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LMDB write performance on Linux

Quanah noted a few times in IRC that LMDB write performance was a lot slower after upgrading from Linux 2.6.x to 3.x. I've also observed some major slowdowns on an Ubuntu 3.5.0-23 kernel whenever the dirty page flusher is active. Apparently this is a known issue introduced in the 3.0 kernel series


I'm told that this has been fixed as of Linux 3.10. Unfortunately our most recent round of benchmarks has all been run on our 3.5.0-23 system. The SLAMD results we obtained for LMDB Modify throughput (tested back in February this year) are only about 60% of the speed we expected.


  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/