HPC Advisory Council: 8-byte host-memory MPI latency on the EPYC Rome Daytona_X / ConnectX-6 HDR test
1.07 µsobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Historical 8-byte host-memory MPI ping-pong mean, not p99, GPU-memory latency or a RoCE comparison. Daytona_X / EPYC Rome / ConnectX-6 HDR; OSU 5.6.2, HPC-X 2.7.0, OFED 5.0.2; local core 80, 10,000 timed/warm-up iterations. |
| As of | 2020-07-30 |
| Source | HPC Advisory Council, Ophir Maor, OSU HDR benchmark, updated July 30, 2020. · OSU Point to Point Tests → osu_latency → command output example on Rome (HDR), Size 8 row: 1.07 us. |
| Review | checking…review by 2027-07-30 · standard cadence |
| Recorded changes | last 2026-09-16 · 3 revisions tracked |
| Claim id | infiniband-end-to-end-latency-tuned-rocev2-1-5 |
Where the guide uses it
- 8.1 Network Fundamentals & AI Traffic Characterization
- 8.4 Scale-Out Fabric: Protocols, Standards & Transport
- 8.6 Congestion Control, Load Balancing & In-Network Compute
- 13.7 Network Fabric Commissioning & Validation
← Full numbers register — every date-stamped figure in the guide, with revision history.