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ThreadPool warning when Size=MaxSize

jaejae Member John EisenmanOrganization: Orange SVProject: N/A
I initially configured a server with a ThreadPool Size=5 and a MaxSize=10. However, I observed that threads were being constructed and destroyed quite often (after 10 hours, I was up to 26,000 threads). In my case, each thread creation made a new DB Connection, so I was unhappy with this situation.

Instead, I configured Size=10 and did not set a MaxSize.

Now, I continue to observe these warnings:
ImagePosterCrawler-cl6: warning: thread pool `Ice.ThreadPool.Server' is running low on threads
Size=10, SizeMax=10, SizeWarn=8

Since the number of threads should now be fixed at 10 (min and max the same), why does Ice warn me about this?
>>> server describe ImagePosterCrawler-cl6
server `ImagePosterCrawler-cl6'
{
    application = `ImageServer'
    node = `cl6'
    exe = `java'
    pwd = `bin'
    activation = `on-demand'
    options = `-Djava.library.path=/usr/lib64/jmagick -Xmx100m -jar ImagePoster.jar [email protected]'
    properties
    {
        ImagePosterAdapter.Endpoints = `tcp -h cl6'
        Ice.MessageSizeMax = `10240'
        Ice.ThreadPool.Server.Size = `10'
        Ice.Default.Package = `com.wink.content'
    }
    adapter `ImagePosterAdapter'
    {
        id = `ImagePosterCrawler-cl6.ImagePosterAdapter'
        replica group id = `ImagePosterCrawlerGroup'
        endpoints = `tcp -h cl6'
        register process = `true'
        wait for activation = `true'
    }
}

Comments

  • michimichi Member Michi HenningOrganization: Triodia TechnologiesProject: I have a passing interest in Ice :-) ✭✭✭
    By default, SizeWarn is 80% of SizeMax. Ice warns you so you get some indication that your server may be running out of threads and, if you were to add more threads, you could gain more concurrency.

    If you set SizeWarn == SizeMax, you will get a warning only when a request uses the last remaining thread in the pool; if you set SizeWarn == 0, you will not get any warnings.

    You may also want to read the FAQ about this topic.

    Cheers,

    Michi.
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