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Groups > linux.kernel > #1302214
| From | Jiri Olsa <jolsa@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 8/8] perf script: Add stat-cpi.py script |
| Date | 2016-01-05 22:20 +0100 |
| Message-ID | <qNHbl-8sH-41@gated-at.bofh.it> (permalink) |
| References | <qNHbk-8sH-11@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Adding stat-cpi.py as an example of how to do stat scripting.
It computes the CPI metrics from cycles and instructions
events.
Following stat record/report/script combinations could be used:
- get CPI for given workload
$ perf stat -e cycles,instructions record ls
SNIP
Performance counter stats for 'ls':
2,904,431 cycles
3,346,878 instructions # 1.15 insns per cycle
0.001782686 seconds time elapsed
$ perf script -s ./scripts/python/stat-cpi.py
0.001783: cpu -1, thread -1 -> cpi 0.867803 (2904431/3346878)
$ perf stat -e cycles,instructions record ls | perf script -s ./scripts/python/stat-cpi.py
SNIP
0.001730: cpu -1, thread -1 -> cpi 0.869026 (2928292/3369627)
- get CPI systemwide:
$ perf stat -e cycles,instructions -a -I 1000 record sleep 3
# time counts unit events
1.000158618 594,274,711 cycles (100.00%)
1.000158618 441,898,250 instructions
2.000350973 567,649,705 cycles (100.00%)
2.000350973 432,669,206 instructions
3.000559210 561,940,430 cycles (100.00%)
3.000559210 420,403,465 instructions
3.000670798 780,105 cycles (100.00%)
3.000670798 326,516 instructions
$ perf script -s ./scripts/python/stat-cpi.py
1.000159: cpu -1, thread -1 -> cpi 1.344823 (594274711/441898250)
2.000351: cpu -1, thread -1 -> cpi 1.311972 (567649705/432669206)
3.000559: cpu -1, thread -1 -> cpi 1.336669 (561940430/420403465)
3.000671: cpu -1, thread -1 -> cpi 2.389178 (780105/326516)
$ perf stat -e cycles,instructions -a -I 1000 record sleep 3 | perf script -s ./scripts/python/stat-cpi.py
1.000202: cpu -1, thread -1 -> cpi 1.035091 (940778881/908885530)
2.000392: cpu -1, thread -1 -> cpi 1.442600 (627493992/434974455)
3.000545: cpu -1, thread -1 -> cpi 1.353612 (741463930/547766890)
3.000622: cpu -1, thread -1 -> cpi 2.642110 (784083/296764)
Tested-by: Kan Liang <kan.liang@intel.com>
Link: http://lkml.kernel.org/n/tip-15vwwb4yea15wzz6bqbxdpc0@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/scripts/python/stat-cpi.py | 77 +++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
create mode 100644 tools/perf/scripts/python/stat-cpi.py
diff --git a/tools/perf/scripts/python/stat-cpi.py b/tools/perf/scripts/python/stat-cpi.py
new file mode 100644
index 000000000000..8b60f343dd07
--- /dev/null
+++ b/tools/perf/scripts/python/stat-cpi.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+
+data = {}
+times = []
+threads = []
+cpus = []
+
+def get_key(time, event, cpu, thread):
+ return "%d-%s-%d-%d" % (time, event, cpu, thread)
+
+def store_key(time, cpu, thread):
+ if (time not in times):
+ times.append(time)
+
+ if (cpu not in cpus):
+ cpus.append(cpu)
+
+ if (thread not in threads):
+ threads.append(thread)
+
+def store(time, event, cpu, thread, val, ena, run):
+ #print "event %s cpu %d, thread %d, time %d, val %d, ena %d, run %d" % \
+ # (event, cpu, thread, time, val, ena, run)
+
+ store_key(time, cpu, thread)
+ key = get_key(time, event, cpu, thread)
+ data[key] = [ val, ena, run]
+
+def get(time, event, cpu, thread):
+ key = get_key(time, event, cpu, thread)
+ return data[key][0]
+
+def stat__cycles_k(cpu, thread, time, val, ena, run):
