Which version of NFS are you using ? I suggest you try v3 - it is more efficient. We've run into issues with v4 causing unacceptable response times. For the kind of drop you are seeing, I am surprised that you don't find any errors anywhere. In the first 400 user run for example, it looks like all the processes either exited or are stalled. In either case, I would expect to see errors in the faban run log (either that the driver got an error or that it timed out). Are you sure you checked the faban log ?
Have you tried running nfsstat to see if you can spot anything ? Shanti On Sun, May 23, 2010 at 7:07 PM, Vasileios Kontorinis <[email protected] > wrote: > Shanti hi again, > I sort of managed to fix that. I tried upgrading my php version to > 5.2.6 and the alert went away. My problems though are not fixed. > I even tried completely removing suhosin patch (it was a huge pain in > ubuntu, since you need to recompile the php module by yourself) > Still though my proms are there. > > Now, I get no warning the logs are clean but I get weird behavior. I needed > to send you guys some pics so I created a related page at: > http://cseweb.ucsd.edu/~vkontori/olio/olio.html<http://cseweb.ucsd.edu/%7Evkontori/olio/olio.html> > I have comments describing the prom at the end. > > <http://cseweb.ucsd.edu/%7Evkontori/olio/olio.html>Any help would be most > appreciated. I ve spent so much time on it without figuring it out. > My configuration is 1 web server on a vm with 6GB of mem. 4 cpus > 1 db server on a vm with 5GB of mem. 4 cpus > 1 fs server on a vm with 4GB of mem. 4 > cpus. (this one just exposes over NFS the filestore) > All on the same physical machine a nehalem based server, siting on a Sun's > Black box. > I got similar behavior when I exposed the filestore on the Sun's thumper. > > Any help would be most appreciated. > > Thanks > > ------------------------------------------------------------------- > Kontorinis Vasileios > Phd student, University of California San Diego > http://cseweb.ucsd.edu/~vkontori/ <http://cseweb.ucsd.edu/%7Evkontori/> > [email protected] > ------------------------------------------------------------------- > > > 2010/5/19 Shanti Subramanyam <[email protected]> > > It's strange that multiple files seem to be complaining about it. Did you >> try disabling Suhosin ? Are you seeing a perceptible drop in memory after >> reaching steady state ? >> >> shanti >> >> >> On Wed, May 19, 2010 at 4:28 PM, Vasileios Kontorinis < >> [email protected]> wrote: >> >>> Lately I get a bunch of these errors in my logs: >>> >>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary >>> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file >>> '/var/www/oliophp/public_html/taggedEvents.php') >>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary >>> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file >>> '/var/www/oliophp/public_html/taggedEvents.php') >>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary >>> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file >>> '/var/www/oliophp/public_html/users.php') >>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary >>> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file >>> '/var/www/oliophp/public_html/events.php') >>> [Wed May 19 22:26:37 2010] [error] [client 10.17.255.250] ALERT - canary >>> mismatch on efree() - heap overflow detected (attacker '10.17.255.250', file >>> '/var/www/oliophp/public_html/taggedEvents.php') >>> >>> According to blogs it is a php related issue. Suhosin patch detects a >>> memory overflow and complains. >>> I was just wondering if the Olio php code is having any known mem. leaks. >>> >>> My php version on ubuntu: >>> PHP 5.2.4-2ubuntu5 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 27 2008 >>> 20:46:51) >>> Copyright (c) 1997-2007 The PHP Group >>> Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies >>> >>> It's too bad that I do not get a line on the php files that cause this. >>> >>> >>> Has anyone come across this one before? >>> >>> >>> ------------------------------------------------------------------- >>> Kontorinis Vasileios >>> Phd student, University of California San Diego >>> San Diego, CA 92122 >>> Cell. phone: (858) 717 6899 >>> [email protected], [email protected] >>> ------------------------------------------------------------------- >>> >> >> >
