11 Mar, 2010
1 commit
-
At present, the perf subcommands that do system-wide monitoring
(perf stat, perf record and perf top) don't work properly unless
the online cpus are numbered 0, 1, ..., N-1. These tools ask
for the number of online cpus with sysconf(_SC_NPROCESSORS_ONLN)
and then try to create events for cpus 0, 1, ..., N-1.This creates problems for systems where the online cpus are
numbered sparsely. For example, a POWER6 system in
single-threaded mode (i.e. only running 1 hardware thread per
core) will have only even-numbered cpus online.This fixes the problem by reading the /sys/devices/system/cpu/online
file to find out which cpus are online. The code that does that is in
tools/perf/util/cpumap.[ch], and consists of a read_cpu_map()
function that sets up a cpumap[] array and returns the number of
online cpus. If /sys/devices/system/cpu/online can't be read or
can't be parsed successfully, it falls back to using sysconf to
ask how many cpus are online and sets up an identity map in cpumap[].The perf record, perf stat and perf top code then calls
read_cpu_map() in the system-wide monitoring case (instead of
sysconf) and uses cpumap[] to get the cpu numbers to pass to
perf_event_open.Signed-off-by: Paul Mackerras
Cc: Anton Blanchard
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
13 Jan, 2010
1 commit
-
current pid option doesn't work for perf stat. Change it to what
perf record --pid acts as.Signed-off-by: Liming Wang
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
15 Nov, 2009
1 commit
-
The ratio between the number of events and the time elapsed makes
sense only if task-clock event is counted. Otherwise it will be
simply a (confusing)# 0.000 M/sec
This patch outputs the ratio only if task-clock event is counted.
Some test examples of before and after:Before:
[lucas@skywalker linux.trees.git]$ sudo perf stat -e branch-misses -a -- sleep 1
Performance counter stats for 'sleep 1':
1367818 branch-misses # 0.000 M/sec
1.001494325 seconds time elapsed
After (without task-clock):
[lucas@skywalker perf]$ sudo ./perf stat -e branch-misses -a -- sleep 1
Performance counter stats for 'sleep 1':
1135044 branch-misses
1.001370775 seconds time elapsed
After (with task-clock):
[lucas@skywalker perf]$ sudo ./perf stat -e branch-misses -e task-clock -a -- sleep 1
Performance counter stats for 'sleep 1':
1070111 branch-misses # 0.534 M/sec
2002.730893 task-clock-msecs # 1.999 CPUs1.001640292 seconds time elapsed
Signed-off-by: Lucas De Marchi
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
19 Oct, 2009
4 commits
-
Count branches first, cache-misses second. The reason is that
on x86 branches are not counted by all counters on all CPUs.Before:
Performance counter stats for 'ls':
0.756653 task-clock-msecs # 0.802 CPUs
0 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
250 page-faults # 0.330 M/sec
2375725 cycles # 3139.781 M/sec
1628129 instructions # 0.685 IPC
19643 cache-references # 25.960 M/sec
4608 cache-misses # 6.090 M/sec
342532 branches # 452.694 M/sec
branch-misses0.000943356 seconds time elapsed
After:
Performance counter stats for 'ls':
1.056734 task-clock-msecs # 0.859 CPUs
0 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
259 page-faults # 0.245 M/sec
3345932 cycles # 3166.295 M/sec
3074090 instructions # 0.919 IPC
616928 branches # 583.806 M/sec
39279 branch-misses # 6.367 %
21312 cache-references # 20.168 M/sec
3661 cache-misses # 3.464 M/sec0.001230551 seconds time elapsed
(also prettify the printout of branch misses, in case it's
getting scaled.)Cc: Tim Blechmann
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
---
tools/perf/builtin-stat.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c373683..95a55ea 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -59,6 +59,8 @@ static struct perf_event_attr default_attrs[] = {
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },};
---
tools/perf/builtin-stat.c | 20 ++++++++++----------
1 files changed, 10 insertions(+), 10 deletions(-)diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 95a55ea..90e0a26 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -50,17 +50,17 @@static struct perf_event_attr default_attrs[] = {
- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
-
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
+
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },};
-
Clean up the array definition to be vertically aligned.
No functional effects.
