OpenMP+F90: How to create more threads on Itanium2 CPU?

[HM Li]

If there are N idle CPUs, it can't create more than N threads on superdome 9000 server(Intanium2, HP-UX and HP Fortran).

But the same code can run on rx2600 cluster(Redhat AS4, Intel Fortran and the same Itanium2 CPU as the superdome).

I have tested MPI on the same superdome server, and it can create 80 processes even only two CPUs.

What's wrong? How to configure the superdome to support creating more OpenMP threads.

Thank you.

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hpsc->cat x.f90
program hello
use omp_lib
implicit none
integer tid, num
!$omp parallel private(tid, num)
tid = omp_get_thread_num()
num=OMP_GET_NUM_THREADS()
print*, tid,num
!$omp end parallel
end
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hpsc->f90 +Oopenmp x.f90
x.f90
program HELLO

11 Lines Compiled
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hpsc->export OMP_NUM_THREADS=80
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hpsc->./a.out
0 2
1 2
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hpsc->uname -a
HP-UX hpsc B.11.23 U ia64 0700834332 unlimited-user license
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hpsc->f90 -v
f90: IA64 system (32-bit, +DSblended); cache: 6144KB, 128B line, 24-way

[HM Li]

C: setenv OMP_OVERSUB 1
bash: export OMP_OVERSUB=1

It's OK now.