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Too Many System Threads in WAITING state

  • 1.  Too Many System Threads in WAITING state

    Posted Thu February 12, 2015 03:18 AM

    Hello All,

    I am currently facing issue that the system threads is getting increased at an alarming rate and too many threads are in WAITING state,

    “NonStopCache [SoftwareAG.IS.Core.AMSDEV] Executor Thread-54 for ‘HTTP Handler 127.0.0.1’” Id=70855 in WAITING
    at java.lang.Object.wait(Native Method)
    - waiting on <0x3794b1fa> (a net.sf.ehcache.constructs.nonstop.NonstopThreadPool$Worker)
    at java.lang.Object.wait(Object.java:503)
    at net.sf.ehcache.constructs.nonstop.NonstopThreadPool$Worker.waitUntilTaskAvailable(NonstopThreadPool.java:276)
    at net.sf.ehcache.constructs.nonstop.NonstopThreadPool$Worker.run(NonstopThreadPool.java:231)
    at java.lang.Thread.run(Thread.java:724)

    “Service Thread Pool” Id=70810 in WAITING
    at java.lang.Object.wait(Native Method)
    - waiting on <0x6153e7d5> (a com.wm.app.b2b.server.TMPooledThread)
    at java.lang.Object.wait(Object.java:503)
    at com.wm.util.pool.PooledThread.run(PooledThread.java:110)
    at java.lang.Thread.run(Thread.java:724)

    Please find the statistics below for the system threads.

    Current	Peak	Limit
    

    Total Sessions 4 16 -
    Licensed Sessions 0 6 2147483647
    Stateful Sessions 0 5 2147483647
    Service Instances 5 37 -
    Service Threads 3 9 -

    System Threads 551 555 -

    Below is the JVM memory settings for the IS,

    set JAVA_MIN_MEM=2048M
    set JAVA_MAX_MEM=2048M
    set JAVA_MAX_PERM_SIZE=512M

    Please find the server thread pool info also,

    Available Threads 97 % (772 Threads)
    Maximum Threads 800
    Minimum Threads 50
    Available Threads Warning Threshold 15 % (120 Threads)
    Scheduler Thread Throttle 75 % (600 Threads)
    Scheduler Current Threads 0

    My question to the team is why the threads are staying in WAITING state instead of getting released.

    Also we are seeing the below GC related message in the ehcache logs

    ClientID[21]: Lock GC collected 4 garbage locks

    Please help

    Thanks and Regards
    Abir Banerjee


    #Integration-Server-and-ESB
    #webMethods


  • 2.  RE: Too Many System Threads in WAITING state

    Posted Thu February 12, 2015 04:06 AM

    See if there are any service which are running from a long time or if it is hung.

    Restart the IS so that the waiting threads will be released.


    #webMethods
    #Integration-Server-and-ESB