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Previously, when using parallel query, EXPLAIN (ANALYZE)'s JIT compilation timings did not include the overhead from doing so on the workers. Fix that. We do so by simply aggregating the cost of doing JIT compilation on workers and the leader together. Arguably that's not quite accurate, because the total time spend doing so is spent in parallel - but it's hard to do much better. For additional detail, when VERBOSE is specified, the stats for workers are displayed separately. Author: Amit Khandekar and Andres Freund Discussion: https://postgr.es/m/CAJ3gD9eLrz51RK_gTkod+71iDcjpB_N8eC6vU2AW-VicsAERpQ@mail.gmail.com Backpatch: 11-
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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* jit.h
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* Provider independent JIT infrastructure.
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*
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* Copyright (c) 2016-2018, PostgreSQL Global Development Group
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*
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* src/include/jit/jit.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef JIT_H
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#define JIT_H
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#include "executor/instrument.h"
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#include "utils/resowner.h"
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/* Flags determining what kind of JIT operations to perform */
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#define PGJIT_NONE 0
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#define PGJIT_PERFORM (1 << 0)
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#define PGJIT_OPT3 (1 << 1)
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#define PGJIT_INLINE (1 << 2)
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#define PGJIT_EXPR (1 << 3)
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#define PGJIT_DEFORM (1 << 4)
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typedef struct JitInstrumentation
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{
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/* number of emitted functions */
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size_t created_functions;
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/* accumulated time to generate code */
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instr_time generation_counter;
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/* accumulated time for inlining */
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instr_time inlining_counter;
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/* accumulated time for optimization */
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instr_time optimization_counter;
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/* accumulated time for code emission */
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instr_time emission_counter;
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} JitInstrumentation;
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/*
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* DSM structure for accumulating jit instrumentation of all workers.
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*/
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typedef struct SharedJitInstrumentation
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{
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int num_workers;
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JitInstrumentation jit_instr[FLEXIBLE_ARRAY_MEMBER];
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} SharedJitInstrumentation;
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typedef struct JitContext
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{
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/* see PGJIT_* above */
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int flags;
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ResourceOwner resowner;
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JitInstrumentation instr;
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} JitContext;
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typedef struct JitProviderCallbacks JitProviderCallbacks;
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extern void _PG_jit_provider_init(JitProviderCallbacks *cb);
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typedef void (*JitProviderInit) (JitProviderCallbacks *cb);
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typedef void (*JitProviderResetAfterErrorCB) (void);
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typedef void (*JitProviderReleaseContextCB) (JitContext *context);
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struct ExprState;
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typedef bool (*JitProviderCompileExprCB) (struct ExprState *state);
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struct JitProviderCallbacks
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{
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JitProviderResetAfterErrorCB reset_after_error;
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JitProviderReleaseContextCB release_context;
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JitProviderCompileExprCB compile_expr;
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};
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/* GUCs */
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extern bool jit_enabled;
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extern char *jit_provider;
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extern bool jit_debugging_support;
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extern bool jit_dump_bitcode;
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extern bool jit_expressions;
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extern bool jit_profiling_support;
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extern bool jit_tuple_deforming;
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extern double jit_above_cost;
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extern double jit_inline_above_cost;
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extern double jit_optimize_above_cost;
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extern void jit_reset_after_error(void);
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extern void jit_release_context(JitContext *context);
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/*
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* Functions for attempting to JIT code. Callers must accept that these might
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* not be able to perform JIT (i.e. return false).
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*/
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extern bool jit_compile_expr(struct ExprState *state);
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extern void InstrJitAgg(JitInstrumentation *dst, JitInstrumentation *add);
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#endif /* JIT_H */
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