Mark Pether ([EMAIL PROTECTED]) reports a bug with a severity of 2
The lower the number the more severe it is.
Short Description
Too many inserts crash server
Long Description
If I create an external C function consisting of a
simple loop that inserts 250000 records into a table
the server process eventually crashes.
Actually the number of inserts appears to be dependant
upon memory consumption by SPI manager. (so your milage
may vary)
The workaround I found involves periodically calling
SPI_finish + SPI_connect to bounce the manager.
I have included code to illustrate the problem and my workaround.
My platform is:
Intel P3
Mandrake 8.2
512mb RAM
Postgres 7.3
plenty of disk free.
Sample Code
postgres initialisation:
create table triple (a int, b int, c int);
create or replace function crashme() returns void as 'pgtest.so' language 'c';
create or replace function dontcrashme() returns void as 'pgtest.so' language 'c';
the code:
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include "avl.h"
#include "postgres.h"
#include "fmgr.h"
#include "executor/spi.h"
#include "utils/date.h"
#include "utils/datetime.h"
Datum crashme(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(crashme);
Datum crashme(PG_FUNCTION_ARGS)
{
const char *DEBUG_NAME = "crashme(): ";
char *query = "insert into triple values (100, 200, 300)";
if (SPI_connect() == SPI_OK_CONNECT)
{
int i;
int exec_result;
for (i=0; i<250000; i++)
{
if (!(i%16384))
{
elog(INFO, "%sstill alive", DEBUG_NAME);
}
if ((exec_result = SPI_exec(query, 0)) != SPI_OK_INSERT)
{
elog(ERROR, "%sinsert failed (%d)", DEBUG_NAME,
exec_result);
break;
}
}
SPI_finish();
}
else
{
elog(ERROR, "%scould not connect", DEBUG_NAME);
}
PG_RETURN_NULL();
}
Datum dontcrashme(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(dontcrashme);
Datum dontcrashme(PG_FUNCTION_ARGS)
{
const char *DEBUG_NAME = "dontcrashme(): ";
char *query = "insert into triple values (100, 200, 300)";
if (SPI_connect() == SPI_OK_CONNECT)
{
int i;
int exec_result;
for (i=0; i<250000; i++)
{
if (!(i%16384))
{
elog(INFO, "%sbouncing SPI manager", DEBUG_NAME);
elog(INFO, "%sSPI_finish (%s)",
DEBUG_NAME, (SPI_finish() ==
SPI_OK_FINISH) ? "good" : "bad");
elog(INFO, "%sSPI_connect (%s)",
DEBUG_NAME, (SPI_connect() ==
SPI_OK_CONNECT) ? "good" : "bad");
}
if ((exec_result = SPI_exec(query, 0)) != SPI_OK_INSERT)
{
elog(ERROR, "%sinsert failed (%d)", DEBUG_NAME,
exec_result);
break;
}
}
SPI_finish();
}
else
{
elog(ERROR, "%scould not connect", DEBUG_NAME);
}
PG_RETURN_NULL();
}
No file was uploaded with this report
---------------------------(end of broadcast)---------------------------
TIP 2: you can get off all lists at once with the unregister command
(send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
