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Commit 2a0609c0 authored by Len Brown's avatar Len Brown
Browse files

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: default avatarLen Brown <len.brown@intel.com>
parent f0057310

tools/power/x86/turbostat/turbostat.8

+1 −1
Original line number Diff line number Diff line
@@ -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

tools/power/x86/turbostat/turbostat.c

+16 −4
Original line number Diff line number Diff line
@@ -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 @@ void turbostat_loop() 
			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 @@ void turbostat_loop() 
		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++;