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Enhancing Intel MPI Performance with OFA uDAPL: The Experience of Alexander Supalov

Learn how OFA uDAPL optimizes Intel MPI performance, achieving results close to native verbs with Mellanox and Qlogic setups. Ensure uDAPL's usability across platforms, streamline connection scaling, and address compatibility challenges for faster adoption rates.

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Enhancing Intel MPI Performance with OFA uDAPL: The Experience of Alexander Supalov

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  1. Intel MPI OFA Experience Alexander.Supalov@intel.com German.Voronov@intel.com Sean Hefty (don’t shoot the messenger)

  2. Performance • OFA uDAPL is the best fit for Intel MPI • uDAPL within 10% of native verbs • Mellanox: 2.8 vs. 2.6 usecs • Qlogic: 4.5 vs 4.1 usecs • The results are NetPipe uDAPL vs. verbs

  3. Usability • uDAPL compatibility required between Linux and Windows • Calling conventions must match • Interoperability testing needed • Need to know Endianess and size of keys • uDAPL requires IPoIB • Can we do without?

  4. Usability • Improve connection scaling • Longer timeouts • Faster connection setup • Want fewer user controls settable only by root • Is there a way to speed up distros adoption rate?

  5. uDAPL • uDAPL provider behavior differs from vendor to vendor • Intel MPI needs special treatment for each provider • Different interpretations of the DAT standard • iWarp: active side of connection must send the data first • Want support for uDAPL 2.0 spec with 1.x compatible library

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