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PG-173: Added new WAL usage statistics.

pull/72/head
Ibrar Ahmed 2021-02-02 15:50:33 +00:00
parent 12ba1e39d1
commit 8410572ce3
3 changed files with 46 additions and 6 deletions
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10
pg_stat_monitor--1.0.sql
View File

@ -70,7 +70,10 @@ CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
OUT blk_write_time float8,
OUT resp_calls text,
OUT cpu_user_time float8,
OUT cpu_sys_time float8
OUT cpu_sys_time float8,
OUT wal_records int8,
OUT wal_fpi int8,
OUT wal_bytes numeric
)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'pg_stat_monitor'
@ -145,7 +148,10 @@ CREATE VIEW pg_stat_monitor AS SELECT
blk_write_time,
(string_to_array(resp_calls, ',')) resp_calls,
round(cpu_user_time::numeric, 4) as cpu_user_time,
round(cpu_sys_time::numeric, 4) as cpu_sys_time
round(cpu_sys_time::numeric, 4) as cpu_sys_time,
wal_records,
wal_fpi,
wal_bytes
FROM pg_stat_monitor(TRUE), pg_database WHERE dbid = oid
ORDER BY bucket_start_time;

33
pg_stat_monitor.c
View File

@ -21,7 +21,7 @@
PG_MODULE_MAGIC;
#define BUILD_VERSION "0.7.0"
#define PG_STAT_STATEMENTS_COLS 42 /* maximum of above */
#define PG_STAT_STATEMENTS_COLS 45 /* maximum of above */
#define PGSM_TEXT_FILE "/tmp/pg_stat_monitor_query"
#define PGUNSIXBIT(val) (((val) & 0x3F) + '0')
@ -1000,6 +1000,11 @@ static void pgss_store(uint64 queryId,
e->counters.sysinfo.stime = stime;
if (sqlcode[0] != 0)
memset(&entry->counters.blocks, 0, sizeof(entry->counters.blocks));
#if PG_VERSION_NUM >= 130000
e->counters.walusage.wal_records += walusage->wal_records;
e->counters.walusage.wal_fpi += walusage->wal_fpi;
e->counters.walusage.wal_bytes += walusage->wal_bytes;
#endif
SpinLockRelease(&e->mutex);
}
}
@ -1251,6 +1256,28 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
values[i++] = IntArrayGetTextDatum(tmp.resp_calls, MAX_RESPONSE_BUCKET);
values[i++] = Float8GetDatumFast(tmp.sysinfo.utime);
values[i++] = Float8GetDatumFast(tmp.sysinfo.stime);
#if PG_VERSION_NUM >= 130000
{
char buf[256];
Datum wal_bytes;
values[i++] = Int64GetDatumFast(tmp.walusage.wal_records);
values[i++] = Int64GetDatumFast(tmp.walusage.wal_fpi);
snprintf(buf, sizeof buf, UINT64_FORMAT, tmp.walusage.wal_bytes);
/* Convert to numeric. */
wal_bytes = DirectFunctionCall3(numeric_in,
CStringGetDatum(buf),
ObjectIdGetDatum(0),
Int32GetDatum(-1));
values[i++] = wal_bytes;
}
#else
nulls[i++] = true;
nulls[i++] = true;
nulls[i++] = true;
#endif
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
}
free(query_txt);
@ -2587,7 +2614,7 @@ int
read_query_buffer(int bucket_id, uint64 queryid, char *query_txt)
{
int fd = 0;
int buf_len;
int buf_len = 0;
char file_name[1024];
unsigned char *buf = NULL;
int off = 0;
@ -2711,7 +2738,7 @@ get_histogram_timings(PG_FUNCTION_ARGS)
{
int64 b_start = (index == 1)? 0 : exp(bucket_size * (index - 1));
int64 b_end = exp(bucket_size * index);
sprintf(range[index-1], "(%d - %d)}", b_start, b_end);
sprintf(range[index-1], "(%ld - %ld)}", b_start, b_end);
}
return TextArrayGetTextDatum(range, b_count, 1024);
}

7
pg_stat_monitor.h
View File

@ -209,6 +209,12 @@ typedef struct SysInfo
float stime; /* system cpu time */
} SysInfo;
typedef struct Wal_Usage
{
int64 wal_records; /* # of WAL records generated */
int64 wal_fpi; /* # of WAL full page images generated */
uint64 wal_bytes; /* total amount of WAL bytes generated */
} Wal_Usage;
/*
* The actual stats counters kept within pgssEntry.
*/
@ -221,6 +227,7 @@ typedef struct Counters
Blocks blocks;
SysInfo sysinfo;
ErrorInfo error;
Wal_Usage walusage;
int plans;
int resp_calls[MAX_RESPONSE_BUCKET]; /* execution time's in msec */
} Counters;