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| author | Tom Lane <tgl@sss.pgh.pa.us> | 1999-02-21 01:41:55 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 1999-02-21 01:41:55 +0000 |
| commit | 9d197856dd5eda5cf85b15e564ae09ef8fef0e9e (patch) | |
| tree | ac85492fb01823aeb836e54f5e5511366346f418 /src/backend/storage/lmgr/proc.c | |
| parent | 75cccd0ad3184e3fa283f407c765520d3c774c86 (diff) | |
| download | postgresql-9d197856dd5eda5cf85b15e564ae09ef8fef0e9e.tar.gz postgresql-9d197856dd5eda5cf85b15e564ae09ef8fef0e9e.zip | |
Rearrange handling of MAXBACKENDS a little bit. The default setting
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.
Diffstat (limited to 'src/backend/storage/lmgr/proc.c')
| -rw-r--r-- | src/backend/storage/lmgr/proc.c | 41 |
1 files changed, 23 insertions, 18 deletions
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c index 7452270fdf4..2bb66c09d6a 100644 --- a/src/backend/storage/lmgr/proc.c +++ b/src/backend/storage/lmgr/proc.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.50 1999/02/19 07:10:48 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.51 1999/02/21 01:41:45 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -46,7 +46,7 @@ * This is so that we can support more backends. (system-wide semaphore * sets run out pretty fast.) -ay 4/95 * - * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.50 1999/02/19 07:10:48 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.51 1999/02/21 01:41:45 tgl Exp $ */ #include <sys/time.h> #include <unistd.h> @@ -154,23 +154,28 @@ InitProcGlobal(IPCKey key, int maxBackends) */ on_shmem_exit(ProcFreeAllSemaphores, NULL); - /* Pre-create the semaphores for the first maxBackends processes */ - for (i = 0; - i < (maxBackends+PROC_NSEMS_PER_SET-1) / PROC_NSEMS_PER_SET; - i++) + /* Pre-create the semaphores for the first maxBackends processes, + * unless we are running as a standalone backend. + */ + if (key != PrivateIPCKey) { - IPCKey semKey = ProcGlobal->currKey + i; - int semId; - int semstat; - - semId = IpcSemaphoreCreate(semKey, - PROC_NSEMS_PER_SET, - IPCProtection, - IpcSemaphoreDefaultStartValue, - 0, - &semstat); - /* mark this sema set allocated */ - ProcGlobal->freeSemMap[i] = (1 << PROC_NSEMS_PER_SET); + for (i = 0; + i < (maxBackends+PROC_NSEMS_PER_SET-1) / PROC_NSEMS_PER_SET; + i++) + { + IPCKey semKey = ProcGlobal->currKey + i; + int semId; + int semstat; + + semId = IpcSemaphoreCreate(semKey, + PROC_NSEMS_PER_SET, + IPCProtection, + IpcSemaphoreDefaultStartValue, + 0, + &semstat); + /* mark this sema set allocated */ + ProcGlobal->freeSemMap[i] = (1 << PROC_NSEMS_PER_SET); + } } } } |