database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-16 06:01:02 +03:00
Code Activity

Parallel executor support.

Browse Source 
This code provides infrastructure for a parallel leader to start up
parallel workers to execute subtrees of the plan tree being executed
in the master.  User-supplied parameters from ParamListInfo are passed
down, but PARAM_EXEC parameters are not.  Various other constructs,
such as initplans, subplans, and CTEs, are also not currently shared.
Nevertheless, there's enough here to support a basic implementation of
parallel query, and we can lift some of the current restrictions as
needed.

Amit Kapila and Robert Haas
This commit is contained in:
Robert Haas
2015-09-28 21:55:57 -04:00
parent 0557dc276f
commit d1b7c1ffe7
17 changed files with 1007 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/include/executor/execParallel.h Normal file
View File

@ -0,0 +1,36 @@
/*--------------------------------------------------------------------
* execParallel.h
* POSTGRES parallel execution interface
*
* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/executor/execParallel.h
*--------------------------------------------------------------------
*/
#ifndef EXECPARALLEL_H
#define EXECPARALLEL_H
#include "access/parallel.h"
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
typedef struct SharedExecutorInstrumentation SharedExecutorInstrumentation;
typedef struct ParallelExecutorInfo
{
PlanState *planstate;
ParallelContext *pcxt;
BufferUsage *buffer_usage;
SharedExecutorInstrumentation *instrumentation;
shm_mq_handle **tqueue;
} ParallelExecutorInfo;
extern ParallelExecutorInfo *ExecInitParallelPlan(PlanState *planstate,
EState *estate, int nworkers);
extern void ExecParallelFinish(ParallelExecutorInfo *pei);
#endif /* EXECPARALLEL_H */