Cc: Tim Blechmann
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
---
tools/perf/builtin-stat.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c373683..95a55ea 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -59,6 +59,8 @@ static struct perf_event_attr default_attrs[] = {
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
{ .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },};
-
Adds performance event information about branches
and branch misses to the default output of perf stat.Signed-off-by: Tim Blechmann
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
When we count both branches and branch-misses it is useful to
print out the percentage of branch-misses:# perf stat -e branches -e branch-misses /bin/true
Performance counter stats for '/bin/true':
401684 branches # 0.000 M/sec
23301 branch-misses # 5.801 %Signed-off-by: Anton Blanchard
Cc: paulus@samba.org
Cc: a.p.zijlstra@chello.nl
LKML-Reference:
Signed-off-by: Ingo Molnar
05 Oct, 2009
1 commit
-
If we launch the child on behalf of the user, ensure that it dies
along with ourselves when we are interrupted.Signed-off-by: Chris Wilson
Cc: Chris Wilson
LKML-Reference:
Signed-off-by: Ingo Molnar
22 Sep, 2009
1 commit
-
Before:
0 sched:sched_switch # nan M/sec
After:
0 sched:sched_switch # 0.000 M/sec
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar
21 Sep, 2009
1 commit
-
Bye-bye Performance Counters, welcome Performance Events!
In the past few months the perfcounters subsystem has grown out its
initial role of counting hardware events, and has become (and is
becoming) a much broader generic event enumeration, reporting, logging,
monitoring, analysis facility.Naming its core object 'perf_counter' and naming the subsystem
'perfcounters' has become more and more of a misnomer. With pending
code like hw-breakpoints support the 'counter' name is less and
less appropriate.All in one, we've decided to rename the subsystem to 'performance
events' and to propagate this rename through all fields, variables
and API names. (in an ABI compatible fashion)The word 'event' is also a bit shorter than 'counter' - which makes
it slightly more convenient to write/handle as well.Thanks goes to Stephane Eranian who first observed this misnomer and
suggested a rename.User-space tooling and ABI compatibility is not affected - this patch
should be function-invariant. (Also, defconfigs were not touched to
keep the size down.)This patch has been generated via the following script:
FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
sed -i \
-e 's/PERF_EVENT_/PERF_RECORD_/g' \
-e 's/PERF_COUNTER/PERF_EVENT/g' \
-e 's/perf_counter/perf_event/g' \
-e 's/nb_counters/nb_events/g' \
-e 's/swcounter/swevent/g' \
-e 's/tpcounter_event/tp_event/g' \
$FILESfor N in $(find . -name perf_counter.[ch]); do
M=$(echo $N | sed 's/perf_counter/perf_event/g')
mv $N $M
doneFILES=$(find . -name perf_event.*)
sed -i \
-e 's/COUNTER_MASK/REG_MASK/g' \
-e 's/COUNTER/EVENT/g' \
-e 's/\/event_id/g' \
-e 's/counter/event/g' \
-e 's/Counter/Event/g' \
$FILES... to keep it as correct as possible. This script can also be
used by anyone who has pending perfcounters patches - it converts
a Linux kernel tree over to the new naming. We tried to time this
change to the point in time where the amount of pending patches
is the smallest: the end of the merge window.Namespace clashes were fixed up in a preparatory patch - and some
stylistic fallout will be fixed up in a subsequent patch.( NOTE: 'counters' are still the proper terminology when we deal
with hardware registers - and these sed scripts are a bit
over-eager in renaming them. I've undone some of that, but
in case there's something left where 'counter' would be
better than 'event' we can undo that on an individual basis
instead of touching an otherwise nicely automated patch. )Suggested-by: Stephane Eranian
Acked-by: Peter Zijlstra
Acked-by: Paul Mackerras
Reviewed-by: Arjan van de Ven
Cc: Mike Galbraith
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
Cc: Steven Rostedt
Cc: Benjamin Herrenschmidt
Cc: David Howells
Cc: Kyle McMartin
Cc: Martin Schwidefsky
Cc: "David S. Miller"
Cc: Thomas Gleixner
Cc: "H. Peter Anvin"
Cc:
LKML-Reference:
Signed-off-by: Ingo Molnar
05 Sep, 2009
1 commit
-
Remove some, now useless, global storage.
