[PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Yu Chen]

From: Chen Yu <yu.c.chen@intel.com>

There's a use case during test to only print specific round of loops
if --interval is specified, for example, with this patch applied:

turbostat -i 5 --max_loops 4
will capture 4 samples with 5 seconds interval.

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
 tools/power/x86/turbostat/turbostat.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index bd9c6b31a504..a35418a59468 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -48,6 +48,7 @@ char *proc_stat = "/proc/stat";
 FILE *outf;
 int *fd_percpu;
 struct timespec interval_ts = {5, 0};
+unsigned int max_loops;
 unsigned int debug;
 unsigned int quiet;
 unsigned int sums_need_wide_columns;
@@ -470,6 +471,7 @@ void help(void)
 	"		{core | package | j,k,l..m,n-p }\n"
 	"--quiet	skip decoding system configuration header\n"
 	"--interval sec	Override default 5-second measurement interval\n"
+	"--max_loops times	The number of loops if interval is specified\n"
 	"--help		print this help message\n"
 	"--list		list column headers only\n"
 	"--out file	create or truncate \"file\" for all output\n"
@@ -2565,6 +2567,7 @@ void turbostat_loop()
 {
 	int retval;
 	int restarted = 0;
+	int loops = 0;
 
 restart:
 	restarted++;
@@ -2583,6 +2586,7 @@ void turbostat_loop()
 	restarted = 0;
 	gettimeofday(&tv_even, (struct timezone *)NULL);
 
+	loops = 0;
 	while (1) {
 		if (for_all_proc_cpus(cpu_is_not_present)) {
 			re_initialize();
@@ -2626,6 +2630,9 @@ void turbostat_loop()
 		compute_average(ODD_COUNTERS);
 		format_all_counters(ODD_COUNTERS);
 		flush_output_stdout();
+
+		if (++loops >= (max_loops/2))
+			break;
 	}
 }
 
@@ -5009,12 +5016,13 @@ void cmdline(int argc, char **argv)
 		{"Summary",	no_argument,		0, 'S'},
 		{"TCC",		required_argument,	0, 'T'},
 		{"version",	no_argument,		0, 'v' },
+		{"max_loops",	required_argument,	0, 'x'},
 		{0,		0,			0,  0 }
 	};
 
 	progname = argv[0];
 
-	while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:v",
+	while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:vx:",
 				long_options, &option_index)) != -1) {
 		switch (opt) {
 		case 'a':
@@ -5076,6 +5084,15 @@ void cmdline(int argc, char **argv)
 			print_version();
 			exit(0);
 			break;
+		case 'x':
+			{
+				unsigned int loops = strtod(optarg, NULL);
+
+				if (loops % 2)
+					loops++;
+				max_loops = loops;
+			}
+			break;
 		}
 	}
 }
-- 
2.13.6

Re: [PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Rafael J. Wysocki]

On Tue, Apr 10, 2018 at 12:18 PM, Yu Chen <yu.c.chen@intel.com> wrote:
> From: Chen Yu <yu.c.chen@intel.com>
>
> There's a use case during test to only print specific round of loops
> if --interval is specified, for example, with this patch applied:
>
> turbostat -i 5 --max_loops 4
> will capture 4 samples with 5 seconds interval.

Why --max_loops and not just --loops or --iterations?

