-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Kobi,
On 1/6/2011 12:14 PM, Kobi Biton wrote: > -Tomcat 6.0.22 Great. Any opportunities to upgrade? Your version was never released and is over a year old. > - yes they are load balanced simple Round Robin Linux LVS , (LB > distributes the requests evenly) So, you expect each server to serve 1/N of the incoming requests per unit time. Any session stickiness? > - All the servers (But 1) had the following thread pool confguration > prior the change: > > MaxThreads=1000 , minSpareThread=25,maxSpateThreads=75 > > 1 server had: > > MaxThreads=300 , minSpareThread=25,maxSpateThreads=75 Okay, that will mean that the second server will handle, at most, 300 simultaneous connections. Do you have any per-backend-server connection limits set at the load balancer? > For some reason the server that had MaxThreads=300 report x2 > threadCount / threadBusy Via JMX polling , only after changing its > maxThreads to 1000 the threadCount/threadBusy count was decreased x2 and > matched all the other servers So, let's do an example so I can get my head around it: N = 3 Server 1: maxThreads=1000, busy=100 Server 2: maxThreads=1000, busy=100 Server 3: maxThreads=300, busy=200 Is that roughly what you observed? Was that consistent over a long period of time? Did you observe what kinds of requests were being served on server 3? If some of them were long-running, you may just be observing a natural build-up of work on a server that reliably gets 33% of incoming requests but has some older requests that are still processing. > - Indeed busyThreads <= maxThreads Good. If that weren't true, something would be terribly wrong :) > Just trying to figure out why did the maxThreads was Impacting the > thread busy/count ... I can't imagine why it would, other than putting a cap on the number of busy threads (because busyThreads <= maxThreads). What kind of lb are you using? - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0l+pYACgkQ9CaO5/Lv0PBuogCgitvm9D01NSi84oO0tVO+itdn ByMAmwfOVpq59BhVIlUtx/EswxsBm3lJ =AzZU -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
