Joseph Schuchart

Handling of C++ new and delete

4

I just tested your STACK tool with success as I found two bugs in our code base. Great work, many thanks! However, I came across a load of warnings that...

mpirun hangs intermittently

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I'm seeing mpirun hanging during startup on our system. Running `mpirun` in a loop eventually hangs, typically after a few dozen iterations: ``` for i in $(seq 1 100 );...

As per the discussion in https://github.com/open-mpi/ompi/pull/10492 (https://github.com/open-mpi/ompi/pull/10492#issuecomment-1189087429) we want to replace the C11 `_Atomic` variables with a custom wrapper around basic atomic types. However, this requires significant changes throughout the...

C11 atomics: replace _Atomic with volatile

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Using the `_Atomic` type modifier leads to sequentially consistent atomic access on variables even in code paths where atomicity and ordering is not needed (`opal_thread_*` and initializations as in `opal_object_t`...

Sigbus in UCX call inside opal_common_ucx_del_procs_nofence

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I'm consistently seeing a Sigbus (Signal 7) occuring in a call to `opal_common_ucx_del_procs_nofence` during shutdown on Hawk. I'm running Open MPI main (`v2.x-dev-9510-g7bb5fe1a2f`) with UCX 1.12.0. UCX is a system...

Implementation of the current state of MPI Continuations proposal [WIP]

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This PR adds an implementation of the MPI Continuations proposal as extension to Open MPI. This proposal is current under discussion in the MPI hybrid and accelerator working group. By...

btl/uct not compatible with AM RDMA?

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I am trying to run the example in https://github.com/open-mpi/ompi/issues/10328 with osc/rdma and btl/uct. My understanding is that this combination should work, but it doesn't. I run the example as follows:...

This PR adds `coll/smdirect`, a clone of `coll/sm` that relies on cross-process memory mapping as provided by XPMEM. In contrast to `coll/sm`, data is not copied into an intermediate buffer...

C11 Atomics: add relaxed load and store to avoid superfluous atomic instructions

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The C11 `_Atomic` qualifier requires accesses to such variables to be sequentially consistent [1], leading to unnecessary atomic operations in code paths where there cannot be concurrent accesses by other...

I am having trouble linking applications against an Open MPI configured with `--disable-shared --enable-static`. Here is what I get: ``` $ make -C mpi/pt2pt/ osu_bibw [...] /bin/bash ../../libtool --tag=CXX --mode=link...