Don't calculate the stddev when not needed.Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
04 Sep, 2009
4 commits
-
Use the more advanced single pass variance algorithm outlined
on the wikipedia page. This is numerically more stable for
larger sample sets.Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
When we're computing the mean by sampling the distribution,
then the std dev of the mean is related to the std dev of the
sample set by:stddev_mean = std_dev / sqrt(N)
Which is exactly what we want.
This results in the error on the mean decreasing with
increasing number of samples.Also fix the scaled == -1, aka not counted case.
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Since we don't need all the individual samples to calculate the
error remove both the limit and the storage overhead associated
with that.Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
The current noise computation does:
\Sum abs(n_i - avg(n)) * N^-1.5
Which is (afaik) not a regular noise function, and needs the
complete sample set available to post-process.Change this to use a regular stddev computation which can be
done by keeping a two sums:stddev = sqrt( 1/N (\Sum n_i^2) - avg(n)^2 )
For which we only need to keep \Sum n_i and \Sum n_i^2.
Signed-off-by: Peter Zijlstra
Cc:
LKML-Reference:
Signed-off-by: Ingo Molnar
17 Aug, 2009
1 commit
-
Librarize trace_event() helper so that perf trace can use it
too. Also clean up the debug.h includes a bit.It's not good to have it included in perf.h because it doesn't
make it flexible against other headers it may need (headers
that can also depend on perf.h and then create a recursive
header dependency).Signed-off-by: Frederic Weisbecker
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar
12 Aug, 2009
1 commit
-
Factorize multiple definitions of high level dso helpers into the
symbol source file.The side effect is a general export of the verbose and eprintf
debugging helpers into a new file dedicated to debugging purposes.Signed-off-by: Frederic Weisbecker
Cc: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Brice Goglin
09 Aug, 2009
1 commit
-
We want to use a coherent flag for -S/--stat across all tools,
so free up -S in perf stat.Signed-off-by: Brice Goglin
Cc: Peter Zijlstra
Cc: paulus@samba.org
Signed-off-by: Ingo Molnar
23 Jul, 2009
1 commit
-
perf stat and perf record currently look for all options on the command
line. This can lead to some confusion:# perf stat ls -l
Error: unknown switch `l'While we can work around this by adding '--' before the command, the git
option parsing code can stop at the first non option:# perf stat ls -l
Performance counter stats for 'ls -l':
....Signed-off-by: Anton Blanchard
Signed-off-by: Peter Zijlstra
LKML-Reference:
02 Jul, 2009
1 commit
-
Building builtin-stat.c reports the following errors:
cc1: warnings being treated as errors
builtin-stat.c: In function ‘run_perf_stat’:
builtin-stat.c:242: erreur: ignoring return value of ‘read’, declared with attribute warn_unused_result
builtin-stat.c:255: erreur: ignoring return value of ‘read’, declared with attribute warn_unused_result
make: *** [builtin-stat.o] Erreur 1This patch handles the possible pipe read failures.
Signed-off-by: Frederic Weisbecker
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Anton Blanchard
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
01 Jul, 2009
2 commits
-
MATCH_EVENT is useful:
1. for multiple attrs checking
2. avoid repetition of PERF_TYPE_ and PERF_COUNT_ and save space
3. avoids line breakageSigned-off-by: Jaswinder Singh Rajput
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Enable -Wextra. This found a few real bugs plus a number
of signed/unsigned type mismatches/uncleanlinesses. It
also required a few annotationsAll things considered it was still worth it so lets try with
this enabled for now.Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar
30 Jun, 2009
3 commits
-
This provides a way to mark a counter to be enabled on the next
exec. This is useful for measuring the total activity of a
program without including overhead from the process that
launches it.This also changes the perf stat command to use this new
facility.Signed-off-by: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Vince Weaver reported a 'perf stat' measurement overhead in the
count of retired instructions, which can amount to a +6000
instructions inflated count in the reported count.At present, perf stat creates its counters on the perf process. Thus
the counters count the fork and various other activity in both the
parent and child, such as the resolver overhead for resolving PLT
entries for any libc functions that haven't been called before, such
as execvp.This reduces the overhead by creating the counters on the child process
after the fork, using a couple of pipes to synchronize so that the
child process waits until the parent has created the counters before
doing the exec. To eliminate the PLT resolution overhead on calling
execvp, this does a dummy execvp first which will always fail.With this, the overhead of executing a program goes down from over
4800 instructions to about 90 instructions on powerpc (32-bit).
