[PATCH 04/23] perf bench: Default to all routines in 'perf bench mem'

From: Arnaldo Carvalho de Melo
Date: Mon Oct 19 2015 - 17:45:46 EST


From: Ingo Molnar <mingo@xxxxxxxxxx>

So few people know that the --routine option to 'perf bench memcpy/memset'
exists, and would not know that it's capable of testing the kernel's
memcpy/memset implementations.

Furthermore, 'perf bench mem all' will not run all routines:

vega:~> perf bench mem all
# Running mem/memcpy benchmark...
Routine default (Default memcpy() provided by glibc)
# Copying 1MB Bytes ...

894.454383 MB/Sec
3.844734 GB/Sec (with prefault)

# Running mem/memset benchmark...
Routine default (Default memset() provided by glibc)
# Copying 1MB Bytes ...

1.220703 GB/Sec
9.042245 GB/Sec (with prefault)

Because misleadingly the 'all' refers to 'all sub-benchmarks', not 'all
sub-benchmarks and routines'.

Fix all this by making the memcpy/memset routine to default to 'all',
which results in all the benchmarks being run:

triton:~> perf bench mem all
# Running mem/memcpy benchmark...
Routine default (Default memcpy() provided by glibc)
# Copying 1MB Bytes ...

1.448906 GB/Sec
4.957170 GB/Sec (with prefault)
Routine x86-64-unrolled (unrolled memcpy() in arch/x86/lib/memcpy_64.S)
# Copying 1MB Bytes ...

1.614153 GB/Sec
4.379204 GB/Sec (with prefault)
Routine x86-64-movsq (movsq-based memcpy() in arch/x86/lib/memcpy_64.S)
# Copying 1MB Bytes ...

1.570036 GB/Sec
4.264465 GB/Sec (with prefault)
Routine x86-64-movsb (movsb-based memcpy() in arch/x86/lib/memcpy_64.S)
# Copying 1MB Bytes ...

1.788576 GB/Sec
6.554111 GB/Sec (with prefault)

# Running mem/memset benchmark...
Routine default (Default memset() provided by glibc)
# Copying 1MB Bytes ...

2.082223 GB/Sec
9.126752 GB/Sec (with prefault)
Routine x86-64-unrolled (unrolled memset() in arch/x86/lib/memset_64.S)
# Copying 1MB Bytes ...

5.710892 GB/Sec
8.346688 GB/Sec (with prefault)
Routine x86-64-stosq (movsq-based memset() in arch/x86/lib/memset_64.S)
# Copying 1MB Bytes ...

9.765625 GB/Sec
12.520032 GB/Sec (with prefault)
Routine x86-64-stosb (movsb-based memset() in arch/x86/lib/memset_64.S)
# Copying 1MB Bytes ...

9.668936 GB/Sec
12.682630 GB/Sec (with prefault)

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Hitoshi Mitake <mitake@xxxxxxxxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1445241870-24854-3-git-send-email-mingo@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/bench/mem-memcpy.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
index 27606ff5c4f9..263f84171ae5 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -24,7 +24,7 @@
#define K 1024

static const char *length_str = "1MB";
-static const char *routine = "default";
+static const char *routine = "all";
static int iterations = 1;
static bool use_cycle;
static int cycle_fd;
@@ -35,7 +35,7 @@ static const struct option options[] = {
OPT_STRING('l', "length", &length_str, "1MB",
"Specify length of memory to copy. "
"Available units: B, KB, MB, GB and TB (upper and lower)"),
- OPT_STRING('r', "routine", &routine, "default",
+ OPT_STRING('r', "routine", &routine, "all",
"Specify routine to copy, \"all\" runs all available routines"),
OPT_INTEGER('i', "iterations", &iterations,
"repeat memcpy() invocation this number of times"),
--
2.1.0

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