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test: latency - add -y option (I/O usleep)

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2022-11-23 17:56:20 +01:00
parent 9649b64c6f
commit f0f054517c
1 changed files with 12 additions and 1 deletions
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13
test/latency.c
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@ -52,6 +52,7 @@ int latency_max = 2048; /* in frames / 2 */
int loop_sec = 30; /* seconds */ int loop_sec = 30; /* seconds */
int block = 0; /* block mode */ int block = 0; /* block mode */
int use_poll = 0; int use_poll = 0;
int usleep_val = 0;
int resample = 1; int resample = 1;
int sys_latency = 0; /* data I/O: use system timings instead driver wakeups */ int sys_latency = 0; /* data I/O: use system timings instead driver wakeups */
int pos_dump = 0; /* dump positions */ int pos_dump = 0; /* dump positions */
@ -509,6 +510,8 @@ void help(void)
"-s,--seconds duration of test in seconds\n" "-s,--seconds duration of test in seconds\n"
"-b,--block block mode\n" "-b,--block block mode\n"
"-p,--poll use poll (wait for event - reduces CPU usage)\n" "-p,--poll use poll (wait for event - reduces CPU usage)\n"
"-y,--usleep sleep for the specified amount of microseconds between\n"
" stream updates (default 0 - off)\n"
"-e,--effect apply an effect (bandpass filter sweep)\n" "-e,--effect apply an effect (bandpass filter sweep)\n"
"-x,--posdump dump buffer positions\n" "-x,--posdump dump buffer positions\n"
"-X,--realtime do a realtime check (buffering)\n" "-X,--realtime do a realtime check (buffering)\n"
@ -548,6 +551,7 @@ int main(int argc, char *argv[])
{"seconds", 1, NULL, 's'}, {"seconds", 1, NULL, 's'},
{"block", 0, NULL, 'b'}, {"block", 0, NULL, 'b'},
{"poll", 0, NULL, 'p'}, {"poll", 0, NULL, 'p'},
{"usleep", 1, NULL, 'y'},
{"effect", 0, NULL, 'e'}, {"effect", 0, NULL, 'e'},
{"posdump", 0, NULL, 'x'}, {"posdump", 0, NULL, 'x'},
{"realtime", 0, NULL, 'X'}, {"realtime", 0, NULL, 'X'},
@ -565,7 +569,7 @@ int main(int argc, char *argv[])
morehelp = 0; morehelp = 0;
while (1) { while (1) {
int c; int c;
if ((c = getopt_long(argc, argv, "hP:C:m:M:U:F:f:c:r:B:E:s:bpenxX", long_option, NULL)) < 0) if ((c = getopt_long(argc, argv, "hP:C:m:M:U:F:f:c:r:B:E:s:y:bpenxX", long_option, NULL)) < 0)
break; break;
switch (c) { switch (c) {
case 'h': case 'h':
@ -624,6 +628,9 @@ int main(int argc, char *argv[])
case 'p': case 'p':
use_poll = 1; use_poll = 1;
break; break;
case 'y':
usleep_val = atoi(optarg);
break;
case 'e': case 'e':
effect = 1; effect = 1;
break; break;
@ -671,6 +678,8 @@ int main(int argc, char *argv[])
loop_limit, latency_min * 2, latency_max * 2); loop_limit, latency_min * 2, latency_max * 2);
if (sys_latency > 0) if (sys_latency > 0)
printf(", I/O updates %ims", sys_latency); printf(", I/O updates %ims", sys_latency);
else if (!block)
printf(", I/O usleep %ius", usleep_val);
printf("\n"); printf("\n");
if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK, block ? 0 : SND_PCM_NONBLOCK)) < 0) { if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK, block ? 0 : SND_PCM_NONBLOCK)) < 0) {
@ -755,6 +764,8 @@ int main(int argc, char *argv[])
} else if (use_poll) { } else if (use_poll) {
/* use poll to wait for next event */ /* use poll to wait for next event */
snd_pcm_wait(chandle, 1000); snd_pcm_wait(chandle, 1000);
} else if (usleep_val > 0) {
usleep(usleep_val);
} }
if (pos_dump || realtime_check) { if (pos_dump || realtime_check) {
if (sys_latency <= 0) if (sys_latency <= 0)