This was measured with a statically-linked program written in
assembler which only does the 3 instructions needed to call _exit(0).Before:
$ perf stat -e 0:1:u ./three
Performance counter stats for './three':
4858 instructions
0.001274523 seconds time elapsed
After:
$ perf stat -e 0:1:u ./three
Performance counter stats for './three':
92 instructions
0.000468153 seconds time elapsed
Reported-by: Vince Weaver
Signed-off-by: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Peter expressed a strong preference for percentage based
display of scaled values - so revert to that from the
recently introduced multiplication-factor unit.Reported-by: Peter Zijlstra
Cc: Jaswinder Singh Rajput
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
28 Jun, 2009
2 commits
-
Set attrs and nr_counters if no event is selected and !null_run.
Setting of attrs should depend on number of counters,
so we need to memcpy only for sizeof(default_attrs)Also set nr_counters as ARRAY_SIZE(default_attrs) in place of
hardcoded value.Signed-off-by: Jaswinder Singh Rajput
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Increase size for event name to handle bigger names like
'L1-d$-prefetch-misses'Changed scaled counters from percentage to a multiplicative
factor because the latter is more expressive.Also aligned the scaling factor, otherwise sometimes it looks
like:384 iTLB-load-misses (4.74x scaled)
452029 branch-loads (8.00x scaled)
5892 branch-load-misses (20.39x scaled)
972315 iTLB-loads (3.24x scaled)Before:
150708 L1-d$-stores (scaled from 23.57%)
428804 L1-d$-prefetches (scaled from 23.47%)
314446 L1-d$-prefetch-misses (scaled from 23.42%)
252626137 L1-i$-loads (scaled from 23.24%)
5297550 dTLB-load-misses (scaled from 23.96%)
106992392 branch-loads (scaled from 23.67%)
5239561 branch-load-misses (scaled from 23.43%)After:
1731713 L1-d$-loads ( 14.25x scaled)
44241 L1-d$-prefetches ( 3.88x scaled)
21076 L1-d$-prefetch-misses ( 3.40x scaled)
5789421 L1-i$-loads ( 3.78x scaled)
29645 dTLB-load-misses ( 2.95x scaled)
461474 branch-loads ( 6.52x scaled)
7493 branch-load-misses ( 26.57x scaled)Reported-by: Ingo Molnar
Signed-off-by: Jaswinder Singh Rajput
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
27 Jun, 2009
2 commits
-
In multi-run (-r/--repeat) printouts, print out the noise of
the wall-clock average as well.Also, fix a bug in printing out scaled counters: if it was not
scaled then we should not update the average with -1.Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar -
Allow a no-counters run. This can be useful to measure just
elapsed wall-clock time - or to assess the raw overhead of perf
stat itself, without running any counters.Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
24 Jun, 2009
2 commits
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Remove dead code and do some code alignment.
Signed-off-by: Jaswinder Singh Rajput
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Error message should use stderr for verbose (-v), otherwise
message will be lost for:$ ./perf stat -v > /dev/null
For example on AMD bus-cycles event is not available so now
it looks like:$ ./perf stat -v -e bus-cycles ls > /dev/null
Error: counter 0, sys_perf_counter_open() syscall returned with -1 (Invalid argument)Performance counter stats for 'ls':
bus-cycles
0.006765877 seconds time elapsed.
Signed-off-by: Jaswinder Singh Rajput
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
20 Jun, 2009
1 commit
-
On 64-bit powerpc, __u64 is defined to be unsigned long rather than
unsigned long long. This causes compiler warnings every time we
print a __u64 value with %Lx.Rather than changing __u64, we define our own u64 to be unsigned long
long on all architectures, and similarly s64 as signed long long.
