fdo-mirrors/cairo
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/cairo/cairo.git synced 2026-05-05 18:08:03 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

[perf] Add a fast-and-sloppy mode to cairo-perf.

Browse source 
A new -f option to cairo-perf reverts to a fast run
mode for quick performance overviews. The number of
milliseconds each iteration of a test is run for can
be overriden using the new CAIRO_PERF_ITERATION_MS
environment variable. The default remains 2000 ms/iter.
This commit is contained in:
M Joonas Pihlaja 2009-09-05 05:39:35 +03:00
parent 7f91c4953c
commit 270b2f1be0
2 changed files with 42 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
perf/cairo-perf.c
View file

@ -48,9 +48,11 @@
#include <sched.h>
#endif
#define CAIRO_PERF_ITERATIONS_DEFAULT 100
#define CAIRO_PERF_LOW_STD_DEV 0.03
#define CAIRO_PERF_STABLE_STD_DEV_COUNT 5
#define CAIRO_PERF_ITERATIONS_DEFAULT 100
#define CAIRO_PERF_LOW_STD_DEV 0.03
#define CAIRO_PERF_STABLE_STD_DEV_COUNT 5
#define CAIRO_PERF_ITERATION_MS_DEFAULT 2000
#define CAIRO_PERF_ITERATION_MS_FAST 5
typedef struct _cairo_perf_case {
CAIRO_PERF_DECL (*run);
@ -251,26 +253,31 @@ cairo_perf_run (cairo_perf_t *perf,
cairo_boilerplate_content (perf->target->content));
perf_func (perf->cr, perf->size, perf->size, 1);
calibration0 = perf_func (perf->cr, perf->size, perf->size, 1);
loops = cairo_perf_ticks_per_second () / 100 / calibration0;
if (loops < 3)
loops = 3;
calibration = (calibration0 + perf_func (perf->cr, perf->size, perf->size, loops)) / (loops + 1);
if (similar)
cairo_pattern_destroy (cairo_pop_group (perf->cr));
if (perf->fast_and_sloppy) {
calibration = calibration0;
} else {
loops = cairo_perf_ticks_per_second () / 100 / calibration0;
if (loops < 3)
loops = 3;
calibration = (calibration0 + perf_func (perf->cr, perf->size, perf->size, loops)) / (loops + 1);
if (similar)
cairo_pattern_destroy (cairo_pop_group (perf->cr));
}
/* XXX
* Compute the number of loops required for the timing interval to
* be ~2 seconds. This helps to eliminate sampling variance due to
* timing and other systematic errors. However, it also hides
* synchronisation overhead as we attempt to process a large batch
* of identical operations in a single shot. This can be considered
* both good and bad... It would be good to perform a more rigorous
* analysis of the synchronisation overhead, that is to estimate
* the time for loop=0.
* Compute the number of loops required for the timing
* interval to be perf->ms_per_iteration milliseconds. This
* helps to eliminate sampling variance due to timing and
* other systematic errors. However, it also hides
* synchronisation overhead as we attempt to process a large
* batch of identical operations in a single shot. This can be
* considered both good and bad... It would be good to perform
* a more rigorous analysis of the synchronisation overhead,
* that is to estimate the time for loop=0.
*/
loops = 2 * cairo_perf_ticks_per_second () / calibration;
loops = perf->ms_per_iteration * 0.001 * cairo_perf_ticks_per_second () / calibration;
if (loops < 10)
loops = 10;
loops = perf->fast_and_sloppy ? 1 : 10;
low_std_dev_count = 0;
for (i =0; i < perf->iterations; i++) {
@ -350,6 +357,7 @@ parse_options (cairo_perf_t *perf, int argc, char *argv[])
{
int c;
const char *iters;
const char *ms = NULL;
char *end;
int verbose = 0;
@ -359,6 +367,12 @@ parse_options (cairo_perf_t *perf, int argc, char *argv[])
perf->iterations = CAIRO_PERF_ITERATIONS_DEFAULT;
perf->exact_iterations = 0;
perf->fast_and_sloppy = FALSE;
perf->ms_per_iteration = CAIRO_PERF_ITERATION_MS_DEFAULT;
if ((ms = getenv("CAIRO_PERF_ITERATION_MS")) && *ms) {
perf->ms_per_iteration = atof(ms);
}
perf->raw = FALSE;
perf->list_only = FALSE;
perf->names = NULL;
@ -366,7 +380,7 @@ parse_options (cairo_perf_t *perf, int argc, char *argv[])
perf->summary = stdout;
while (1) {
c = _cairo_getopt (argc, argv, "i:lrv");
c = _cairo_getopt (argc, argv, "i:lrvf");
if (c == -1)
break;
@ -387,6 +401,11 @@ parse_options (cairo_perf_t *perf, int argc, char *argv[])
perf->raw = TRUE;
perf->summary = NULL;
break;
case 'f':
perf->fast_and_sloppy = TRUE;
if (ms == NULL)
perf->ms_per_iteration = CAIRO_PERF_ITERATION_MS_FAST;
break;
case 'v':
verbose = 1;
break;

3
perf/cairo-perf.h
View file

@ -83,6 +83,9 @@ typedef struct _cairo_perf {
unsigned int num_exclude_names;
cairo_bool_t exact_names;
double ms_per_iteration;
cairo_bool_t fast_and_sloppy;
/* Stuff used internally */
cairo_perf_ticks_t *times;
const cairo_boilerplate_target_t **targets;