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