Paul Coffman

ROMIO: utilization of multiple threads for collective IO aggregation algorithms

4

With the work going on for enhanced CH4 multi-threading it has become apparent to me, at least in the case of the ROMIO one-sided collective aggregation algorithm, that multi-threading can...

bug: ch4 memory corruption in MPI_Datatype management exposed by GA

3

The NWChem application utilizes global arrays (GA) communication for PGAS. NWChem has historically had very bad performance on BGQ using mpich-pamid for the GA, so I would like to get...

Performance issue in ROMIO collective buffer aggregation for Parallel HDF5 on sunspot

3

Using the mpich build 'mpich/20231026/icc-all-pmix-gpu' on sunspot and using darshan and vtune for performance analysis I am seeing what appears to be very bad performance in the messaging layer for...

Using the mpich build 'mpich/20231026/icc-all-pmix-gpu' on sunspot I am seeing the following error: free(): double free detected in tcache 2 Usng the HDF5 h5bench exerciser benchmark which uses collective MPI-IO...

MPI-IO (ROMIO) collective buffering performance bottleneck on Aurora

3

I have a test using IOR that shows a major performance bottleneck in the communication layer on Aurora for MPI-IO collective buffering, particularly on the read, possibly related to the...