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PG-246, PG-211, PG-147: Fix performance issue while querying the pg_stat_monitor.

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This performance fix resolves two more issues (PG-211, PG-147).
This commit is contained in:
Ibrar Ahmed
2021-10-05 20:33:34 +00:00
parent 8e39b02bce
commit a93ba37ac3
2 changed files with 46 additions and 29 deletions
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50
pg_stat_monitor.c
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@@ -25,9 +25,11 @@
PG_MODULE_MAGIC;
#define BUILD_VERSION "0.9.2-beta1"
#define PG_STAT_STATEMENTS_COLS 52 /* maximum of above */
#define PG_STAT_STATEMENTS_COLS 53 /* maximum of above */
#define PGSM_TEXT_FILE "/tmp/pg_stat_monitor_query"
#define roundf(x,d) ((floor(((x)*pow(10,d))+.5))/pow(10,d))
#define PGUNSIXBIT(val) (((val) & 0x3F) + '0')
#define _snprintf(_str_dst, _str_src, _len, _max_len)\
@@ -1648,7 +1650,8 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
char parentid_txt[32];
pgssSharedState *pgss = pgsm_get_ss();
HTAB *pgss_hash = pgsm_get_hash();
char *query_txt = (char*) malloc(PGSM_QUERY_MAX_LEN);
char *query_txt = (char*) palloc0(PGSM_QUERY_MAX_LEN);
char *parent_query_txt = (char*) palloc0(PGSM_QUERY_MAX_LEN);
/* Safety check... */
if (!IsSystemInitialized())
@@ -1675,7 +1678,7 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "pg_stat_monitor: return type must be a row type");
if (tupdesc->natts != 49)
if (tupdesc->natts != 50)
elog(ERROR, "pg_stat_monitor: incorrect number of output arguments, required %d", tupdesc->natts);
tupstore = tuplestore_begin_heap(true, false, work_mem);
@@ -1714,6 +1717,7 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
if (query_entry == NULL)
continue;
if (read_query(buf, bucketid, queryid, query_txt) == 0)
{
int len;
@@ -1734,6 +1738,16 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
if (tmp.state == PGSS_FINISHED)
continue;
}
if (tmp.info.parentid != UINT64CONST(0))
{
int len = 0;
if (read_query(buf, bucketid, tmp.info.parentid, parent_query_txt) == 0)
{
len = read_query_buffer(bucketid, tmp.info.parentid, parent_query_txt);
if (len != MAX_QUERY_BUFFER_BUCKET)
snprintf(parent_query_txt, 32, "%s", "<insufficient disk/shared space>");
}
}
/* bucketid at column number 0 */
values[i++] = Int64GetDatumFast(bucketid);
@@ -1808,10 +1822,12 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
{
snprintf(parentid_txt, 32, "%08lX",tmp.info.parentid);
values[i++] = CStringGetTextDatum(parentid_txt);
values[i++] = CStringGetTextDatum(parent_query_txt);
}
else
{
nulls[i++] = true;
nulls[i++] = true;
}
/* application_name at column number 9 */
@@ -1880,23 +1896,23 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
values[i++] = Int64GetDatumFast(tmp.calls.calls);
/* total_time at column number 17 */
values[i++] = Float8GetDatumFast(tmp.time.total_time);
values[i++] = Float8GetDatumFast(roundf(tmp.time.total_time, 4));
/* min_time at column number 18 */
values[i++] = Float8GetDatumFast(tmp.time.min_time);
values[i++] = Float8GetDatumFast(roundf(tmp.time.min_time,4));
/* max_time at column number 19 */
values[i++] = Float8GetDatumFast(tmp.time.max_time);
values[i++] = Float8GetDatumFast(roundf(tmp.time.max_time,4));
/* mean_time at column number 20 */
values[i++] = Float8GetDatumFast(tmp.time.mean_time);
values[i++] = Float8GetDatumFast(roundf(tmp.time.mean_time,4));
if (tmp.calls.calls > 1)
stddev = sqrt(tmp.time.sum_var_time / tmp.calls.calls);
else
stddev = 0.0;
/* calls at column number 21 */
values[i++] = Float8GetDatumFast(stddev);
values[i++] = Float8GetDatumFast(roundf(stddev,4));
/* calls at column number 22 */
values[i++] = Int64GetDatumFast(tmp.calls.rows);
@@ -1912,23 +1928,23 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
values[i++] = Int64GetDatumFast(tmp.plancalls.calls);
/* total_time at column number 24 */
values[i++] = Float8GetDatumFast(tmp.plantime.total_time);
values[i++] = Float8GetDatumFast(roundf(tmp.plantime.total_time,4));
/* min_time at column number 25 */
values[i++] = Float8GetDatumFast(tmp.plantime.min_time);
values[i++] = Float8GetDatumFast(roundf(tmp.plantime.min_time,4));
/* max_time at column number 26 */
values[i++] = Float8GetDatumFast(tmp.plantime.max_time);
values[i++] = Float8GetDatumFast(roundf(tmp.plantime.max_time,4));
/* mean_time at column number 27 */
values[i++] = Float8GetDatumFast(tmp.plantime.mean_time);
values[i++] = Float8GetDatumFast(roundf(tmp.plantime.mean_time,4));
if (tmp.plancalls.calls > 1)
stddev = sqrt(tmp.plantime.sum_var_time / tmp.plancalls.calls);
else
stddev = 0.0;
/* calls at column number 28 */
values[i++] = Float8GetDatumFast(stddev);
values[i++] = Float8GetDatumFast(roundf(stddev,4));
/* blocks are from column number 29 - 40 */
values[i++] = Int64GetDatumFast(tmp.blocks.shared_blks_hit);
@@ -1948,10 +1964,10 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
values[i++] = IntArrayGetTextDatum(tmp.resp_calls, MAX_RESPONSE_BUCKET);
/* utime at column number 42 */
values[i++] = Float8GetDatumFast(tmp.sysinfo.utime);
values[i++] = Float8GetDatumFast(roundf(tmp.sysinfo.utime,4));
/* stime at column number 43 */
values[i++] = Float8GetDatumFast(tmp.sysinfo.stime);
values[i++] = Float8GetDatumFast(roundf(tmp.sysinfo.stime,4));
{
char buf[256];
Datum wal_bytes;
@@ -1980,7 +1996,8 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
}
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
}
free(query_txt);
pfree(query_txt);
pfree(parent_query_txt);
/* clean up and return the tuplestore */
LWLockRelease(pgss->lock);
@@ -3018,7 +3035,6 @@ read_query(unsigned char *buf, uint64 bucketid, uint64 queryid, char * query)
memcpy(&query_id, &buf[rlen], sizeof (uint64)); /* query id */
if (query_id == queryid)
found = true;
rlen += sizeof (uint64);
if (buf_len <= rlen)
continue;