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Replace the BufMgrLock with separate locks on the lookup hashtable and

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the freelist, plus per-buffer spinlocks that protect access to individual
shared buffer headers.  This requires abandoning a global freelist (since
the freelist is a global contention point), which shoots down ARC and 2Q
as well as plain LRU management.  Adopt a clock sweep algorithm instead.
Preliminary results show substantial improvement in multi-backend situations.
This commit is contained in:
Tom Lane
2005-03-04 20:21:07 +00:00
parent 5592a6cf46
commit 5d5087363d
18 changed files with 1410 additions and 1932 deletions
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6
src/backend/utils/misc/postgresql.conf.sample
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@ -99,8 +99,10 @@
# - Background writer -
#bgwriter_delay = 200 # 10-10000 milliseconds between rounds
#bgwriter_percent = 1 # 0-100% of dirty buffers in each round
#bgwriter_maxpages = 100 # 0-1000 buffers max per round
#bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers scanned in each round
#bgwriter_lru_maxpages = 5 # 0-1000 buffers max written per round
#bgwriter_all_percent = 0.333 # 0-100% of all buffers scanned in each round
#bgwriter_all_maxpages = 5 # 0-1000 buffers max written per round
#---------------------------------------------------------------------------