Re: How do I increase threads per user?

["Vladimir G. Ivanovic" <vladimir@acm.org>]

My understanding is that the 2.4 series kernels do not support many
running many threads at once. You can compile in support for NGPT
(http://www-124.ibm.com/developerworks/oss/pthreads/) with glibc 2.2
which will probably increase your ability to run many threads at once.

With the for the 2.5 series kernels (with glibc 2.3), NPLT
(http://people.redhat.com/drepper/nptl-design.pdf) is available.

--- Vladimir

------------------------------------------------------------------------
Vladimir G. Ivanovic                        http://leonora.org/~vladimir
2770 Cowper St.                                         vladimir@acm.org
Palo Alto, CA 94306-2447                                 +1 650 678 8014

>>>>> "da" == da alchemist <da_alchemist@yahoo.com> writes:

  > OS: Linux (or Sun Linux)
  > Kernel: 2.4.9-31enterprise
  > Memory: 2GB
  > CPUs: 2
  > Java: 1.4.1_01

  > I have a dual processor Cobalt LX50 and I am running
  > into a thread limit with Java. No matter what I do
  > with the Java JVM parameters (heap and stack), I
  > cannot get any more than 949 threads. My "top" output
  > shows that I am no where near my memory capacity.
  > Below is a simple Java program (28 lines long) I have
  > used to test this limit. My question is simply how do
  > I go about increasing this limit. Is there some kernel
  > parameter I can set or maybe have to recompile into
  > the kernel? My /proc/sys/kernel/threads-max is 16383.
  > I do not believe my ulimit settings are the problem,
  > but I will post them anyway. The problem also occurs
  > on non-Cobalt (plain old PCs) uniprocessor machines
  > maxxing at about 1018 threads.