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1answer
47 views

High CPU utilisation w3wp.exe - GC issue?

I've inherited a website that uses a lot of session state. We've recently experienced continuous high CPU ~95-100% for prolonged period of times. When debugging using DebugDiag, it shows that there ...
1
vote
1answer
501 views

JVM crash with segmentation fault

We have a cluster of tomcat servers, just upgraded to debian7/openjdk7/tomcat7 (all from stock debian). Now we had two JVM crash on different machines. Both servers having identical hardware and are ...
0
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1answer
30 views

Discrepancy in java Garabage Collection between jconsole and log files

I'm having an odd problem: my garbage collection log file (as defined by -Xloggc) will show n number of garbage collections have taken place, but jconsole will show n+6 garbage collections have taken ...
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3answers
639 views

Why are Full GCs not running on my gcInterval I set?

ColdFusion 10 Update 10 Windows Server 2008 R2 Java 1.7.0_21 I am trying to figure Full GCs to run every 10 minutes. I have used the gcInterval JVM arg in the past on earlier versions of ...
11
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2answers
2k views

Why does Debian clean php sessions with a cron job instead of using php's built-in garbage collector?

Debian and derivatives (Ubuntu) don't use the php session garbage collector session.gc_probability = 0 instead they use a cron /etc/cron.d/php5 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] ...
0
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1answer
200 views

When the JVM is doing a complete GC, is it expected to see a large number of page fault/sec?

It is Window 2003 server. We are running some performance test, and what we see is: 1. In first 5 hours, the page fault/sec is very small, like 10 or 20 In the last 1 hour, the page fault jumps to ...
0
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1answer
185 views

JVM garbage collection: What is the difference between “survivor 1” and “survivor 2”?

In Oracle's Java Virtual Machine's Garbage Collector, what are the respective roles of "survivor 1" and "survivor 2" ? Are the objects always moving like: Eden → Survivor 1 → Survivor 2 Or can an ...
1
vote
2answers
720 views

Periodic unresponsiveness in tomcat

I am experiencing periodic unresponsiveness in tomcat in our production environment. I cannot reproduce this in a test environment, and nothing appears in the logs prior to or during the event. ...
0
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1answer
475 views

Frequent occurence of FULL GC

There is a frequent occurence of FULL GC in our system. We are using Java application running on Tomcat server. Our application is running using internal load balancer setup. We are seeing lot of ...
4
votes
3answers
6k views

Tomcat intermittent slowdowns, unresponsive, hangs

I've been trying to track down the cause of intermittent slowdowns of our Tomcat server. We get the slowdowns several times a week, where Tomcat will stop responding or take several minutes to ...
1
vote
1answer
117 views

is it safe for the Apache to be the owner of the session directory (php)

Since I have upgraded to php 5.3 I have issues with the session GC. Seems he can't access the directory which is owned by root, Although I see sessions are being created there. Is it safe to change ...
3
votes
3answers
3k views

JAVA_OPTS -XX:+PrintGCDetails affect on performance?

Does anyone know if the PrintGCDetails affects java performance much? I've been monitoring our java garbage collecting on a staging server with the same setup as the production server. I assumed ...