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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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7
src/backend/storage/buffer/bufmgr.c
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@ -119,6 +119,13 @@ bool track_io_timing = false;
*/
int effective_io_concurrency = 0;
/*
* Like effective_io_concurrency, but used by maintenance code paths that might
* benefit from a higher setting because they work on behalf of many sessions.
* Overridden by the tablespace setting of the same name.
*/
int maintenance_io_concurrency = 0;
/*
* GUC variables about triggering kernel writeback for buffers written; OS
* dependent defaults are set via the GUC mechanism.