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Message-Id: <1289574158-6959-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
Date: Sat, 13 Nov 2010 00:02:38 +0900
From: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org, mitake@....info.waseda.ac.jp,
h.mitake@...il.com, Ma Ling <ling.ma@...el.com>,
Zhao Yakui <yakui.zhao@...el.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Paul Mackerras <paulus@...ba.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] perf bench: print both of prefaulted and no prefaulted results
After applying this patch, perf bench mem memcpy prints
both of prefualted and without prefaulted score of memcpy().
New options --no-prefault and --only-prefault are added
for printing single result, mainly for scripting usage.
Example of usage:
| mitake@...1i:~/linux/.../tools/perf% ./perf bench mem memcpy -l 500MB
| # Running mem/memcpy benchmark...
| # Copying 500MB Bytes ...
|
| 634.969014 MB/Sec
| 4.828062 GB/Sec (with prefault)
| mitake@...1i:~/linux/.../tools/perf% ./perf bench mem memcpy -l 500MB --only-prefault
| # Running mem/memcpy benchmark...
| # Copying 500MB Bytes ...
|
| 4.705192 GB/Sec (with prefault)
| mitake@...1i:~/linux/.../tools/perf% ./perf bench mem memcpy -l 500MB --no-prefault
| # Running mem/memcpy benchmark...
| # Copying 500MB Bytes ...
|
| 642.725568 MB/Sec
Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Ma Ling <ling.ma@...el.com>
Cc: Zhao Yakui <yakui.zhao@...el.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: H. Peter Anvin <hpa@...or.com>
---
tools/perf/bench/mem-memcpy.c | 215 +++++++++++++++++++++++++++++------------
1 files changed, 152 insertions(+), 63 deletions(-)
diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
index be31ddb..61b6ead 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -25,7 +25,8 @@ static const char *length_str = "1MB";
static const char *routine = "default";
static bool use_clock;
static int clock_fd;
-static bool prefault;
+static bool only_prefault;
+static bool no_prefault;
static const struct option options[] = {
OPT_STRING('l', "length", &length_str, "1MB",
@@ -35,15 +36,19 @@ static const struct option options[] = {
"Specify routine to copy"),
OPT_BOOLEAN('c', "clock", &use_clock,
"Use CPU clock for measuring"),
- OPT_BOOLEAN('p', "prefault", &prefault,
- "Cause page faults before memcpy()"),
+ OPT_BOOLEAN('o', "only-prefault", &only_prefault,
+ "Show only the result with page faults before memcpy()"),
+ OPT_BOOLEAN('n', "no-prefault", &no_prefault,
+ "Show only the result without page faults before memcpy()"),
OPT_END()
};
+typedef void *(*memcpy_t)(void *, const void *, size_t);
+
struct routine {
const char *name;
const char *desc;
- void * (*fn)(void *dst, const void *src, size_t len);
+ memcpy_t fn;
};
struct routine routines[] = {
@@ -92,29 +97,98 @@ static double timeval2double(struct timeval *ts)
(double)ts->tv_usec / (double)1000000;
}
+static void alloc_mem(void **dst, void **src, size_t length)
+{
+ *dst = zalloc(length);
+ if (!dst)
+ die("memory allocation failed - maybe length is too large?\n");
+
+ *src = zalloc(length);
+ if (!src)
+ die("memory allocation failed - maybe length is too large?\n");
+}
+
+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;
+
+ alloc_mem(&src, &dst, len);
+
+ if (prefault)
+ fn(dst, src, len);
+
+ clock_start = get_clock();
+ fn(dst, src, len);
+ clock_end = get_clock();
+
+ free(src);
+ free(dst);
+ return clock_end - clock_start;
+}
+
+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;
+
+ alloc_mem(&src, &dst, len);
+
+ if (prefault)
+ fn(dst, src, len);
+
+ BUG_ON(gettimeofday(&tv_start, NULL));
+ fn(dst, src, len);
+ BUG_ON(gettimeofday(&tv_end, NULL));
+
+ timersub(&tv_end, &tv_start, &tv_diff);
+
+ free(src);
+ free(dst);
+ return (double)((double)len / timeval2double(&tv_diff));
+}
+
+#define pf (no_prefault ? 0 : 1)
+
+#define print_bps(x) do { \
+ if (x < K) \
+ printf(" %14lf B/Sec", x); \
+ else if (x < K * K) \
+ printf(" %14lfd KB/Sec", x / K); \
+ else if (x < K * K * K) \
+ printf(" %14lf MB/Sec", x / K / K); \
+ else \
+ printf(" %14lf GB/Sec", x / K / K / K); \
+ } while (0)
+
