* Portions Copyright (c) 1994, Regents of the University of California
* Portions taken from FreeBSD.
*
- * $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.102 2005/12/27 23:54:01 adunstan Exp $
+ * $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.103 2005/12/31 23:50:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
static void check_input(char *path);
static void set_short_version(char *short_version, char *extrapath);
static void set_null_conf(void);
-static void test_connections(void);
-static void test_buffers(void);
+static void test_config_settings(void);
static void setup_config(void);
static void bootstrap_template1(char *short_version);
static void setup_auth(void);
}
/*
- * set up an empty config file so we can check buffers and connections
+ * set up an empty config file so we can check config settings by launching
+ * a test backend
*/
static void
set_null_conf(void)
}
/*
- * max_fsm_pages setting used in both the shared_buffers and max_connections
- * tests.
- */
-
-#define TEST_FSM(x) ( (x) > 1000 ? 50 * (x) : 20000 )
-
-/*
- * check how many connections we can sustain
+ * Determine platform-specific config settings
+ *
+ * Use reasonable values if kernel will let us, else scale back. Probe
+ * for max_connections first since it is subject to more constraints than
+ * shared_buffers.
*/
static void
-test_connections(void)
+test_config_settings(void)
{
+ /*
+ * These macros define the minimum shared_buffers we want for a given
+ * max_connections value, and the max_fsm_pages setting to be used for
+ * a given shared_buffers value. The arrays show the settings to try.
+ *
+ * Make sure the trial_bufs[] list includes the MIN_BUFS_FOR_CONNS()
+ * value for each trial_conns[] entry, else we may end up setting
+ * shared_buffers lower than it could be.
+ */
+#define MIN_BUFS_FOR_CONNS(nconns) ((nconns) * 10)
+#define FSM_FOR_BUFS(nbuffers) ((nbuffers) > 1000 ? 50 * (nbuffers) : 20000)
+
+ static const int trial_conns[] = {
+ 100, 50, 40, 30, 20, 10
+ };
+ static const int trial_bufs[] = {
+ 4000, 3500, 3000, 2500, 2000, 1500,
+ 1000, 900, 800, 700, 600, 500,
+ 400, 300, 200, 100, 50
+ };
+
char cmd[MAXPGPATH];
- static const int conns[] = {100, 50, 40, 30, 20, 10};
- static const int len = sizeof(conns) / sizeof(int);
+ const int connslen = sizeof(trial_conns) / sizeof(int);
+ const int bufslen = sizeof(trial_bufs) / sizeof(int);
int i,
- status;
+ status,
+ test_conns,
+ test_buffs,
+ test_max_fsm;
printf(_("selecting default max_connections ... "));
fflush(stdout);
- for (i = 0; i < len; i++)
+ for (i = 0; i < connslen; i++)
{
- int test_buffs = conns[i] * 5;
- int test_max_fsm = TEST_FSM(test_buffs);
+ test_conns = trial_conns[i];
+ test_buffs = MIN_BUFS_FOR_CONNS(test_conns);
+ test_max_fsm = FSM_FOR_BUFS(test_buffs);
snprintf(cmd, sizeof(cmd),
"%s\"%s\" -boot -x0 %s "
+ "-c max_connections=%d "
+ "-c shared_buffers=%d "
"-c max_fsm_pages=%d "
- "-c shared_buffers=%d -c max_connections=%d template1 "
- "< \"%s\" > \"%s\" 2>&1%s",
+ "template1 < \"%s\" > \"%s\" 2>&1%s",
SYSTEMQUOTE, backend_exec, boot_options,
- test_max_fsm,
- test_buffs, conns[i],
+ test_conns, test_buffs, test_max_fsm,
DEVNULL, DEVNULL, SYSTEMQUOTE);
status = system(cmd);
if (status == 0)
break;
}
- if (i >= len)
- i = len - 1;
- n_connections = conns[i];
+ if (i >= connslen)
+ i = connslen - 1;
+ n_connections = trial_conns[i];
printf("%d\n", n_connections);
-}
-
-/*
- * check how many buffers we can run with
- */
-static void
-test_buffers(void)
-{
- char cmd[MAXPGPATH];
- static const int bufs[] = {
- 4000, 3500, 3000, 2500, 2000, 1500,
- 1000, 900, 800, 700, 600, 500,
- 400, 300, 200, 100, 50
- };
- static const int len = sizeof(bufs) / sizeof(int);
- int i,
- status,
- test_max_fsm_pages;
printf(_("selecting default shared_buffers/max_fsm_pages ... "));
fflush(stdout);
- for (i = 0; i < len; i++)
+ for (i = 0; i < bufslen; i++)
{
- test_max_fsm_pages = TEST_FSM(bufs[i]);
+ test_buffs = trial_bufs[i];
+ test_max_fsm = FSM_FOR_BUFS(test_buffs);
snprintf(cmd, sizeof(cmd),
"%s\"%s\" -boot -x0 %s "
+ "-c max_connections=%d "
+ "-c shared_buffers=%d "
"-c max_fsm_pages=%d "
- "-c shared_buffers=%d -c max_connections=%d template1 "
- "< \"%s\" > \"%s\" 2>&1%s",
+ "template1 < \"%s\" > \"%s\" 2>&1%s",
SYSTEMQUOTE, backend_exec, boot_options,
- test_max_fsm_pages,
- bufs[i], n_connections,
+ n_connections, test_buffs, test_max_fsm,
DEVNULL, DEVNULL, SYSTEMQUOTE);
status = system(cmd);
if (status == 0)
break;
}
- if (i >= len)
- i = len - 1;
- n_buffers = bufs[i];
- n_fsm_pages = test_max_fsm_pages;
+ if (i >= bufslen)
+ i = bufslen - 1;
+ n_buffers = trial_bufs[i];
+ n_fsm_pages = FSM_FOR_BUFS(n_buffers);
printf("%d/%d\n", n_buffers, n_fsm_pages);
}
/* Top level PG_VERSION is checked by bootstrapper, so make it first */
set_short_version(short_version, NULL);
- /*
- * Determine platform-specific config settings
- *
- * Use reasonable values if kernel will let us, else scale back. Probe
- * for max_connections first since it is subject to more constraints than
- * shared_buffers.
- */
-
+ /* Select suitable configuration settings */
set_null_conf();
-
- test_connections();
- test_buffers();
+ test_config_settings();
/* Now create all the text config files */
setup_config();
projects / postgresql.git / commitdiff