-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Shaun,
On 7/8/2009 1:35 PM, Shaun Qualheim wrote: > *Tomcat 4.1.27-LE You might consider upgrading at some point. 4.1 is getting ready to be retired, and the 3 (yes 3!) versions since then all have significant performance improvements that may help your situation. > Apache is listening on ports 80 and 81 using http. Port 80 > immediately rewrites everything to an https:// url. That https:// url > goes to the load balancer on 443 and is passed to the appliance on port 81. Wait... what? client -- http:80 --> httpd -- https:443 --> lb -- http:81 --> Tomcat? You said you have 3 TC instances. Is that 1 instance on each of 3 separate physical servers, so port 81 is used on them all? Why bother with SSL after the request is within your network? Also, why have httpd forward all traffic to a load-balancer instead of just doing the load-balancing itself? Maybe I have misunderstood your setup, but it seems overly complicated. > When we use the our application with all http (port 80 doesn't > rewrite,) the system works fine when we run a load test. We can push > 2100 concurrent users out of each server. Okay. > However... using the same setup beyond the load balancer, we are > only about to get to about 2500 concurrent users across the three > servers (about 800 per server) before we start seeing very long > delays (1-2 minutes where we should be seeing a few seconds) on > miscellaneous functions throughout the application. Does the load-balancer have any kind of traffic shaping or bandwidth/connection limiting configured? What do your <Connector> elements look like in Tomcat's server.xml? > We're pretty perplexed on why the sudden slowdown happens at about > 800 users per server. It works fine when we're http only. We don't see > anything that stands out in the apache or catalina logs that would seem > to be concerning (broken pipes, abnormal timeouts, etc.) I would greatly > appreciate any help anyone can offer us. So, does it look like you are hitting a wall (like there aren't enough connections allowed) or does the application/server start to experience an actual slowdown (like high CPU load, lots of paging, etc.)? - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkpY/oEACgkQ9CaO5/Lv0PDlnwCgn1wLVEtYDVZiAc3JIDVL9LQY ZLIAoIwDuDf8tP1UAthX1aYxzk0xjC6n =NJun -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
