Memory profiling: how to get more details on total usage?

[n8xm]

When I enable AMReX-based profiling with MEM_PROFILE = TRUE, I get output like this:

Total GPU global memory (MB) spread across MPI: [65520 ... 65520]
Free  GPU global memory (MB) spread across MPI: [64220 ... 64220]
[The         Arena] space (MB) allocated spread across MPI: [49140 ... 49140]
[The         Arena] space (MB) used      spread across MPI: [0 ... 0]
[The  Device Arena] space (MB) allocated spread across MPI: [504 ... 504]
[The  Device Arena] space (MB) used      spread across MPI: [0 ... 0]
[The  Pinned Arena] space (MB) allocated spread across MPI: [4249 ... 5035]
[The  Pinned Arena] space (MB) used      spread across MPI: [0 ... 0]

I'm assuming this is showing me usage on the first and last MPI rank? Is there a way to print this information for all ranks?
See also related Discussion #4466 .

[WeiqunZhang]

No, it's not the first and last MPI rank. It's the ranks that use the least and most memory. If you want to print for all ranks, you can call amrex::Arena::PrintUsageToFiles (std::string const& filename, std::string const& message);. Each process will have a file named $filename.$rank that contains the memory information and optional message provided by the user.