For consistency we also define u32, s32, u16, s16, u8 and s8. These
definitions are put in a new header, types.h, because these definitions
are needed in util/string.h and util/symbol.h.The main change here is the mechanical change of __[us]{64,32,16,8}
to remove the "__". The other changes are:* Create types.h
* Include types.h in perf.h, util/string.h and util/symbol.h
* Add types.h to the LIB_H definition in Makefile
* Added (u64) casts in process_overflow_event() and print_sym_table()
to kill two remaining warnings.Signed-off-by: Paul Mackerras
Acked-by: Peter Zijlstra
Cc: benh@kernel.crashing.org
LKML-Reference:
Signed-off-by: Ingo Molnar
13 Jun, 2009
3 commits
-
If -vv (very verbose) is specified, print out raw data
in the following format:$ perf stat -vv -r 3 ./loop_1b_instructions
[ perf stat: executing run #1 ... ]
[ perf stat: executing run #2 ... ]
[ perf stat: executing run #3 ... ]debug: runtime[0]: 235871872
debug: walltime[0]: 236646752
debug: runtime_cycles[0]: 755150182
debug: counter/0[0]: 235871872
debug: counter/1[0]: 235871872
debug: counter/2[0]: 235871872
debug: scaled[0]: 0
debug: counter/0[1]: 2
debug: counter/1[1]: 235870662
debug: counter/2[1]: 235870662
debug: scaled[1]: 0
debug: counter/0[2]: 1
debug: counter/1[2]: 235870437
debug: counter/2[2]: 235870437
debug: scaled[2]: 0
debug: counter/0[3]: 140
debug: counter/1[3]: 235870298
debug: counter/2[3]: 235870298
debug: scaled[3]: 0
debug: counter/0[4]: 755150182
debug: counter/1[4]: 235870145
debug: counter/2[4]: 235870145
debug: scaled[4]: 0
debug: counter/0[5]: 1001411258
debug: counter/1[5]: 235868838
debug: counter/2[5]: 235868838
debug: scaled[5]: 0
debug: counter/0[6]: 27897
debug: counter/1[6]: 235868560
debug: counter/2[6]: 235868560
debug: scaled[6]: 0
debug: counter/0[7]: 2910
debug: counter/1[7]: 235868151
debug: counter/2[7]: 235868151
debug: scaled[7]: 0
debug: runtime[0]: 235980257
debug: walltime[0]: 236770942
debug: runtime_cycles[0]: 755114546
debug: counter/0[0]: 235980257
debug: counter/1[0]: 235980257
debug: counter/2[0]: 235980257
debug: scaled[0]: 0
debug: counter/0[1]: 3
debug: counter/1[1]: 235980049
debug: counter/2[1]: 235980049
debug: scaled[1]: 0
debug: counter/0[2]: 1
debug: counter/1[2]: 235979907
debug: counter/2[2]: 235979907
debug: scaled[2]: 0
debug: counter/0[3]: 135
debug: counter/1[3]: 235979780
debug: counter/2[3]: 235979780
debug: scaled[3]: 0
debug: counter/0[4]: 755114546
debug: counter/1[4]: 235979652
debug: counter/2[4]: 235979652
debug: scaled[4]: 0
debug: counter/0[5]: 1001439771
debug: counter/1[5]: 235979304
debug: counter/2[5]: 235979304
debug: scaled[5]: 0
debug: counter/0[6]: 23723
debug: counter/1[6]: 235979050
debug: counter/2[6]: 235979050
debug: scaled[6]: 0
debug: counter/0[7]: 2213
debug: counter/1[7]: 235978820
debug: counter/2[7]: 235978820
debug: scaled[7]: 0
debug: runtime[0]: 235888002
debug: walltime[0]: 236700533
debug: runtime_cycles[0]: 754881504
debug: counter/0[0]: 235888002
debug: counter/1[0]: 235888002
debug: counter/2[0]: 235888002
debug: scaled[0]: 0
debug: counter/0[1]: 2
debug: counter/1[1]: 235887793
debug: counter/2[1]: 235887793
debug: scaled[1]: 0
debug: counter/0[2]: 1
debug: counter/1[2]: 235887645
debug: counter/2[2]: 235887645
debug: scaled[2]: 0
debug: counter/0[3]: 135
debug: counter/1[3]: 235887499
debug: counter/2[3]: 235887499
debug: scaled[3]: 0
debug: counter/0[4]: 754881504
debug: counter/1[4]: 235887368
debug: counter/2[4]: 235887368
debug: scaled[4]: 0
debug: counter/0[5]: 1001401731
debug: counter/1[5]: 235887024
debug: counter/2[5]: 235887024
debug: scaled[5]: 0
debug: counter/0[6]: 24212
debug: counter/1[6]: 235886786
debug: counter/2[6]: 235886786
debug: scaled[6]: 0
debug: counter/0[7]: 1824
debug: counter/1[7]: 235886560
debug: counter/2[7]: 235886560
debug: scaled[7]: 0Performance counter stats for '/home/mingo/loop_1b_instructions' (3 runs):
235.913377 task-clock-msecs # 0.997 CPUs ( +- 0.011% )
2 context-switches # 0.000 M/sec ( +- 0.000% )
1 CPU-migrations # 0.000 M/sec ( +- 0.000% )
136 page-faults # 0.001 M/sec ( +- 0.730% )
755048744 cycles # 3200.534 M/sec ( +- 0.009% )
1001417586 instructions # 1.326 IPC ( +- 0.001% )
25277 cache-references # 0.107 M/sec ( +- 3.988% )
2315 cache-misses # 0.010 M/sec ( +- 9.845% )0.236706075 seconds time elapsed.
