Jake Vickers
Tue, 09 Feb 2010 18:20:15 -0800
Eric Shubert wrote:
Phil Leinhauser wrote:Is there anything like a load tester for QMT to mimic the 500 user limit?I don't know of one. (Doesn't mean there isn't one)It'd be nice to have a testing harness of some sort for QMT. Anyone up for writing one?
One of the setups I was working on was Xen, but there is one running ESX. They have 500 users, all using IMAP, and some users experience 8-10 minute lags in accessing their imap stores (or webmail). IMAP processes have been increased, and the softlimit has also been increased. I do agree we could use some testing tools (this should be on the devel list, and can easily be added to the "tools" section of the subversion repo). I used to have a script around here somewhere that dumped 10K emails to load test, but haven't used it in a long time and would have to really dig to find it. I just wonder if the imap load isn't hitting a limitation in the VMware storage structure. The system has enough horse power and lots of RAM. 'sar' shows the cpu is not working very hard. When running a 'du -sh *' on the /home/vpopmail/domains takes as long as 7 minutes on a couple domains, which is what points me towards a VMware filesystem suspicion, since that "test" is not even using imap but straight file access.
As a side thought - anyone ever looked at freshmeat on some pop/imap testing tools?
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