Hui Zhou comments

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                                            Hui Zhou

ROMIO: excessive number of calls to memcpy()

I haven't looked at the code, but a scale of 4 (from 8.27 to 33.07) from contig to noncontig seems normal to me especially if the data consists of many...

ROMIO: excessive number of calls to memcpy()

Thank you for the details! Hui

ROMIO: excessive number of calls to memcpy()

Writing down my notes after looking at the code – The buffer in memory is a "dense" non-contig datatype – in the reproducer it's two segments -- but the filetype...

Feature request: improved zero-copy non-contiguous send

I'm sorry for not getting back to you sooner. Yes, we can improve the non-contig IPC. To help prioritize, if you have any use cases, please add.

Feature request: improved zero-copy non-contiguous send

We can just extend the features you asked for. We'll ping back here to solicit your assistance in testing when have the pull request.

hydra_pmi_proxy encounters libcudart.so linker error on Ubuntu22

Turns out `hydra` will need the GPU dependency to enable GPU bindings. I'll label this `wont fix` for now.

Virtual topologies

by default there is no virtual topology, i.e. a flat topology

[4.2.0] Assert in mpl_gpu_ze.c:466 when ZE_AFFINITY_MASK set to second device

The `local_ze_device_count` here should be 1. However, the `local_dev_id` includes both root device and subdevices. So I believe it is 3 here (1 root + 2 sub). Thus I don't...

ABI: Fortran binding on top of core C ABI

@dalcinl This what I am experimenting.

ABI: Fortran binding on top of core C ABI

### Current ABI draft - * All fortran interop C API are included in MPI C ABI, e.g. `MPI_INTEGER`, `MPI_Comm_f2c`, `MPI_F_STATUS_IGNORE` * Jeff intended an MPI ABI implementation that does...