Empty call path

[Vincent Michaud-Rioux]

I installed hpctoolkit@2021.03.01 with spack on a Ubuntu 22.04 workstation. For example, I wrote the following program

program prog


   implicit none

   integer, parameter :: dp  = selected_real_kind(15, 307)
   integer, parameter :: n = 1000
   real(dp) :: A(n,n), B(n,n), C(n,n)
   integer :: i, j, k

   call random_number(A)
   call random_number(B)

   C = 0.0_dp
   do i=1, n
      do j=1, n
         do k=1, n
            C(i,j) = C(i,j) + A(i,k) * B(k,j)
         end do
      end do
   end do

end program prog

and I execute hpctoolkit with the following commands

rm -rf hpctoolkit-*-measurements
hpcrun ./prog
hpcstruct prog.f90
hpcprof -S prog.hpcstruct -I $PWD hpctoolkit-prog-measurements

This works fine on several computers, but on the said workstation hpcrun doesn't seem to find anything for the call path, and hpcviewer shows

Any idea what could be causing this?

[Jonathon Anderson]

This may be a known issue with -e CPUTIME (the default event) on Glibc >2.34. If this workstation runs Ubuntu 22.04 or RHEL 9 or a recent Fedora, this is likely the cause. Using -e cycles gives a similar metric that is unaffected by this issue.

Btw, we've migrated our active development to GitLab, new issue tracker over here: https://gitlab.com/hpctoolkit/hpctoolkit/-/issues

[Vincent Michaud-Rioux]

Got it, solved it. Thanks.