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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/ipci.c
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@@ -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);
/* ----------------