`-m minimal -b mpi:3` crashing

[colleeneb]

In a run setting -m minimal -b mpi:3 we get a crash:

>  mpirun -n 1 -ppn 1 -- iprof -m minimal -b mpi:3 -- gpu_tile_compact.sh ./flops
Single Precision Peak Flops: 21305.7 GFlop/s
Double Precision Peak Flops: 10694.6 GFlop/s
THAPI: Trace location: /home/bertoni/thapi-traces/thapi_aggreg--2026-02-16T17:58:03+00:00
W, [2026-02-16T17:58:03.606541 #204348]  WARN -- : No source found in ["/home/bertoni/thapi-traces/thapi_aggreg--2026-02-16T17:58:03+00:00"]

with --no-analysis it does not crash:

>  mpirun -n 1 -ppn 1 -- iprof --no-analysis -m minimal -b mpi:3 -- gpu_tile_compact.sh ./flops
Single Precision Peak Flops: 21311 GFlop/s
Double Precision Peak Flops: 10694.6 GFlop/s
THAPI: Trace location: /home/bertoni/thapi-traces/thapi--2026-02-16T17:58:38+00:00

This can be reproduced with the following:

> module load thapi # on sunspot, so version looks like `git.426c8097e536fe40a8148bb83787ea695c91c57a=0.0.12-git.113`
> cat flops.cpp
#include <mpi.h>

int main(int argc, char **argv) {

  MPI_Init(NULL, NULL);
  MPI_Finalize();
}
> mpicxx -fiopenmp -fopenmp-targets=spir64 flops.cpp -o flops
> mpirun -n 1 -ppn 1 -- iprof -m minimal -b mpi:3 -- gpu_tile_compact.sh ./flops
THAPI: Trace location: /home/bertoni/thapi-traces/thapi_aggreg--2026-02-16T18:01:31+00:00
W, [2026-02-16T18:01:31.448234 #205202]  WARN -- : No source found in ["/home/bertoni/thapi-traces/thapi_aggreg--2026-02-16T18:01:31+00:00"]

[TApplencourt]

I see the problem, we forgot a minimal case here
https://github.com/argonne-lcf/THAPI/blob/c3d2ace0a3e20ff1883424eade701d7f6d3ca12f/xprof/xprof.rb.in#L642

[TApplencourt]

But it's not crashing :p Just no even. I suppose we should miminaly put some warm to said "No event in minimal".
Or minimal == normal, make more sense

[colleeneb]

Ah, you're right, I chose my words badly! More like a change request. I would vote to let minimal == normal if no minimal filter exists. But I'm ok with a warning too (so I can find when I did something stupid quicker!)

[TApplencourt]

Great mind think alike

• https://github.com/argonne-lcf/THAPI/tree/refs/heads/fix_mpi_minimal

Hopefully that work, and I open the PR : )