Mark Kirkwood wrote:
Rebuilt with 256K chunksize:
transaction type: TPC-B (sort of)
scaling factor: 100
number of clients: 24
number of transactions per client: 12000
number of transactions actually processed: 288000/288000
tps = 942.852104 (including connections establishing)
tps = 943.019223 (excluding connections establishing)
Increasing checkpoint_segments to 96 and decreasing
bgwriter_lru_maxpages to 100:
transaction type: TPC-B (sort of)
scaling factor: 100
number of clients: 24
number of transactions per client: 12000
number of transactions actually processed: 288000/288000
tps = 1219.221721 (including connections establishing)
tps = 1219.501150 (excluding connections establishing)
... as suggested by Greg (actually he suggested reducing
bgwriter_lru_maxpages to 0, but this seemed to be no better). Anyway,
seeing quite a reasonable improvement (about 83% from where we started).
It will be interesting to see how/if the improvements measured in
pgbench translate into the "real" application. Thanks for all your help
(particularly to both Scotts, Greg and Stef).
regards
Mark
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