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Introduce a maintenance_io_concurrency setting.

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Introduce a GUC and a tablespace option to control I/O prefetching, much
like effective_io_concurrency, but for work that is done on behalf of
many client sessions.

Use the new setting in heapam.c instead of the hard-coded formula
effective_io_concurrency + 10 introduced by commit 558a9165e0.  Go with
a default value of 10 for now, because it's a round number pretty close
to the value used for that existing case.

Discussion: https://postgr.es/m/CA%2BhUKGJUw08dPs_3EUcdO6M90GnjofPYrWp4YSLaBkgYwS-AqA%40mail.gmail.com
This commit is contained in:
Thomas Munro
2020-03-16 12:31:34 +13:00
parent b09ff53667
commit fc34b0d9de
12 changed files with 109 additions and 23 deletions
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src/include/commands/tablespace.h
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@@ -40,6 +40,7 @@ typedef struct TableSpaceOpts
float8 random_page_cost;
float8 seq_page_cost;
int effective_io_concurrency;
int maintenance_io_concurrency;
} TableSpaceOpts;
extern Oid CreateTableSpace(CreateTableSpaceStmt *stmt);