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Allow per-tablespace effective_io_concurrency

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Per discussion, nowadays it is possible to have tablespaces that have
wildly different I/O characteristics from others.  Setting different
effective_io_concurrency parameters for those has been measured to
improve performance.

Author: Julien Rouhaud
Reviewed by: Andres Freund
This commit is contained in:
Alvaro Herrera
2015-09-08 12:51:42 -03:00
parent 665a00c9e2
commit 1aba62ec63
12 changed files with 145 additions and 63 deletions
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16
src/backend/access/common/reloptions.c
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@ -254,6 +254,19 @@ static relopt_int intRelOpts[] =
},
-1, 64, MAX_KILOBYTES
},
{
{
"effective_io_concurrency",
"Number of simultaneous requests that can be handled efficiently by the disk subsystem.",
RELOPT_KIND_TABLESPACE,
AccessExclusiveLock
},
#ifdef USE_PREFETCH
-1, 0, MAX_IO_CONCURRENCY
#else
0, 0, 0
#endif
},
/* list terminator */
{{NULL}}
@ -1438,7 +1451,8 @@ tablespace_reloptions(Datum reloptions, bool validate)
int numoptions;
static const relopt_parse_elt tab[] = {
{"random_page_cost", RELOPT_TYPE_REAL, offsetof(TableSpaceOpts, random_page_cost)},
{"seq_page_cost", RELOPT_TYPE_REAL, offsetof(TableSpaceOpts, seq_page_cost)}
{"seq_page_cost", RELOPT_TYPE_REAL, offsetof(TableSpaceOpts, seq_page_cost)},
{"effective_io_concurrency", RELOPT_TYPE_INT, offsetof(TableSpaceOpts, effective_io_concurrency)}
};
options = parseRelOptions(reloptions, validate, RELOPT_KIND_TABLESPACE,