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Data Access – Performance in Remote I/O

Data Access – Performance in Remote I/O. Martin Hellmich ( on behalf of the LCGDM team ). EMI INFSO-RI-261611. Frontends: Random I/O Performance. 200x slower. HTTP/DAV vs XROOTD vs RFIO Soon adding NFS 4.1 / pNFS to the comparison. Frontends: Random I/O Performance.

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Data Access – Performance in Remote I/O

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  1. Data Access – Performance in Remote I/O Martin Hellmich ( on behalf of the LCGDM team ) EMI INFSO-RI-261611

  2. Frontends: Random I/O Performance 200x slower • HTTP/DAV vs XROOTD vs RFIO • Soon adding NFS 4.1 / pNFS to the comparison 2

  3. Frontends: Random I/O Performance 3 • HTTP/DAV vs XROOTD vs RFIO • Soon adding NFS 4.1 / pNFS to the comparison

  4. Frontends: Random I/O Performance 4 • HTTP/DAV vs XROOTD vs RFIO • Soon adding NFS 4.1 / pNFS to the comparison

  5. Frontends: Hammercloud • We’ve also run a set of Hammercloud tests • Using ATLAS analysis jobs • These are only a few of all the metrics we have 5

  6. Performance: Showdown • Big thanks to ShuTing and ASGC • For doing a lot of the testing and providing the infrastructure • First recommendation is to phase down RFIO • No more development effort on it from our side • HTTP vs XROOTD • Performance is equivalent, up to sites/users to decide • But we like standards… there’s a lot to gain with them • Staging vs Direct Access • Staging not ideal… requires lots of extra space on the WN • Direct Access is performant if used with ROOT TTreeCache 6

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