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Dear all, The HACC WG will meet this week for a presentation and discussion of cMPI by Jongryool Kim. Please see the title and abstract below. As always, we’re meeting at 10am ET and the connection info is available at [1]. Cheers Joseph [1]</div>
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<meta charset="UTF-8"></head><body><pre style="font-family: sans-serif; font-size: 100%; white-space: pre-wrap; word-wrap: break-word">Dear all,
The HACC WG will meet this week for a presentation and discussion of
cMPI by Jongryool Kim. Please see the title and abstract below. As
always, we’re meeting at 10am ET and the connection info is available at
[1].
Cheers
Joseph
[1] <a href="https://urldefense.us/v3/__https://github.com/mpiwg-hybrid/mpi-standard/wiki__;!!G_uCfscf7eWS!e2d2NgAFn3IX-DkekWvUl08gtIfjJLGhZZJid6oYwbfmV7ydMActG2RhR-2veA_UzPTm2H14UgoGVbXzzZsFH6EUCrcdk-ZDV7hh9I2DCAdLplC4$">https://urldefense.us/v3/__https://github.com/mpiwg-hybrid/mpi-standard/wiki__;!!G_uCfscf7eWS!e2d2NgAFn3IX-DkekWvUl08gtIfjJLGhZZJid6oYwbfmV7ydMActG2RhR-2veA_UzPTm2H14UgoGVbXzzZsFH6EUCrcdk-ZDV7hh9I2DCAdLplC4$</a>
Title: cMPI: Using CXL Memory Sharing for MPI One-Sided and Two-Sided
Inter-Node Communications
Abstract:
Message Passing Interface (MPI) is a foundational programming model for
high-performance computing. MPI libraries traditionally employ network
interconnects (e.g., Ethernet and InfiniBand) and network protocols
(e.g., TCP and RoCE) with complex software stacks for cross-node
communication. We present cMPI, the first work to optimize MPI
point-to-point communication (both one-sided and two-sided) using CXL
memory sharing on a real CXL platform, transforming cross-node
communication into memory transactions and data copies within CXL
memory, bypassing traditional network protocols. We analyze performance
across various interconnects and find that CXL memory sharing achieves
7.2-8.1x lower latency than TCP-based interconnects deployed in small-
and medium-scale clusters. We address challenges of CXL memory sharing
for MPI communication, including data object management over the dax
representation, cache coherence, and atomic operations. Overall, cMPI
outperforms TCP over standard Ethernet NIC and high-end SmartNIC by up
to 49x and 72x in latency and bandwidth, respectively, for small messages.
​
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