diff options
Diffstat (limited to 'tools/perf/bench/mem-memset.c')
| -rw-r--r-- | tools/perf/bench/mem-memset.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/tools/perf/bench/mem-memset.c b/tools/perf/bench/mem-memset.c new file mode 100644 index 000000000000..e9079185bd72 --- /dev/null +++ b/tools/perf/bench/mem-memset.c @@ -0,0 +1,297 @@ +/* + * mem-memset.c + * + * memset: Simple memory set in various ways + * + * Trivial clone of mem-memcpy.c. + */ + +#include "../perf.h" +#include "../util/util.h" +#include "../util/parse-options.h" +#include "../util/header.h" +#include "bench.h" +#include "mem-memset-arch.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/time.h> +#include <errno.h> + +#define K 1024 + +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; +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)"), + 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, + "Show only the result with page faults before memset()"), + OPT_BOOLEAN('n', "no-prefault", &no_prefault, + "Show only the result without page faults before memset()"), + OPT_END() +}; + +typedef void *(*memset_t)(void *, int, size_t); + +struct routine { + const char *name; + const char *desc; + memset_t fn; +}; + +static const struct routine routines[] = { + { "default", + "Default memset() provided by glibc", + memset }, +#ifdef ARCH_X86_64 + +#define MEMSET_FN(fn, name, desc) { name, desc, fn }, +#include "mem-memset-x86-64-asm-def.h" +#undef MEMSET_FN + +#endif + + { NULL, + NULL, + NULL } +}; + +static const char * const bench_mem_memset_usage[] = { + "perf bench mem memset <options>", + NULL +}; + +static struct perf_event_attr clock_attr = { + .type = PERF_TYPE_HARDWARE, + .config = PERF_COUNT_HW_CPU_CYCLES +}; + +static void init_clock(void) +{ + clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0); + + if (clock_fd < 0 && errno == ENOSYS) + die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); + else + BUG_ON(clock_fd < 0); +} + +static u64 get_clock(void) +{ + int ret; + u64 clk; + + ret = read(clock_fd, &clk, sizeof(u64)); + BUG_ON(ret != sizeof(u64)); + + return clk; +} + +static double timeval2double(struct timeval *ts) +{ + return (double)ts->tv_sec + + (double)ts->tv_usec / (double)1000000; +} + +static void alloc_mem(void **dst, size_t length) +{ + *dst = zalloc(length); + if (!dst) + die("memory allocation failed - maybe length is too large?\n"); +} + +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); + + if (prefault) + fn(dst, -1, len); + + clock_start = get_clock(); + for (i = 0; i < iterations; ++i) + fn(dst, i, len); + clock_end = get_clock(); + + free(dst); + return clock_end - clock_start; +} + +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); + + if (prefault) + fn(dst, -1, len); + + BUG_ON(gettimeofday(&tv_start, NULL)); + for (i = 0; i < iterations; ++i) + fn(dst, i, len); + BUG_ON(gettimeofday(&tv_end, NULL)); + + timersub(&tv_end, &tv_start, &tv_diff); + + 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_memset(int argc, const char **argv, + const char *prefix __used) +{ + int i; + size_t len; + double result_bps[2]; + u64 result_clock[2]; + + argc = parse_options(argc, argv, options, + bench_mem_memset_usage, 0); + + if (use_clock) + init_clock(); + + len = (size_t)perf_atoll((char *)length_str); + + 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; + } + if (!routines[i].name) { + printf("Unknown routine:%s\n", routine); + printf("Available routines...\n"); + for (i = 0; routines[i].name; i++) { + printf("\t%s ... %s\n", + routines[i].name, routines[i].desc); + } + return 1; + } + + if (bench_format == BENCH_FORMAT_DEFAULT) + printf("# Copying %s Bytes ...\n\n", length_str); + + 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); + } else { + result_bps[0] = + do_memset_gettimeofday(routines[i].fn, + len, false); + result_bps[1] = + do_memset_gettimeofday(routines[i].fn, + len, true); + } + } else { + if (use_clock) { + result_clock[pf] = + do_memset_clock(routines[i].fn, + len, only_prefault); + } else { + result_bps[pf] = + do_memset_gettimeofday(routines[i].fn, + len, only_prefault); + } + } + + switch (bench_format) { + case BENCH_FORMAT_DEFAULT: + 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 (!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: */ + die("unknown format: %d\n", bench_format); + break; + } + + return 0; +} |