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tools/power turbostat: allow sub-sec intervals 

turbostat -i interval_sec

will sample and display statistics every interval_sec.
interval_sec used to be a whole number of seconds,
but now we accept a decimal, as small as 0.001 sec (1 ms).

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2016-02-12 22:44:48 -05:00
parent f0057310b4
commit 2a0609c02e
2 changed files with 17 additions and 5 deletions
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2
tools/power/x86/turbostat/turbostat.8
View File

@ -34,7 +34,7 @@ name as necessary to disambiguate it from others is necessary. Note that option
\fB--debug\fP displays additional system configuration information. Invoking this parameter
more than once may also enable internal turbostat debug information.
.PP
\fB--interval seconds\fP overrides the default 5-second measurement interval.
\fB--interval seconds\fP overrides the default 5.0 second measurement interval.
.PP
\fB--help\fP displays usage for the most common parameters.
.PP

20
tools/power/x86/turbostat/turbostat.c
View File

@ -38,12 +38,13 @@
#include <string.h>
#include <ctype.h>
#include <sched.h>
#include <time.h>
#include <cpuid.h>
#include <linux/capability.h>
#include <errno.h>
char *proc_stat = "/proc/stat";
unsigned int interval_sec = 5;
struct timespec interval_ts = {5, 0};
unsigned int debug;
unsigned int rapl_joules;
unsigned int summary_only;
@ -1728,7 +1729,7 @@ restart:
re_initialize();
goto restart;
}
sleep(interval_sec);
nanosleep(&interval_ts, NULL);
retval = for_all_cpus(get_counters, ODD_COUNTERS);
if (retval < -1) {
exit(retval);
@ -1742,7 +1743,7 @@ restart:
compute_average(EVEN_COUNTERS);
format_all_counters(EVEN_COUNTERS);
flush_stdout();
sleep(interval_sec);
nanosleep(&interval_ts, NULL);
retval = for_all_cpus(get_counters, EVEN_COUNTERS);
if (retval < -1) {
exit(retval);
@ -3347,7 +3348,18 @@ void cmdline(int argc, char **argv)
help();
exit(1);
case 'i':
interval_sec = atoi(optarg);
{
double interval = strtod(optarg, NULL);
if (interval < 0.001) {
fprintf(stderr, "interval %f seconds is too small\n",
interval);
exit(2);
}
interval_ts.tv_sec = interval;
interval_ts.tv_nsec = (interval - interval_ts.tv_sec) * 1000000000;
}
break;
case 'J':
rapl_joules++;