database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-12 05:01:15 +03:00
Code Activity

Rearrange handling of MAXBACKENDS a little bit. The default setting

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

19
src/backend/postmaster/postmaster.c
View File

@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.102 1999/02/19 06:06:00 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.103 1999/02/21 01:41:43 tgl Exp $
*
* NOTES
*
@@ -162,14 +162,15 @@ static IpcMemoryKey ipc_key;
* adding to this.
*/
static int MaxBackends = MAXBACKENDS;
static int MaxBackends = DEF_MAXBACKENDS;
/*
* MaxBackends is the actual soft limit on the number of backends
* we will start. It defaults to the hard limit established at compilation
* time, but can be readjusted with postmaster's xxx switch.
* One reason to reduce MaxBackends is to allow startup under a kernel
* that won't let us get MAXBACKENDS semaphores!
* MaxBackends is the actual limit on the number of backends we will start.
* The default is established by configure, but it can be readjusted
* from 1..MAXBACKENDS with the postmaster -N switch.
* Note that a larger MaxBackends value will increase the size of the
* shared memory area as well as cause the postmaster to grab more
* kernel semaphores, even if you never actually use that many backends.
*/
static int NextBackendTag = MAXINT; /* XXX why count down not up? */
@@ -641,8 +642,8 @@ usage(const char *progname)
fprintf(stderr, "\t-b backend\tuse a specific backend server executable\n");
fprintf(stderr, "\t-d [1|2|3]\tset debugging level\n");
fprintf(stderr, "\t-i \t\tlisten on TCP/IP sockets as well as Unix domain socket\n");
fprintf(stderr, "\t-N nprocs\tset max number of backend servers (1..%d)\n",
MAXBACKENDS);
fprintf(stderr, "\t-N nprocs\tset max number of backends (1..%d, default %d)\n",
MAXBACKENDS, DEF_MAXBACKENDS);
fprintf(stderr, "\t-n \t\tdon't reinitialize shared memory after abnormal exit\n");
fprintf(stderr, "\t-o option\tpass 'option' to each backend servers\n");
fprintf(stderr, "\t-p port\tspecify port for postmaster to listen on\n");