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Basic planner and executor integration for JIT.

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This adds simple cost based plan time decision about whether JIT
should be performed. jit_above_cost, jit_optimize_above_cost are
compared with the total cost of a plan, and if the cost is above them
JIT is performed / optimization is performed respectively.

For that PlannedStmt and EState have a jitFlags (es_jit_flags) field
that stores information about what JIT operations should be performed.

EState now also has a new es_jit field, which can store a
JitContext. When there are no errors the context is released in
standard_ExecutorEnd().

It is likely that the default values for jit_[optimize_]above_cost
will need to be adapted further, but in my test these values seem to
work reasonably.

Author: Andres Freund, with feedback by Peter Eisentraut
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-03-22 11:45:07 -07:00
parent 7ec0d80c05
commit cc415a56d0
13 changed files with 72 additions and 0 deletions
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8
src/backend/executor/execMain.c
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@ -48,6 +48,7 @@
#include "commands/trigger.h"
#include "executor/execdebug.h"
#include "foreign/fdwapi.h"
#include "jit/jit.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "optimizer/clauses.h"
@ -249,6 +250,9 @@ standard_ExecutorStart(QueryDesc *queryDesc, int eflags)
estate->es_top_eflags = eflags;
estate->es_instrument = queryDesc->instrument_options;
if (queryDesc->plannedstmt)
estate->es_jit_flags = queryDesc->plannedstmt->jitFlags;
/*
* Set up an AFTER-trigger statement context, unless told not to, or
* unless it's EXPLAIN-only mode (when ExecutorFinish won't be called).
@ -496,6 +500,10 @@ standard_ExecutorEnd(QueryDesc *queryDesc)
UnregisterSnapshot(estate->es_snapshot);
UnregisterSnapshot(estate->es_crosscheck_snapshot);
/* release JIT context, if allocated */
if (estate->es_jit)
jit_release_context(estate->es_jit);
/*
* Must switch out of context before destroying it
*/