 version but I haven't tested that yet.
Christian