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authorRobert Haas <rhaas@postgresql.org>2010-11-15 12:42:59 -0500
committerRobert Haas <rhaas@postgresql.org>2010-11-15 12:42:59 -0500
commit3134d8863e8473e3ed791e27d484f9e548220411 (patch)
tree57892334bf423c03ac4d69265ea15adc31977af0 /src/backend/access/gist/gistutil.c
parent8d70ed84ba577abf9e985518024fb92e2081dac9 (diff)
downloadpostgresql-3134d8863e8473e3ed791e27d484f9e548220411.tar.gz
postgresql-3134d8863e8473e3ed791e27d484f9e548220411.zip
Add new buffers_backend_fsync field to pg_stat_bgwriter.
This new field counts the number of times that a backend which writes a buffer out to the OS must also fsync() it. This happens when the bgwriter fsync request queue is full, and is generally detrimental to performance, so it's good to know when it's happening. Along the way, log a new message at level DEBUG1 whenever we fail to hand off an fsync, so that the problem can also be seen in examination of log files (if the logging level is cranked up high enough). Greg Smith, with minor tweaks by me.
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