mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-15 08:20:16 +08:00
Adjust pg_test_timing to show shortest test durations first, place
percentage column before count column. Docs updated.
This commit is contained in:
Bruce Momjian
parent
65b2ee27ad
commit
0f3351aacf
@ -14,16 +14,24 @@ static const char *progname;
|
||||
static int32 test_duration = 3;
|
||||
|
||||
static void handle_args(int argc, char *argv[]);
|
||||
static void test_timing(int32);
|
||||
static uint64 test_timing(int32);
|
||||
static void output(uint64 loop_count);
|
||||
|
||||
/* record duration in powers of 2 microseconds */
|
||||
int64 histogram[32];
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
uint64 loop_count;
|
||||
|
||||
progname = get_progname(argv[0]);
|
||||
|
||||
handle_args(argc, argv);
|
||||
|
||||
test_timing(test_duration);
|
||||
loop_count = test_timing(test_duration);
|
||||
|
||||
output(loop_count);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -95,25 +103,14 @@ handle_args(int argc, char *argv[])
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
static uint64
|
||||
test_timing(int32 duration)
|
||||
{
|
||||
uint64 total_time;
|
||||
int64 time_elapsed = 0;
|
||||
uint64 loop_count = 0;
|
||||
uint64 prev,
|
||||
cur;
|
||||
int32 diff,
|
||||
i,
|
||||
bits,
|
||||
found;
|
||||
|
||||
instr_time start_time,
|
||||
end_time,
|
||||
temp;
|
||||
|
||||
static int64 histogram[32];
|
||||
char buf[100];
|
||||
uint64 prev, cur;
|
||||
instr_time start_time, end_time, temp;
|
||||
|
||||
total_time = duration > 0 ? duration * 1000000 : 0;
|
||||
|
||||
@ -122,11 +119,14 @@ test_timing(int32 duration)
|
||||
|
||||
while (time_elapsed < total_time)
|
||||
{
|
||||
int32 diff, bits = 0;
|
||||
|
||||
prev = cur;
|
||||
INSTR_TIME_SET_CURRENT(temp);
|
||||
cur = INSTR_TIME_GET_MICROSEC(temp);
|
||||
diff = cur - prev;
|
||||
|
||||
/* Did time go backwards? */
|
||||
if (diff < 0)
|
||||
{
|
||||
printf("Detected clock going backwards in time.\n");
|
||||
@ -134,12 +134,14 @@ test_timing(int32 duration)
|
||||
exit(1);
|
||||
}
|
||||
|
||||
bits = 0;
|
||||
/* What is the highest bit in the time diff? */
|
||||
while (diff)
|
||||
{
|
||||
diff >>= 1;
|
||||
bits++;
|
||||
}
|
||||
|
||||
/* Update appropriate duration bucket */
|
||||
histogram[bits]++;
|
||||
|
||||
loop_count++;
|
||||
@ -153,19 +155,29 @@ test_timing(int32 duration)
|
||||
|
||||
printf("Per loop time including overhead: %0.2f nsec\n",
|
||||
INSTR_TIME_GET_DOUBLE(end_time) * 1e9 / loop_count);
|
||||
printf("Histogram of timing durations:\n");
|
||||
printf("%9s: %10s %9s\n", "< usec", "count", "percent");
|
||||
|
||||
found = 0;
|
||||
for (i = 31; i >= 0; i--)
|
||||
return loop_count;
|
||||
}
|
||||
|
||||
static void
|
||||
output(uint64 loop_count)
|
||||
{
|
||||
int64 max_bit = 31, i;
|
||||
|
||||
/* find highest bit value */
|
||||
while (max_bit > 0 && histogram[max_bit] == 0)
|
||||
max_bit--;
|
||||
|
||||
printf("Histogram of timing durations:\n");
|
||||
printf("%6s %10s %10s\n", "< usec", "% of total", "count");
|
||||
|
||||
for (i = 0; i <= max_bit; i++)
|
||||
{
|
||||
if (found || histogram[i])
|
||||
{
|
||||
found = 1;
|
||||
/* lame hack to work around INT64_FORMAT deficiencies */
|
||||
snprintf(buf, sizeof(buf), INT64_FORMAT, histogram[i]);
|
||||
printf("%9ld: %10s %8.5f%%\n", 1l << i, buf,
|
||||
(double) histogram[i] * 100 / loop_count);
|
||||
}
|
||||
char buf[100];
|
||||
|
||||
/* lame hack to work around INT64_FORMAT deficiencies */
|
||||
snprintf(buf, sizeof(buf), INT64_FORMAT, histogram[i]);
|
||||
printf("%6ld %9.5f %10s\n", 1l << i,
|
||||
(double) histogram[i] * 100 / loop_count, buf);
|
||||
}
|
||||
}
|
||||
|
||||
@ -98,12 +98,12 @@
|
||||
Testing timing overhead for 3 seconds.
|
||||
Per loop time including overhead: 35.96 nsec
|
||||
Histogram of timing durations:
|
||||
< usec: count percent
|
||||
16: 2 0.00000%
|
||||
8: 13 0.00002%
|
||||
4: 126 0.00015%
|
||||
2: 2999652 3.59518%
|
||||
1: 80435604 96.40465%
|
||||
< usec % of total count
|
||||
1 96.40465 80435604
|
||||
2 3.59518 2999652
|
||||
4 0.00015 126
|
||||
8 0.00002 13
|
||||
16 0.00000 2
|
||||
</screen>
|
||||
</para>
|
||||
|
||||
@ -159,12 +159,12 @@ tsc hpet acpi_pm
|
||||
# pg_test_timing
|
||||
Per loop time including overhead: 722.92 nsec
|
||||
Histogram of timing durations:
|
||||
< usec: count percent
|
||||
16: 3 0.00007%
|
||||
8: 563 0.01357%
|
||||
4: 3241 0.07810%
|
||||
2: 2990371 72.05956%
|
||||
1: 1155682 27.84870%
|
||||
< usec % of total count
|
||||
1 27.84870 1155682
|
||||
2 72.05956 2990371
|
||||
4 0.07810 3241
|
||||
8 0.01357 563
|
||||
16 0.00007 3
|
||||
</screen>
|
||||
</para>
|
||||
|
||||
@ -206,13 +206,13 @@ $ pg_test_timing
|
||||
Testing timing overhead for 3 seconds.
|
||||
Per timing duration including loop overhead: 97.75 ns
|
||||
Histogram of timing durations:
|
||||
< usec: count percent
|
||||
32: 1 0.00000%
|
||||
16: 1 0.00000%
|
||||
8: 22 0.00007%
|
||||
4: 3010 0.00981%
|
||||
2: 2993204 9.75277%
|
||||
1: 27694571 90.23734%
|
||||
< usec % of total count
|
||||
1 90.23734 27694571
|
||||
2 9.75277 2993204
|
||||
4 0.00981 3010
|
||||
8 0.00007 22
|
||||
16 0.00000 1
|
||||
32 0.00000 1
|
||||
</screen></para>
|
||||
|
||||
</refsect2>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user