This allows the summary stats to be validated.
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar -
Add the --repeat feature to perf stat, which repeats a given
command up to a 100 times, collects the stats and calculates an
average and a stddev.For example, the following oneliner 'perf stat' command runs hackbench
5 times and prints a tabulated result of all metrics, with averages
and noise levels (in percentage) printed:aldebaran:~/linux/linux/tools/perf> ./perf stat --repeat 5 ~/hackbench 10
Time: 0.117
Time: 0.108
Time: 0.089
Time: 0.088
Time: 0.100Performance counter stats for '/home/mingo/hackbench 10' (5 runs):
1243.989586 task-clock-msecs # 10.460 CPUs ( +- 4.720% )
47706 context-switches # 0.038 M/sec ( +- 19.706% )
387 CPU-migrations # 0.000 M/sec ( +- 3.608% )
17793 page-faults # 0.014 M/sec ( +- 0.354% )
3770941606 cycles # 3031.329 M/sec ( +- 4.621% )
1566372416 instructions # 0.415 IPC ( +- 2.703% )
16783421 cache-references # 13.492 M/sec ( +- 5.202% )
7128590 cache-misses # 5.730 M/sec ( +- 7.420% )0.118924455 seconds time elapsed.
The goal of this feature is to allow the reliance on these accurate
statistics and to know how many times a command has to be repeated
for the noise to go down to an acceptable level.(The -v option can be used to see a line printed out as each run progresses.)
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar -
- use IPC for the instruction normalization output
- CPUs for the CPU utilization factor value.
- print out time elapsed like the other rows
- tidy up the task-clocks/cpu-clocks printoutCc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
11 Jun, 2009
1 commit
-
Pure renames only, to PERF_COUNT_HW_* and PERF_COUNT_SW_*.
Signed-off-by: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
10 Jun, 2009
1 commit
-
Currently report and stat catch SIGINT (and others) without altering
their exit state. This means that things like:while :; do perf stat ./foo ; done
Loops become hard-to-interrupt, because bash never sees perf terminate
due to interruption. Fix this.Signed-off-by: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
08 Jun, 2009
1 commit
-
Before:
7549326754 cycles # 3201.811 M/sec
10007594937 instructions # 4244.408 M/secAfter:
7542051194 cycles # 3201.996 M/sec
10007743852 instructions # 4248.811 M/sec # 1.327 per cycleCc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar
07 Jun, 2009
2 commits
-
Before:
$ perf stat ~/hackbench 5
error: syscall returned with -1 (No such device)
After:
$ perf stat ~/hackbench 5
Time: 1.640Performance counter stats for '/home/mingo/hackbench 5':
6524.570382 task-clock-ticks # 3.838 CPU utilization factor
35704 context-switches # 0.005 M/sec
191 CPU-migrations # 0.000 M/sec
8958 page-faults # 0.001 M/sec
cycles
instructions
cache-references
cache-missesWall-clock time elapsed: 1699.999995 msecs
Also add -v (--verbose) option to allow the printing of failed
counter opens.Plus dont print 'inf' if wall-time is zero (due to jiffies granularity),
instead skip the printing of the CPU utilization factor.Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar -
Several people have suggested that 'perf' has become a full-fledged
tool that should be moved out of Documentation/. Move it to the
(new) tools/ directory.Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Ingo Molnar