On Tue, Mar 27, 2007 at 03:21:18PM +0200, Thib wrote: > Hi, > > I almost finished writing my module and made some benchmarks to check > performance. I was quiet suprise by what happen. > > I used JMeter to send HTTP Post request to my module. I ran 5 parallel > threads which sent 5000 requests each in series. At the beginning the > performance are near 500 request per second but decrease quickly to finish > at 250 req/s. > > I don't understand why performance decrease... I check undelivered memory > structures but all look like fine. > > Anyone has ever meet this kind of problems ?
You may want to check for sockets in wait state (netstat -tupan | grep
TIME_WAIT). If they accumulate, you can end up in a situation where
free socket become scarce. This will also be noticeable by outliers in
the response time data.
Regards,
Peter
--
SUSE LINUX Products GmbH Bug, bogey, bugbear, bugaboo:
Research & Development A malevolent monster (not true?);
Some mischief microbic;
What makes someone phobic;
The work one does not want to do.
From: Chris Young (The Omnificent English Dictionary In Limerick Form)
pgpeWuo79tX3O.pgp
Description: PGP signature