+ store(time, "cycles", cpu, thread, val, ena, run);
+
+def stat__instructions_k(cpu, thread, time, val, ena, run):
+ store(time, "instructions", cpu, thread, val, ena, run);
+
+def stat__cycles_u(cpu, thread, time, val, ena, run):
+ store(time, "cycles", cpu, thread, val, ena, run);
+
+def stat__instructions_u(cpu, thread, time, val, ena, run):
+ store(time, "instructions", cpu, thread, val, ena, run);
+
+def stat__cycles(cpu, thread, time, val, ena, run):
+ store(time, "cycles", cpu, thread, val, ena, run);
+
+def stat__instructions(cpu, thread, time, val, ena, run):
+ store(time, "instructions", cpu, thread, val, ena, run);
+
+def stat__interval(time):
+ for cpu in cpus:
+ for thread in threads:
+ cyc = get(time, "cycles", cpu, thread)
+ ins = get(time, "instructions", cpu, thread)
+ cpi = 0
+
+ if ins != 0:
+ cpi = cyc/float(ins)
+
+ print "%15f: cpu %d, thread %d -> cpi %f (%d/%d)" % (time/(float(1000000000)), cpu, thread, cpi, cyc, ins)
+
+def trace_end():
+ pass
+# XXX trace_end callback could be used as an alternative place
+# to compute same values as in the script above:
+#
+# for time in times:
+# for cpu in cpus:
+# for thread in threads:
+# cyc = get(time, "cycles", cpu, thread)
+# ins = get(time, "instructions", cpu, thread)
+#
+# if ins != 0:
+# cpi = cyc/float(ins)
+#
+# print "time %.9f, cpu %d, thread %d -> cpi %f" % (time/(float(1000000000)), cpu, thread, cpi)
--
2.4.3
--
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[PATCHv8 0/8] perf stat: Add scripting support Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
[PATCH 5/8] perf script: Add stat default handlers Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
[tip:perf/core] perf script: Add stat default handlers tip-bot for Jiri Olsa <tipbot@zytor.com> - 2016-01-09 17:40 +0100
[PATCH 1/8] perf stat record: Keep sample_type 0 for pipe session Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
[tip:perf/core] perf stat record: Keep sample_type 0 for pipe session tip-bot for Jiri Olsa <tipbot@zytor.com> - 2016-01-09 17:30 +0100
[PATCH 8/8] perf script: Add stat-cpi.py script Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
Re: [PATCH 8/8] perf script: Add stat-cpi.py script Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-06 00:00 +0100
[PATCH 6/8] perf script: Display stat events by default Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
Re: [PATCH 6/8] perf script: Display stat events by default Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-05 23:50 +0100
Re: [PATCH 6/8] perf script: Display stat events by default Jiri Olsa <jolsa@redhat.com> - 2016-01-06 10:40 +0100
[PATCH 2/8] perf script: Process cpu/threads maps Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
[tip:perf/core] perf script: Process cpu/threads maps tip-bot for Jiri Olsa <tipbot@zytor.com> - 2016-01-09 17:30 +0100
[PATCH 4/8] perf script: Add process_stat/process_stat_interval scripting interface Jiri Olsa <jolsa@kernel.org> - 2016-01-05 22:20 +0100
[tip:perf/core] perf script: Add process_stat/ process_stat_interval scripting interface tip-bot for Jiri Olsa <tipbot@zytor.com> - 2016-01-09 17:40 +0100
Re: [PATCHv8 0/8] perf stat: Add scripting support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-01-05 23:40 +0100
Re: [PATCHv8 0/8] perf stat: Add scripting support Jiri Olsa <jolsa@redhat.com> - 2016-01-06 10:10 +0100
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