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Add infrastructure for making spins_per_delay variable depending on

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whether we seem to be running in a uniprocessor or multiprocessor.
The adjustment rules could probably still use further tweaking, but
I'm convinced this should be a win overall.
This commit is contained in:
Tom Lane
2005-10-11 20:41:32 +00:00
parent 9907b9775b
commit a72ee09090
4 changed files with 145 additions and 24 deletions
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38
src/backend/storage/lmgr/proc.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.164 2005/09/19 17:21:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.165 2005/10/11 20:41:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -171,6 +171,8 @@ InitProcGlobal(void)
ProcGlobal->freeProcs = INVALID_OFFSET;
ProcGlobal->spins_per_delay = DEFAULT_SPINS_PER_DELAY;
/*
* Pre-create the PGPROC structures and create a semaphore for
* each.
@@ -225,9 +227,14 @@ InitProcess(void)
/*
* Try to get a proc struct from the free list. If this fails, we
* must be out of PGPROC structures (not to mention semaphores).
*
* While we are holding the ProcStructLock, also copy the current
* shared estimate of spins_per_delay to local storage.
*/
SpinLockAcquire(ProcStructLock);
set_spins_per_delay(procglobal->spins_per_delay);
myOffset = procglobal->freeProcs;
if (myOffset != INVALID_OFFSET)
@@ -319,21 +326,38 @@ InitDummyProcess(int proctype)
Assert(proctype >= 0 && proctype < NUM_DUMMY_PROCS);
/*
* Just for paranoia's sake, we use the ProcStructLock to protect
* assignment and releasing of DummyProcs entries.
*
* While we are holding the ProcStructLock, also copy the current
* shared estimate of spins_per_delay to local storage.
*/
SpinLockAcquire(ProcStructLock);
set_spins_per_delay(ProcGlobal->spins_per_delay);
dummyproc = &DummyProcs[proctype];
/*
* dummyproc should not presently be in use by anyone else
*/
if (dummyproc->pid != 0)
{
SpinLockRelease(ProcStructLock);
elog(FATAL, "DummyProc[%d] is in use by PID %d",
proctype, dummyproc->pid);
}
MyProc = dummyproc;
MyProc->pid = MyProcPid; /* marks dummy proc as in use by me */
SpinLockRelease(ProcStructLock);
/*
* Initialize all fields of MyProc, except MyProc->sem which was set
* up by InitProcGlobal.
*/
MyProc->pid = MyProcPid; /* marks dummy proc as in use by me */
SHMQueueElemInit(&(MyProc->links));
MyProc->waitStatus = STATUS_OK;
MyProc->xid = InvalidTransactionId;
@@ -510,6 +534,9 @@ ProcKill(int code, Datum arg)
/* PGPROC struct isn't mine anymore */
MyProc = NULL;
/* Update shared estimate of spins_per_delay */
procglobal->spins_per_delay = update_spins_per_delay(procglobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
}
@@ -533,11 +560,18 @@ DummyProcKill(int code, Datum arg)
/* Release any LW locks I am holding (see notes above) */
LWLockReleaseAll();
SpinLockAcquire(ProcStructLock);
/* Mark dummy proc no longer in use */
MyProc->pid = 0;
/* PGPROC struct isn't mine anymore */
MyProc = NULL;
/* Update shared estimate of spins_per_delay */
ProcGlobal->spins_per_delay = update_spins_per_delay(ProcGlobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
}