er patch attached this time
Andrew Dunstan wrote:
I wrote:
Tom Lane wrote:
Andrew Dunstan <[EMAIL PROTECTED]> writes:
Nearly everyone seems to agree that the default for max_fsm_pages
is woefully low, so I would like to have the default for this set
unconditionally to 200,000 rather than 20,000. The cost would be
just over 1Mb of shared memory, if the docs are correct.
Alternatively, we could put this into the mix that is calculated by
initdb, scaling it linearly with shared_buffers (but with the
default still at 200,000).
I would also like to propose a more modest increase in
max_connections and shared_buffers by a factor of 3.
I don't mind having initdb try larger values to see if they work, but
if you are suggesting that we try to force adoption of larger settings
I'll resist it.
OK, works for me. The only thing I suggested might be set in stone
was max_fsm_pages; I always envisioned the others being tested as now
by initdb.
"Factor of three" seems mighty weird. The existing numbers (100 and
1000)
at least have the defensibility of being round.
What numbers would you like? If what I suggested seems odd, how about
targets of 400 connections, 4000 shared_buffers and 200,000
max_fsm_pages?
Here's a patch that does what I had in mind. On my modest workstation
it tops out at 400 connections and 2500/125000
shared_buffers/max_fsm_pages. An idle postmaster with these settings
consumed less than 4% of the 380Mb of memory, according to top, making
it still dwarfed by X, mozilla, apache and amavisd among other memory
hogs.
Comments welcome.
cheers
andrew
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TIP 5: don't forget to increase your free space map settings
Index: src/bin/initdb/initdb.c
===================================================================
RCS file: /cvsroot/pgsql/src/bin/initdb/initdb.c,v
retrieving revision 1.101
diff -c -r1.101 initdb.c
*** src/bin/initdb/initdb.c 9 Dec 2005 15:51:14 -0000 1.101
--- src/bin/initdb/initdb.c 23 Dec 2005 20:29:15 -0000
***************
*** 120,125 ****
--- 120,126 ----
/* defaults */
static int n_connections = 10;
static int n_buffers = 50;
+ static int n_fsm_pages = 20000;
/*
* Warning messages for authentication methods
***************
*** 1090,1096 ****
test_connections(void)
{
char cmd[MAXPGPATH];
! static const int conns[] = {100, 50, 40, 30, 20, 10};
static const int len = sizeof(conns) / sizeof(int);
int i,
status;
--- 1091,1098 ----
test_connections(void)
{
char cmd[MAXPGPATH];
! static const int conns[] = {400, 300, 250, 200, 150,
! 100, 50, 40, 30, 20, 10};
static const int len = sizeof(conns) / sizeof(int);
int i,
status;
***************
*** 1125,1146 ****
test_buffers(void)
{
char cmd[MAXPGPATH];
! static const int bufs[] = {1000, 900, 800, 700, 600, 500,
! 400, 300, 200, 100, 50};
static const int len = sizeof(bufs) / sizeof(int);
int i,
! status;
! printf(_("selecting default shared_buffers ... "));
fflush(stdout);
for (i = 0; i < len; i++)
{
snprintf(cmd, sizeof(cmd),
"%s\"%s\" -boot -x0 %s "
"-c shared_buffers=%d -c max_connections=%d template1 "
"< \"%s\" > \"%s\" 2>&1%s",
SYSTEMQUOTE, backend_exec, boot_options,
bufs[i], n_connections,
DEVNULL, DEVNULL, SYSTEMQUOTE);
status = system(cmd);
--- 1127,1155 ----
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++)
{
+ test_max_fsm_pages = bufs[i] > 1000 ? 50 * bufs[i] : 20000;
snprintf(cmd, sizeof(cmd),
"%s\"%s\" -boot -x0 %s "
+ "-c max_fsm_pages=%d "
"-c shared_buffers=%d -c max_connections=%d template1 "
"< \"%s\" > \"%s\" 2>&1%s",
SYSTEMQUOTE, backend_exec, boot_options,
+ test_max_fsm_pages,
bufs[i], n_connections,
DEVNULL, DEVNULL, SYSTEMQUOTE);
status = system(cmd);
***************
*** 1150,1157 ****
if (i >= len)
i = len - 1;
n_buffers = bufs[i];
! printf("%d\n", n_buffers);
}
/*
--- 1159,1167 ----
if (i >= len)
i = len - 1;
n_buffers = bufs[i];
+ n_fsm_pages = test_max_fsm_pages;
! printf("%d/%d\n", n_buffers, n_fsm_pages);
}
/*
***************
*** 1177,1182 ****
--- 1187,1195 ----
snprintf(repltok, sizeof(repltok), "shared_buffers = %d", n_buffers);
conflines = replace_token(conflines, "#shared_buffers = 1000", repltok);
+ snprintf(repltok, sizeof(repltok), "max_fsm_pages = %d", n_fsm_pages);
+ conflines = replace_token(conflines, "#max_fsm_pages = 20000", repltok);
+
#if DEF_PGPORT != 5432
snprintf(repltok, sizeof(repltok), "#port = %d", DEF_PGPORT);
conflines = replace_token(conflines, "#port = 5432", repltok);
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