Re: Tomcat 5 pause (free gmail account for fix :-)

Shapira http://www.yoavshapira.com -Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 4:04 PM To: Tomcat Users List; Sam Gallant Subject: RE: Tomcat 5 pause (free gmail account for fix :-) I reckon this still might be a garbage

RE: Tomcat 5 pause (free gmail account for fix :-)

Are you defining any Memory Min/Max (-Xms/-Xmx) constraints on the JVM? Are you collecting any verbose GC information (-verbose:gc)? How much physical memory available on the machine? At times of 100% CPU Utilization, is it java that is consumnig the majority of it? -Original Message-

Re: Tomcat 5 pause (free gmail account for fix :-)

On Thu, Oct 14, 2004 at 02:16:56PM -0500, Sam Gallant wrote: : My company has been using Tomcat for several years, but a problem has : crept up that we have not been able to solve. Basically, tomcat will : stop processing requests for 2-60 second period several times a day. It still may be some

Re: Tomcat 5 pause (free gmail account for fix :-)

We have done default gc with 8mb/256mb min/max, default gc with 128mb/256mb min/max, and incremental with the same settings. The machine has 512mb ram. When we turn on verbose gc the gc logging just stops after a period of time both on the sun jvm and the ibm. When there is 100% cpu util jsvc is

RE: Tomcat 5 pause (free gmail account for fix :-)

Is your machine swapping? 512MB can go quickly... -Original Message- From: Sam Gallant [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 3:40 PM To: Montz, James C. (James Tower) Cc: Tomcat Users List Subject: Re: Tomcat 5 pause (free gmail account for fix :-) We have

Re: Tomcat 5 pause (free gmail account for fix :-)

I have a similar problem(TC 3.3.1) but it is related to our pooling solution running out of connections and/or it trying to reap not-checked-in connections. The lockups users reported were during a reap cycle. After a few seconds up to a minute(sound familiar) it would go away and the app

Re: Tomcat 5 pause (free gmail account for fix :-)

We have tried using a profiler, but it hasn't worked well because the problem only happens a few times over an eight hour day. When we run the profiler the we get a different effect which may or may not be the same problem plus the new effect happens quite often. Has anyone else run into problem

RE: Tomcat 5 pause (free gmail account for fix :-)

I reckon this still might be a garbage collection problem. I would download jvmstat from sun and use visualgc to monitor this. It gives a good graphical representation of when the box is garbage collecting and how much stuff is in each of the generations. We had a similar situation and this

RE: Tomcat 5 pause (free gmail account for fix :-)

Hi, Excellent post, that one from Matt Dale -- good advice. Yoav Shapira http://www.yoavshapira.com -Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 4:04 PM To: Tomcat Users List; Sam Gallant Subject: RE: Tomcat 5 pause (free gmail account

Re: Tomcat 5 pause (free gmail account for fix :-)

-Original Message- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 4:04 PM To: Tomcat Users List; Sam Gallant Subject: RE: Tomcat 5 pause (free gmail account for fix :-) I reckon this still might be a garbage collection problem. I would download jvmstat from sun

Re: Tomcat 5 pause (free gmail account for fix :-)

? 512MB can go quickly... -Original Message- From: Sam Gallant [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 3:40 PM To: Montz, James C. (James Tower) Cc: Tomcat Users List Subject: Re: Tomcat 5 pause (free gmail account for fix :-) We have done default gc

RE: Tomcat 5 pause (free gmail account for fix :-)

To: Tomcat Users List Subject: Re: Tomcat 5 pause (free gmail account for fix :-) Matt, We have used jvmstat/visualgc which is how we found out that the problem happens at times when no gc is taking place. We are actually logging every second with jvmstat everyday at this point. The problem we

Re: Tomcat 5 pause (free gmail account for fix :-)

is required by the app so as not to experience out of memory exceptions. -Original Message- From: Sam Gallant [mailto:[EMAIL PROTECTED] Sent: 14 October 2004 21:25 To: Tomcat Users List Subject: Re: Tomcat 5 pause (free gmail account for fix :-) Matt, We have used jvmstat

Re: Tomcat 5 pause (free gmail account for fix :-)

From: Cox, Charlie [EMAIL PROTECTED] Sent: Thursday, October 14, 2004 12:54 PM Is your machine swapping? 512MB can go quickly... It sounds like swapping to me. The problem is that even though you say 256MB on the Java Heap, the heap consumes a LOT more than that in Real Ram, and could easily