int bench_mem_memcpy(int argc, const char **argv,
const char *prefix __used)
{
int i;
- void *dst, *src;
- size_t length;
- double bps = 0.0;
- struct timeval tv_start, tv_end, tv_diff;
- u64 clock_start, clock_end, clock_diff;
+ size_t len;
+ double result_bps[2];
+ u64 result_clock[2];
- clock_start = clock_end = clock_diff = 0ULL;
argc = parse_options(argc, argv, options,
bench_mem_memcpy_usage, 0);
- tv_diff.tv_sec = 0;
- tv_diff.tv_usec = 0;
- length = (size_t)perf_atoll((char *)length_str);
+ if (use_clock)
+ init_clock();
+
+ len = (size_t)perf_atoll((char *)length_str);
- if ((s64)length <= 0) {
+ result_clock[0] = result_clock[1] = 0ULL;
+ result_bps[0] = result_bps[1] = 0.0;
+
+ if ((s64)len <= 0) {
fprintf(stderr, "Invalid length:%s\n", length_str);
return 1;
}
+ /* same to without specifying either of prefault and no-prefault */
+ if (only_prefault && no_prefault)
+ only_prefault = no_prefault = false;
+
for (i = 0; routines[i].name; i++) {
if (!strcmp(routines[i].name, routine))
break;
@@ -129,65 +203,80 @@ int bench_mem_memcpy(int argc, const char **argv,
return 1;
}
- dst = zalloc(length);
- if (!dst)
- die("memory allocation failed - maybe length is too large?\n");
-
- src = zalloc(length);
- if (!src)
- die("memory allocation failed - maybe length is too large?\n");
-
- if (bench_format == BENCH_FORMAT_DEFAULT) {
- printf("# Copying %s Bytes from %p to %p ...\n\n",
- length_str, src, dst);
- }
-
-
- if (prefault)
- routines[i].fn(dst, src, length);
-
- if (use_clock) {
- init_clock();
- clock_start = get_clock();
- } else {
- BUG_ON(gettimeofday(&tv_start, NULL));
- }
+ if (bench_format == BENCH_FORMAT_DEFAULT)
+ printf("# Copying %s Bytes ...\n\n", length_str);
- routines[i].fn(dst, src, length);
-
- if (use_clock) {
- clock_end = get_clock();
- clock_diff = clock_end - clock_start;
+ if (!only_prefault && !no_prefault) {
+ /* show both of results */
+ if (use_clock) {
+ result_clock[0] =
+ do_memcpy_clock(routines[i].fn, len, false);
+ result_clock[1] =
+ do_memcpy_clock(routines[i].fn, len, true);
+ } else {
+ result_bps[0] =
+ do_memcpy_gettimeofday(routines[i].fn,
+ len, false);
+ result_bps[1] =
+ do_memcpy_gettimeofday(routines[i].fn,
+ len, true);
+ }
} else {
- BUG_ON(gettimeofday(&tv_end, NULL));
- timersub(&tv_end, &tv_start, &tv_diff);
- bps = (double)((double)length / timeval2double(&tv_diff));
+ if (use_clock) {
+ result_clock[pf] =
+ do_memcpy_clock(routines[i].fn,
+ len, only_prefault);
+ } else {
+ result_bps[pf] =
+ do_memcpy_gettimeofday(routines[i].fn,
+ len, only_prefault);
+ }
}
switch (bench_format) {
case BENCH_FORMAT_DEFAULT:
- if (use_clock) {
- printf(" %14lf Clock/Byte\n",
- (double)clock_diff / (double)length);
- } else {
- if (bps < K)
- printf(" %14lf B/Sec\n", bps);
- else if (bps < K * K)
- printf(" %14lfd KB/Sec\n", bps / 1024);
- else if (bps < K * K * K)
- printf(" %14lf MB/Sec\n", bps / 1024 / 1024);
- else {
- printf(" %14lf GB/Sec\n",
- bps / 1024 / 1024 / 1024);
+ if (!only_prefault && !no_prefault) {
+ if (use_clock) {
+ printf(" %14lf Clock/Byte\n",
+ (double)result_clock[0]
+ / (double)len);
+ printf(" %14lf Clock/Byte (with prefault)\n",
+ (double)result_clock[1]
+ / (double)len);
+ } else {
+ print_bps(result_bps[0]);
+ printf("\n");
+ print_bps(result_bps[1]);
+ printf(" (with prefault)\n");
}
+ } else {
+ if (use_clock) {
+ printf(" %14lf Clock/Byte",
+ (double)result_clock[pf]
+ / (double)len);
+ } else
+ print_bps(result_bps[pf]);
+
+ printf("%s\n", only_prefault ? " (with prefault)" : "");
}
break;
case BENCH_FORMAT_SIMPLE:
- if (use_clock) {
- printf("%14lf\n",
- (double)clock_diff / (double)length);
- } else
- printf("%lf\n", bps);
+ if (!only_prefault && !no_prefault) {
+ if (use_clock) {
+ printf("%lf %lf\n",
+ (double)result_clock[0] / (double)len,
+ (double)result_clock[1] / (double)len);
+ } else {
+ printf("%lf %lf\n",
+ result_bps[0], result_bps[1]);
+ }
+ } else {
+ if (use_clock) {
+ printf("%lf\n", (double)result_clock[pf]
+ / (double)len);
+ } else
+ printf("%lf\n", result_bps[pf]);
+ }
break;
default:
/* reaching this means there's some disaster: */
--
1.7.1.1
--
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