Set limit on number of threads

[Justinas Urbanavicius]

Hi,

I was wondering, if there is a way to limit the number of threads that jenkins uses, at start-up i see that there are ~28 threads running jenkins.war, and they use a lot of memory.
Don't know why there should be a need for that much threads

Platform Linux debian x64
Java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.6) (6b27-1.12.6-1~deb7u1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
Jenkins v1.526

any help or info would be appreciated

[Daniel Beck]

Check out http://yourjenkins/threadDump -- the threads mostly have nice names that explain what they're for.

Maybe you have some success changing --handlerCountStartup if you're using winstone (http://winstone.sourceforge.net/#commandLine) to reduce the number of initial request handlers.

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[Andrew Melo]

Hello,

Under linux, each thread is not individually using the full amount of
memory that shows up in ps or top. There are a significant number of
shared memory pages involved, so the total memory usage isn't simply
sum( RSS_thread1, RSS_thread2 ... RSS_threadN )

HTH
Andrew

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[Justinas Urbanavicius]

thanks threadDump was very helpfull, it seems they are all needed :)

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