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 use_cycle;
+static int cycle_fd;
static bool only_prefault;
static bool no_prefault;
static const struct option options[] = {
OPT_STRING('l', "length", &length_str, "1MB",
- "Specify length of memory to copy. "
- "available unit: B, MB, GB (upper and lower)"),
+ "Specify length of memory to set. "
+ "Available units: B, KB, MB, GB and TB (upper and lower)"),
OPT_STRING('r', "routine", &routine, "default",
- "Specify routine to copy"),
+ "Specify routine to set"),
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('c', "cycle", &use_cycle,
+ "Use cycles event instead of gettimeofday() for measuring"),
OPT_BOOLEAN('o', "only-prefault", &only_prefault,
"Show only the result with page faults before memset()"),
OPT_BOOLEAN('n', "no-prefault", &no_prefault,
NULL
};
-static struct perf_event_attr clock_attr = {
+static struct perf_event_attr cycle_attr = {
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES
};
-static void init_clock(void)
+static void init_cycle(void)
{
- clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
+ cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, 0);
- if (clock_fd < 0 && errno == ENOSYS)
+ if (cycle_fd < 0 && errno == ENOSYS)
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
else
- BUG_ON(clock_fd < 0);
+ BUG_ON(cycle_fd < 0);
}
-static u64 get_clock(void)
+static u64 get_cycle(void)
{
int ret;
u64 clk;
- ret = read(clock_fd, &clk, sizeof(u64));
+ ret = read(cycle_fd, &clk, sizeof(u64));
BUG_ON(ret != sizeof(u64));
return clk;
die("memory allocation failed - maybe length is too large?\n");
}
-static u64 do_memset_clock(memset_t fn, size_t len, bool prefault)
+static u64 do_memset_cycle(memset_t fn, size_t len, bool prefault)
{
- u64 clock_start = 0ULL, clock_end = 0ULL;
+ u64 cycle_start = 0ULL, cycle_end = 0ULL;
void *dst = NULL;
int i;
if (prefault)
fn(dst, -1, len);
- clock_start = get_clock();
+ cycle_start = get_cycle();
for (i = 0; i < iterations; ++i)
fn(dst, i, len);
- clock_end = get_clock();
+ cycle_end = get_cycle();
free(dst);
- return clock_end - clock_start;
+ return cycle_end - cycle_start;
}
static double do_memset_gettimeofday(memset_t fn, size_t len, bool prefault)
int i;
size_t len;
double result_bps[2];
- u64 result_clock[2];
+ u64 result_cycle[2];
argc = parse_options(argc, argv, options,
bench_mem_memset_usage, 0);
- if (use_clock)
- init_clock();
+ if (use_cycle)
+ init_cycle();
len = (size_t)perf_atoll((char *)length_str);
- result_clock[0] = result_clock[1] = 0ULL;
+ result_cycle[0] = result_cycle[1] = 0ULL;
result_bps[0] = result_bps[1] = 0.0;
if ((s64)len <= 0) {
if (!only_prefault && !no_prefault) {
/* show both of results */
- if (use_clock) {
- result_clock[0] =
- do_memset_clock(routines[i].fn, len, false);
- result_clock[1] =
- do_memset_clock(routines[i].fn, len, true);
+ if (use_cycle) {
+ result_cycle[0] =
+ do_memset_cycle(routines[i].fn, len, false);
+ result_cycle[1] =
+ do_memset_cycle(routines[i].fn, len, true);
} else {
result_bps[0] =
do_memset_gettimeofday(routines[i].fn,
len, true);
}
} else {
- if (use_clock) {
- result_clock[pf] =
- do_memset_clock(routines[i].fn,
+ if (use_cycle) {
+ result_cycle[pf] =
+ do_memset_cycle(routines[i].fn,
len, only_prefault);
} else {
result_bps[pf] =
switch (bench_format) {
case BENCH_FORMAT_DEFAULT:
if (!only_prefault && !no_prefault) {
- if (use_clock) {
- printf(" %14lf Clock/Byte\n",
- (double)result_clock[0]
+ if (use_cycle) {
+ printf(" %14lf Cycle/Byte\n",
+ (double)result_cycle[0]
/ (double)len);
- printf(" %14lf Clock/Byte (with prefault)\n ",
- (double)result_clock[1]
+ printf(" %14lf Cycle/Byte (with prefault)\n ",
+ (double)result_cycle[1]
/ (double)len);
} else {
print_bps(result_bps[0]);
printf(" (with prefault)\n");
}
} else {
- if (use_clock) {
- printf(" %14lf Clock/Byte",
- (double)result_clock[pf]
+ if (use_cycle) {
+ printf(" %14lf Cycle/Byte",
+ (double)result_cycle[pf]
/ (double)len);
} else
print_bps(result_bps[pf]);
break;
case BENCH_FORMAT_SIMPLE:
if (!only_prefault && !no_prefault) {
- if (use_clock) {
+ if (use_cycle) {
printf("%lf %lf\n",
- (double)result_clock[0] / (double)len,
- (double)result_clock[1] / (double)len);
+ (double)result_cycle[0] / (double)len,
+ (double)result_cycle[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]
+ if (use_cycle) {
+ printf("%lf\n", (double)result_cycle[pf]
/ (double)len);
} else
printf("%lf\n", result_bps[pf]);
projects / deliverable / linux.git / blobdiff