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perf bench: Allow passing an iteration count to "bench mem mem{cpy,set}"

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"perf stat ... perf bench mem mem..." is pretty meaningless when using
small block sizes (as the overhead of the invocation of each test run
basically hides the actual test result in the noise). Repeating the
actually interesting function's invocation a number of times allows the
results to become meaningful.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4F16D767020000780006D738@nat28.tlf.novell.com
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jan Beulich 2012-01-18 13:29:59 +00:00 committed by Arnaldo Carvalho de Melo
parent be3de80dc2
commit e3e877e79b
2 changed files with 18 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
tools/perf/bench/mem-memcpy.c
View file

@ -24,6 +24,7 @@
static const char *length_str = "1MB";
static const char *routine = "default";
static int iterations = 1;
static bool use_clock;
static int clock_fd;
static bool only_prefault;
@ -35,6 +36,8 @@ static const struct option options[] = {
"available unit: B, MB, GB (upper and lower)"),
OPT_STRING('r', "routine", &routine, "default",
"Specify routine to copy"),
OPT_INTEGER('i', "iterations", &iterations,
"repeat memcpy() invocation this number of times"),
OPT_BOOLEAN('c', "clock", &use_clock,
"Use CPU clock for measuring"),
OPT_BOOLEAN('o', "only-prefault", &only_prefault,
@ -121,6 +124,7 @@ static u64 do_memcpy_clock(memcpy_t fn, size_t len, bool prefault)
{
u64 clock_start = 0ULL, clock_end = 0ULL;
void *src = NULL, *dst = NULL;
int i;
alloc_mem(&src, &dst, len);
@ -128,7 +132,8 @@ static u64 do_memcpy_clock(memcpy_t fn, size_t len, bool prefault)
fn(dst, src, len);
clock_start = get_clock();
fn(dst, src, len);
for (i = 0; i < iterations; ++i)
fn(dst, src, len);
clock_end = get_clock();
free(src);
@ -140,6 +145,7 @@ static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
{
struct timeval tv_start, tv_end, tv_diff;
void *src = NULL, *dst = NULL;
int i;
alloc_mem(&src, &dst, len);
@ -147,7 +153,8 @@ static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
fn(dst, src, len);
BUG_ON(gettimeofday(&tv_start, NULL));
fn(dst, src, len);
for (i = 0; i < iterations; ++i)
fn(dst, src, len);
BUG_ON(gettimeofday(&tv_end, NULL));
timersub(&tv_end, &tv_start, &tv_diff);

11
tools/perf/bench/mem-memset.c
View file

@ -24,6 +24,7 @@
static const char *length_str = "1MB";
static const char *routine = "default";
static int iterations = 1;
static bool use_clock;
static int clock_fd;
static bool only_prefault;
@ -35,6 +36,8 @@ static const struct option options[] = {
"available unit: B, MB, GB (upper and lower)"),
OPT_STRING('r', "routine", &routine, "default",
"Specify routine to copy"),
OPT_INTEGER('i', "iterations", &iterations,
"repeat memset() invocation this number of times"),
OPT_BOOLEAN('c', "clock", &use_clock,
"Use CPU clock for measuring"),
OPT_BOOLEAN('o', "only-prefault", &only_prefault,
@ -117,6 +120,7 @@ static u64 do_memset_clock(memset_t fn, size_t len, bool prefault)
{
u64 clock_start = 0ULL, clock_end = 0ULL;
void *dst = NULL;
int i;
alloc_mem(&dst, len);
@ -124,7 +128,8 @@ static u64 do_memset_clock(memset_t fn, size_t len, bool prefault)
fn(dst, -1, len);
clock_start = get_clock();
fn(dst, 0, len);
for (i = 0; i < iterations; ++i)
fn(dst, i, len);
clock_end = get_clock();
free(dst);
@ -135,6 +140,7 @@ static double do_memset_gettimeofday(memset_t fn, size_t len, bool prefault)
{
struct timeval tv_start, tv_end, tv_diff;
void *dst = NULL;
int i;
alloc_mem(&dst, len);
@ -142,7 +148,8 @@ static double do_memset_gettimeofday(memset_t fn, size_t len, bool prefault)
fn(dst, -1, len);
BUG_ON(gettimeofday(&tv_start, NULL));
fn(dst, 0, len);
for (i = 0; i < iterations; ++i)
fn(dst, i, len);
BUG_ON(gettimeofday(&tv_end, NULL));
timersub(&tv_end, &tv_start, &tv_diff);