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Rearrange handling of MAXBACKENDS a little bit. The default setting

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of MAXBACKENDS is now 1024, since all it's costing is about 32 bytes of memory
per array slot.  configure's --with-maxbackends switch now controls DEF_MAXBACKENDS
which is simply the default value of the postmaster's -N switch.  Thus,
the out-of-the-box configuration will still limit you to 64 backends,
but you can go up to 1024 backends simply by restarting the postmaster with
a different -N switch --- no rebuild required.
This commit is contained in:
Tom Lane
1999-02-21 01:41:55 +00:00
parent 75cccd0ad3
commit 9d197856dd
10 changed files with 78 additions and 67 deletions
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11
src/backend/storage/ipc/ipc.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.35 1999/02/13 23:18:09 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.36 1999/02/21 01:41:44 tgl Exp $
*
* NOTES
*
@@ -677,9 +677,10 @@ struct ipcdummy
SLock *free;
int unused;
slock_t memlock;
SLock slocks[NSLOCKS];
SLock slocks[MAX_SPINS + 1];
};
static int SLockMemorySize = sizeof(struct ipcdummy);
#define SLOCKMEMORYSIZE sizeof(struct ipcdummy)
void
CreateAndInitSLockMemory(IPCKey key)
@@ -688,7 +689,7 @@ CreateAndInitSLockMemory(IPCKey key)
SLock *slckP;
SLockMemoryId = IpcMemoryCreate(key,
SLockMemorySize,
SLOCKMEMORYSIZE,
0700);
AttachSLockMemory(key);
*FreeSLockPP = NULL;
@@ -713,7 +714,7 @@ AttachSLockMemory(IPCKey key)
struct ipcdummy *slockM;
if (SLockMemoryId == -1)
SLockMemoryId = IpcMemoryIdGet(key, SLockMemorySize);
SLockMemoryId = IpcMemoryIdGet(key, SLOCKMEMORYSIZE);
if (SLockMemoryId == -1)
elog(FATAL, "SLockMemory not in shared memory");
slockM = (struct ipcdummy *) IpcMemoryAttach(SLockMemoryId);

11
src/backend/storage/ipc/ipci.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.20 1999/02/19 07:10:47 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.21 1999/02/21 01:41:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -72,7 +72,7 @@ CreateSharedMemoryAndSemaphores(IPCKey key, int maxBackends)
* ----------------
*/
CreateSpinlocks(IPCKeyGetSpinLockSemaphoreKey(key));
size = BufferShmemSize() + LockShmemSize();
size = BufferShmemSize() + LockShmemSize(maxBackends);
#ifdef STABLE_MEMORY_STORAGE
size += MMShmemSize();
@@ -113,15 +113,13 @@ CreateSharedMemoryAndSemaphores(IPCKey key, int maxBackends)
void
AttachSharedMemoryAndSemaphores(IPCKey key)
{
int size;
/* ----------------
* create rather than attach if using private key
* ----------------
*/
if (key == PrivateIPCKey)
{
CreateSharedMemoryAndSemaphores(key, 1);
CreateSharedMemoryAndSemaphores(key, 16);
return;
}
@@ -136,8 +134,7 @@ AttachSharedMemoryAndSemaphores(IPCKey key)
* attach the buffer manager buffer pool (and semaphore)
* ----------------
*/
size = BufferShmemSize() + LockShmemSize();
InitShmem(key, size);
InitShmem(key, 0);
InitBufferPool(key);
/* ----------------