Hi CF linuxers,
I've been running CFMX on Jrockit 1.4.2 for a long time now. It has always
performed far better than the other JVMs for our applications. Only 1 crash in
over 2 years. Current uptime of a few months.
However, as our traffic has risen and the complexity of our apps has grown,
we've started to notice a garbage collection problem.
Short term garbage collection works great. There are almost no noticable
pauses in everyday operation. The server handles 1000+ users at a time without
much of a problem.
However, once in a long time (every 12 hrs? 18 hrs? 24 hrs? something on that
magnitude), the JVM becomes totally unresponsive for 2 or 3 minutes. It
completely stops processing templates, and then returns to normal at the end of
the 3 minutes. CFSTAT freezes, indicating nothing is going on. The DB server
is processing no queries.
I suspect that it is using this period of time to do some sort of major
long-term garbage collection. This is a bit of a problem, since some of our
applications are real-time sensitive and we really can't have these pauses.
So I was wondering if anyone has any ideas on what may be causing these
infrequent yet severe pauses.
This server is dedicated to HTTP / CFMX6.1. DB is on a different server.
Here is the status of our memory at steady state:
total used free shared buffers cached
Mem: 4130600 4114828 15772 0 7844 2141576
-/+ buffers/cache: 1965408 2165192
Swap: 1052248 304 1051944
Here are our JVM args:
java.args=-server -DJINTEGRA_NATIVE_MODE -DJINTEGRA_PREFETCH_ENUMS
-Xbootclasspath/a:{application.home}/lib/webchartsJava2D.jar -Dja
va.awt.graphicsenv=com.gp.java2d.ExHeadlessGraphicsEnvironment -Xmx1000m
-Xms1000m -Xgcprio:pausetime
I think we could probably up that 1000 Xmx, but wouldnt that just make the
garbage collection problem more severe?
The "pausetime" param is described as "The pausetime priority should be used
when the application depends on an even performance." Yet the pauses are still
occurring.
Thoughts on possible solutions would be much appreciated. Thanks.
Terry
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