Jiakun Yan

Optimization on LCI parcelport: uses LCI_putva

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### Background LCI_putva: put iovec allocate - LCI_putva transfers an `iovec`, which includes one medium message and multiple long messages. - It is a one-sided put operation, which means the...

HPX distributed barrier runs into assertion error

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## Expected Behavior The `hpx::distributed::barrier::synchronize()` runs successfully. ## Actual Behavior It gets into an assertion error ``` {file}: /home/jiakuny/workspace/hpx-master/libs/full/collectives/src/barrier.cpp {line}: 210 {function}: static void hpx::distributed::barrier::synchronize() {what}: Assertion 'b[0].node_ && b[1].node_'...

HPX does not compile with G++ version prior to 9.3.

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## Expected Behavior Compile successfully for any compilers supporting c++17. ## Actual Behavior G++ 8.5 gave me an error `error: expected unqualified-id before '[' token` ## Steps to Reproduce the...

MPICH building error: simple/lib: No such file or directory

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Version: the current master branch (7953471529c874df89cb08dd782431ac849d8b02) Platform: LSU Rostam (with Infiniband). Spack spec: `mpich+vci+slurm~hydra netmod=ucx` Configure (copied from spack's build log): > Configuring MPICH version 4.3.0a1 with '--prefix=/home/jiakun/workspace/spack/opt/spack/linux-rhel8-skylake_avx512/gcc-12.3.0/mpich-master-xyhqb6pqkytgpql3nf7p4bjqtoljpuv6' '--disable-silent-rules' '--enable-shared'...

Below is a code that reproduces this error. ``` #include #include "mpi.h" int main() { setenv("MPIR_CVAR_CH4_RESERVE_VCIS", "1", true); int rank, nranks; MPI_Init(nullptr, nullptr); MPI_Comm_size(MPI_COMM_WORLD, &nranks); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPIX_Stream stream; MPI_Comm...

HPX performance counters not found

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## Expected Behavior Octo-Tiger completes. ## Actual Behavior Octo-Tiger (or HPX) occasionally complains some performance counters are not found. ## Steps to Reproduce the Problem Run Octo-Tiger with the following...

lci: new package

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Add a new package to the Spack built-in repo: lci. The Lightweight Communication Interface (LCI) is designed to be an efficient communication library for multithreaded, irregular communications.

PMI error when running on SDSC Expanse

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I am getting the following error when trying to run MPICH on SDSC Expanse (Infiniband machine with slurm). > srun -n 2 hello_world PMII_singinit: execv failed: No such file or...

More verbose error message when the request pools run out of space

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I am doing a message rate benchmark on MPICH with a super large send window (500k) using various numbers of VCIs. I found when I used more communicators than VCIs,...

MPIX_Continue: the basic implementation

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## Pull Request Description The basic implementation of the MPIX continuation proposal (https://github.com/mpiwg-hybrid/hybrid-issues/issues/6). A brief overview: it introduces a new way to attach a callback function (named _continuation_) to a...