Maximum number of threads in a JVM?

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There will be some limits imposed by your operating system and hardware configuration.

To raise the number of concurrent threads you should lower the default stacksize java -Xss 64k.

  • A Oracle 32 bit JVM will default to 320kb stack size per thread.
    • For a 32 bit JVM with 2gb of addressable memory this will give you a maximum of 6.5k threads.
  • A Oracle 64 bit JVM will default to 1M stack size per thread.
    • For each gigabyte of memory you would get 1024 threads using the defaults.
  • For Linux only:
    • ulimit -a will give you the configured limits, for user processes and memory
    • You will only get 32k unique PIDs in linux cat /proc/sys/kernel/pid_max – a maximum of 32k processes.
    • You will get only 255k threads cat /proc/sys/kernel/threads-max

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