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tools/power turbostat: Increase the limit for fd opened

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[ Upstream commit 3ac1d14d05 ]

When running turbostat, a system with 512 cpus reaches the limit for
maximum number of file descriptors that can be opened. To solve this
problem, the limit is raised to 2^15, which is a large enough number.

Below data is collected from AMD server systems while running turbostat:

|-----------+-------------------------------|
| # of cpus | # of opened fds for turbostat |
|-----------+-------------------------------|
| 128       | 260                           |
|-----------+-------------------------------|
| 192       | 388                           |
|-----------+-------------------------------|
| 512       | 1028                          |
|-----------+-------------------------------|

So, the new max limit would be sufficient up to 2^14 cpus (but this
also depends on how many counters are enabled).

Reviewed-by: Doug Smythies <dsmythies@telus.net>
Tested-by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wyes Karny 2023-10-03 05:07:51 +00:00 committed by Greg Kroah-Hartman
parent 95973a9b64
commit 52b3541b35
1 changed files with 21 additions and 0 deletions
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21
tools/power/x86/turbostat/turbostat.c
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@ -53,6 +53,8 @@
#define NAME_BYTES 20
#define PATH_BYTES 128
#define MAX_NOFILE 0x8000
enum counter_scope { SCOPE_CPU, SCOPE_CORE, SCOPE_PACKAGE };
enum counter_type { COUNTER_ITEMS, COUNTER_CYCLES, COUNTER_SECONDS, COUNTER_USEC };
enum counter_format { FORMAT_RAW, FORMAT_DELTA, FORMAT_PERCENT };
@ -6719,6 +6721,22 @@ void cmdline(int argc, char **argv)
}
}
void set_rlimit(void)
{
struct rlimit limit;
if (getrlimit(RLIMIT_NOFILE, &limit) < 0)
err(1, "Failed to get rlimit");
if (limit.rlim_max < MAX_NOFILE)
limit.rlim_max = MAX_NOFILE;
if (limit.rlim_cur < MAX_NOFILE)
limit.rlim_cur = MAX_NOFILE;
if (setrlimit(RLIMIT_NOFILE, &limit) < 0)
err(1, "Failed to set rlimit");
}
int main(int argc, char **argv)
{
outf = stderr;
@ -6731,6 +6749,9 @@ int main(int argc, char **argv)
probe_sysfs();
if (!getuid())
set_rlimit();
turbostat_init();
msr_sum_record();