Hello,
We're running JRun 3.1 on Solaris 8 and have recently experienced some
ickiness when the traffic picks up on the site. Specifically, JRun
connections (number of connections on 127.0.0.1.8888) start to ramp up
to around 600 (they're normally in the teens after gc and in the low
one hundreds before), the website becomes unresponsive, the load average
on the box jumps up past 10, and JRun eventually croaks. It's not pretty.
During one of these outbursts, we captured a thread dump. I've been
comparing it to a thread dump performed when the application was
performing swimmingly and have a question regarding a specific thread:
"jcp-8681" prio=5 tid=0x48ebf8 nid=0x4faa waiting on monitor [d2ce1000..d2ce19c0]
at java.lang.Object.wait(Native Method)
at allaire.jrun.NetworkService.accept(NetworkService.java:198)
- locked <d99f5e88> (a java.lang.Object)
at allaire.jrun.jrpp.ProxyService.createRunnable(ProxyService.java:31)
at allaire.jrun.ThreadPool.createRunnable(ThreadPool.java:175)
at allaire.jrun.WorkerThread.run(WorkerThread.java:72)
When things were bad, 39 of these fellas appeared in the dump. When things
were good, there were only 4 which I'm guessing is normal. We think
there is a bottleneck someplace (db, maybe) which is causing these to
back up and eventually kill JRun. Is this a valid theory? Can anyone give
me more detail on what this thread does? I found some JRun documentation
which says it "provides the servlet engine service". What does this mean?
One other thing, the traffic on the site is comparable to what we've
seen so far this year and JRun has been fine up until this week.
Thanks in advance for any information,
Kari
--
Kari M. Scott
Software Engineer
Berbee
5520 Research Park Drive
Madison, WI 53711-5377
[EMAIL PROTECTED]
608.298.1223 Fax: 608.288.3037
Berbee...putting the E in business
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