> Signed-off-by: Chen Yu <yu.c.chen@intel.com>
> ---
>  tools/power/x86/turbostat/turbostat.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> index bd9c6b31a504..a35418a59468 100644
> --- a/tools/power/x86/turbostat/turbostat.c
> +++ b/tools/power/x86/turbostat/turbostat.c
> @@ -48,6 +48,7 @@ char *proc_stat = "/proc/stat";
>  FILE *outf;
>  int *fd_percpu;
>  struct timespec interval_ts = {5, 0};
> +unsigned int max_loops;
>  unsigned int debug;
>  unsigned int quiet;
>  unsigned int sums_need_wide_columns;
> @@ -470,6 +471,7 @@ void help(void)
>         "               {core | package | j,k,l..m,n-p }\n"
>         "--quiet        skip decoding system configuration header\n"
>         "--interval sec Override default 5-second measurement interval\n"
> +       "--max_loops times      The number of loops if interval is specified\n"
>         "--help         print this help message\n"
>         "--list         list column headers only\n"
>         "--out file     create or truncate \"file\" for all output\n"
> @@ -2565,6 +2567,7 @@ void turbostat_loop()
>  {
>         int retval;
>         int restarted = 0;
> +       int loops = 0;
>
>  restart:
>         restarted++;
> @@ -2583,6 +2586,7 @@ void turbostat_loop()
>         restarted = 0;
>         gettimeofday(&tv_even, (struct timezone *)NULL);
>
> +       loops = 0;
>         while (1) {
>                 if (for_all_proc_cpus(cpu_is_not_present)) {
>                         re_initialize();
> @@ -2626,6 +2630,9 @@ void turbostat_loop()
>                 compute_average(ODD_COUNTERS);
>                 format_all_counters(ODD_COUNTERS);
>                 flush_output_stdout();
> +
> +               if (++loops >= (max_loops/2))
> +                       break;
>         }
>  }
>
> @@ -5009,12 +5016,13 @@ void cmdline(int argc, char **argv)
>                 {"Summary",     no_argument,            0, 'S'},
>                 {"TCC",         required_argument,      0, 'T'},
>                 {"version",     no_argument,            0, 'v' },
> +               {"max_loops",   required_argument,      0, 'x'},
>                 {0,             0,                      0,  0 }
>         };
>
>         progname = argv[0];
>
> -       while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:v",
> +       while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:vx:",
>                                 long_options, &option_index)) != -1) {
>                 switch (opt) {
>                 case 'a':
> @@ -5076,6 +5084,15 @@ void cmdline(int argc, char **argv)
>                         print_version();
>                         exit(0);
>                         break;
> +               case 'x':
> +                       {
> +                               unsigned int loops = strtod(optarg, NULL);
> +
> +                               if (loops % 2)
> +                                       loops++;
> +                               max_loops = loops;
> +                       }
> +                       break;
>                 }
>         }
>  }
> --
> 2.13.6
>

Re: [PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Artem Bityutskiy]

On Tue, 2018-04-10 at 12:22 +0200, Rafael J. Wysocki wrote:
> On Tue, Apr 10, 2018 at 12:18 PM, Yu Chen <yu.c.chen@intel.com>
> wrote:
> > From: Chen Yu <yu.c.chen@intel.com>
> > 
> > There's a use case during test to only print specific round of
> > loops
> > if --interval is specified, for example, with this patch applied:
> > 
> > turbostat -i 5 --max_loops 4
> > will capture 4 samples with 5 seconds interval.
> 
> Why --max_loops and not just --loops or --iterations?

Or just --count.

Artem.

Re: [PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Bityutskiy, Artem]

On Tue, 2018-04-10 at 18:18 +0800, Yu Chen wrote:
> @@ -5076,6 +5084,15 @@ void cmdline(int argc, char **argv)
>                         print_version();
>                         exit(0);
>                         break;
> +               case 'x':
> +                       {
> +                               unsigned int loops = strtod(optarg, NULL);

It would make sense to error out here if you get a value <= 0.

> +
> +                               if (loops % 2)
> +                                       loops++;

What is this for?

> +                               max_loops = loops;

Is the "loops" variable really needed? Can you strtod directly to
max_loops?

-- 
Best Regards,
Artem Bityutskiy
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Re: [PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Yu Chen]

On Tue, Apr 10, 2018 at 12:22:16PM +0200, Rafael J. Wysocki wrote:
> On Tue, Apr 10, 2018 at 12:18 PM, Yu Chen <yu.c.chen@intel.com> wrote:
> > From: Chen Yu <yu.c.chen@intel.com>
> >
> > There's a use case during test to only print specific round of loops
> > if --interval is specified, for example, with this patch applied:
> >
> > turbostat -i 5 --max_loops 4
> > will capture 4 samples with 5 seconds interval.
> 
> Why --max_loops and not just --loops or --iterations?
>
I thought -l has been used already. OK, changed to --interation and
-t respectively.

Thanks!

Re: [PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

[Yu Chen]

Hi,
On Tue, Apr 10, 2018 at 07:02:22PM +0800, Bityutskiy, Artem wrote:
> On Tue, 2018-04-10 at 18:18 +0800, Yu Chen wrote:
> > @@ -5076,6 +5084,15 @@ void cmdline(int argc, char **argv)
> >                         print_version();
> >                         exit(0);
> >                         break;
> > +               case 'x':
> > +                       {
> > +                               unsigned int loops = strtod(optarg, NULL);
> 
> It would make sense to error out here if you get a value <= 0.
> 
OK.
> > +
> > +                               if (loops % 2)
> > +                                       loops++;
> 
> What is this for?
> 
It was intended to make the number of loops even for simplify.
But after rethink about this, it might not be necessary. I'll
change it.

> > +                               max_loops = loops;
> 
> Is the "loops" variable really needed? Can you strtod directly to
> max_loops?
If the sanity check for user input is added then I think the local
variable is needed.

Thanks,
Yu
> 
> -- 
> Best Regards,
> Artem Bityutskiy