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Allow the wal_buffers setting to be auto-tuned to a reasonable value.

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If wal_buffers is initially set to -1 (which is now the default), it's
replaced by 1/32nd of shared_buffers, with a minimum of 8 (the old default)
and a maximum of the XLOG segment size.  The allowed range for manual
settings is still from 4 up to whatever will fit in shared memory.

Greg Smith, with implementation correction by me.
This commit is contained in:
Tom Lane
2011-01-22 20:31:24 -05:00
parent 518b1e96c0
commit 0f73aae13d
4 changed files with 61 additions and 9 deletions
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2
src/backend/utils/misc/postgresql.conf.sample
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@ -162,7 +162,7 @@
# fsync_writethrough
# open_sync
#full_page_writes = on # recover from partial page writes
#wal_buffers = 64kB # min 32kB
#wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds