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23 results

xlog.c

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    • Heikki Linnakangas's avatar
      ad458cfe
      Don't use O_DIRECT when writing WAL files if archiving or streaming is · ad458cfe
      Heikki Linnakangas authored 
      enabled. Bypassing the kernel cache is counter-productive in that case,
because the archiver/walsender process will read from the WAL file
soon after it's written, and if it's not cached the read will cause
a physical read, eating I/O bandwidth available on the WAL drive.

Also, walreceiver process does unaligned writes, so disable O_DIRECT
in walreceiver process for that reason too.
      ad458cfe
      History
      Don't use O_DIRECT when writing WAL files if archiving or streaming is
      Heikki Linnakangas authored 
      enabled. Bypassing the kernel cache is counter-productive in that case,
because the archiver/walsender process will read from the WAL file
soon after it's written, and if it's not cached the read will cause
a physical read, eating I/O bandwidth available on the WAL drive.

Also, walreceiver process does unaligned writes, so disable O_DIRECT
in walreceiver process for that reason too.