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| author | Andres Freund <andres@anarazel.de> | 2018-03-26 12:57:19 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2018-03-26 12:57:19 -0700 |
| commit | 32af96b2b118cd204ca809d7c48c7f8ea7f879cf (patch) | |
| tree | d9a09cc42afb193293a0b65cfa080d676763d776 /src/backend/utils/misc/guc.c | |
| parent | 64f85894ad2730fb1449a8e81dd8026604e9a546 (diff) | |
| download | postgresql-32af96b2b118cd204ca809d7c48c7f8ea7f879cf.tar.gz | |
JIT tuple deforming in LLVM JIT provider.
Performing JIT compilation for deforming gains performance benefits
over unJITed deforming from compile-time knowledge of the tuple
descriptor. Fixed column widths, NOT NULLness, etc can be taken
advantage of.
Right now the JITed deforming is only used when deforming tuples as
part of expression evaluation (and obviously only if the descriptor is
known). It's likely to be beneficial in other cases, too.
By default tuple deforming is JITed whenever an expression is JIT
compiled. There's a separate boolean GUC controlling it, but that's
expected to be primarily useful for development and benchmarking.
Docs will follow in a later commit containing docs for the whole JIT
feature.
Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
Diffstat (limited to 'src/backend/utils/misc/guc.c')
| -rw-r--r-- | src/backend/utils/misc/guc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c index e6d79873dd..d075cb139a 100644 --- a/src/backend/utils/misc/guc.c +++ b/src/backend/utils/misc/guc.c @@ -1788,6 +1788,17 @@ static struct config_bool ConfigureNamesBool[] = NULL, NULL, NULL }, + { + {"jit_tuple_deforming", PGC_USERSET, DEVELOPER_OPTIONS, + gettext_noop("Allow JIT compilation of tuple deforming."), + NULL, + GUC_NOT_IN_SAMPLE + }, + &jit_tuple_deforming, + true, + NULL, NULL, NULL + }, + /* End-of-list marker */ { {NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL |