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authorWilco Dijkstra <wdijkstr@arm.com>2020-02-10 16:08:40 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2020-02-10 16:08:40 +0000
commit511c91b1144b7f32497ece3346463bb6b365f7d6 (patch)
tree97be070cfb160d34985cc78ec8decbdb6d0434c1 /benchtests
parent6d0d2eb1e73345abdcfa539787416dd63bffe0ab (diff)
downloadglibc-511c91b1144b7f32497ece3346463bb6b365f7d6.tar.gz
Improve random memcpy benchmark
Improve the random memcpy benchmark. Double the number of copies and increase the memory sizes tested to 512KB. Add a more detailed distribution of memcpy alignment and sizes up to 4096 based on SPEC2017 traces. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'benchtests')
-rw-r--r--benchtests/bench-memcpy-random.c86
1 files changed, 57 insertions, 29 deletions
diff --git a/benchtests/bench-memcpy-random.c b/benchtests/bench-memcpy-random.c
index d6a60a2eb0..c7b34ce3bf 100644
--- a/benchtests/bench-memcpy-random.c
+++ b/benchtests/bench-memcpy-random.c
@@ -16,61 +16,85 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#define MIN_PAGE_SIZE 131072
+#define MIN_PAGE_SIZE (512*1024+4096)
#define TEST_MAIN
#define TEST_NAME "memcpy"
#include "bench-string.h"
#include <assert.h>
#include "json-lib.h"
-IMPL (memcpy, 1)
+#define MAX_COPIES 8192
-#define NUM_COPIES 4096
+IMPL (memcpy, 1)
typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
-typedef struct { uint8_t align; uint8_t freq; } align_data_t;
+typedef struct { uint8_t align; uint16_t freq; } align_data_t;
-#define SIZE_NUM 1024
+#define SIZE_NUM 65536
#define SIZE_MASK (SIZE_NUM-1)
static uint8_t size_arr[SIZE_NUM];
-/* Frequency data for memcpy of less than 256 bytes based on SPEC2006. */
+/* Frequency data for memcpy of less than 4096 bytes based on SPEC2017. */
static freq_data_t size_freq[] =
{
- { 8, 576}, {104, 94}, { 24, 78}, { 48, 58}, { 32, 48}, { 16, 46},
- { 1, 30}, { 96, 12}, { 72, 11}, {216, 11}, {192, 8}, { 12, 7},
- {144, 5}, { 2, 4}, { 64, 4}, {120, 4}, { 4, 3}, { 40, 2},
- { 7, 2}, {168, 2}, {160, 2}, {128, 1}, { 3, 1}, { 9, 1},
- {176, 1}, {240, 1}, { 11, 1}, { 0, 1}, { 5, 1}, { 6, 1},
- { 80, 1}, { 52, 1}, {152, 1}, { 10, 1}, { 56, 1}, { 51, 1},
- { 14, 1}, {208, 1}, { 0, 0}
+{ 32, 22320}, { 16, 9554}, { 8, 8915}, {152, 5327}, { 4, 2159}, {292, 2035},
+{ 12, 1608}, { 24, 1343}, {1152, 895}, {144, 813}, {884, 733}, {284, 721},
+{120, 661}, { 2, 649}, {882, 550}, { 5, 475}, { 7, 461}, {108, 460},
+{ 10, 361}, { 9, 361}, { 6, 334}, { 3, 326}, {464, 308}, {2048, 303},
+{ 1, 298}, { 64, 250}, { 11, 197}, {296, 194}, { 68, 187}, { 15, 185},
+{192, 184}, {1764, 183}, { 13, 173}, {560, 126}, {160, 115}, {288, 96},
+{104, 96}, {1144, 83}, { 18, 80}, { 23, 78}, { 40, 77}, { 19, 68},
+{ 48, 63}, { 17, 57}, { 72, 54}, {1280, 51}, { 20, 49}, { 28, 47},
+{ 22, 46}, {640, 45}, { 25, 41}, { 14, 40}, { 56, 37}, { 27, 35},
+{ 35, 33}, {384, 33}, { 29, 32}, { 80, 30}, {4095, 22}, {232, 22},
+{ 36, 19}, {184, 17}, { 21, 17}, {256, 16}, { 44, 15}, { 26, 15},
+{ 31, 14}, { 88, 14}, {176, 13}, { 33, 12}, {1024, 12}, {208, 11},
+{ 62, 11}, {128, 10}, {704, 10}, {324, 10}, { 96, 10}, { 60, 9},
+{136, 9}, {124, 9}, { 34, 8}, { 30, 8}, {480, 8}, {1344, 8},
+{273, 7}, {520, 7}, {112, 6}, { 52, 6}, {344, 6}, {336, 6},
+{504, 5}, {168, 5}, {424, 5}, { 0, 4}, { 76, 3}, {200, 3},
+{512, 3}, {312, 3}, {240, 3}, {960, 3}, {264, 2}, {672, 2},
+{ 38, 2}, {328, 2}, { 84, 2}, { 39, 2}, {216, 2}, { 42, 2},
+{ 37, 2}, {1608, 2}, { 70, 2}, { 46, 2}, {536, 2}, {280, 1},
+{248, 1}, { 47, 1}, {1088, 1}, {1288, 1}, {224, 1}, { 41, 1},
+{ 50, 1}, { 49, 1}, {808, 1}, {360, 1}, {440, 1}, { 43, 1},
+{ 45, 1}, { 78, 1}, {968, 1}, {392, 1}, { 54, 1}, { 53, 1},
+{ 59, 1}, {376, 1}, {664, 1}, { 58, 1}, {272, 1}, { 66, 1},
+{2688, 1}, {472, 1}, {568, 1}, {720, 1}, { 51, 1}, { 63, 1},
+{ 86, 1}, {496, 1}, {776, 1}, { 57, 1}, {680, 1}, {792, 1},
+{122, 1}, {760, 1}, {824, 1}, {552, 1}, { 67, 1}, {456, 1},
+{984, 1}, { 74, 1}, {408, 1}, { 75, 1}, { 92, 1}, {576, 1},
+{116, 1}, { 65, 1}, {117, 1}, { 82, 1}, {352, 1}, { 55, 1},
+{100, 1}, { 90, 1}, {696, 1}, {111, 1}, {880, 1}, { 79, 1},
+{488, 1}, { 61, 1}, {114, 1}, { 94, 1}, {1032, 1}, { 98, 1},
+{ 87, 1}, {584, 1}, { 85, 1}, {648, 1}, {0, 0}
};
-#define ALIGN_NUM 256
+#define ALIGN_NUM 1024
#define ALIGN_MASK (ALIGN_NUM-1)
static uint8_t src_align_arr[ALIGN_NUM];
static uint8_t dst_align_arr[ALIGN_NUM];
-/* Source alignment frequency for memcpy based on SPEC2006. */
+/* Source alignment frequency for memcpy based on SPEC2017. */
static align_data_t src_align_freq[] =
{
- {16, 144}, {8, 86}, {3, 23}, {1, 3}, {0, 0}
+ {8, 300}, {16, 292}, {32, 168}, {64, 153}, {4, 79}, {2, 14}, {1, 18}, {0, 0}
};
-/* Destination alignment frequency for memcpy based on SPEC2006. */
+/* Destination alignment frequency for memcpy based on SPEC2017. */
static align_data_t dst_align_freq[] =
{
- {16, 197}, {8, 30}, {3, 23}, {1, 6}, {0, 0}
+ {8, 265}, {16, 263}, {64, 209}, {32, 174}, {4, 90}, {2, 10}, {1, 13}, {0, 0}
};
typedef struct
{
- uint16_t src;
- uint16_t dst;
- uint16_t len;
+ uint64_t src : 24;
+ uint64_t dst : 24;
+ uint64_t len : 16;
} copy_t;
-static copy_t copy[NUM_COPIES];
+static copy_t copy[MAX_COPIES];
typedef char *(*proto_t) (char *, const char *, size_t);
@@ -103,6 +127,9 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
timing_t start, stop, cur;
size_t iters = INNER_LOOP_ITERS_MEDIUM;
+ for (int j = 0; j < n; j++)
+ CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
+
TIMING_NOW (start);
for (int i = 0; i < iters; ++i)
for (int j = 0; j < n; j++)
@@ -117,16 +144,17 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
static void
do_test (json_ctx_t *json_ctx, size_t max_size)
{
- for (int i = 0; i < max_size; i++)
- buf1[i] = i * 3;
+ int i;
+
+ memset (buf1, 1, max_size);
/* Create a random set of copies with the given size and alignment
distributions. */
- for (int i = 0; i < NUM_COPIES; i++)
+ for (i = 0; i < MAX_COPIES; i++)
{
- copy[i].dst = (rand () & (max_size - 1)) | 1;
+ copy[i].dst = (rand () & (max_size - 1));
copy[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK];
- copy[i].src = (rand () & (max_size - 1)) | 3;
+ copy[i].src = (rand () & (max_size - 1));
copy[i].src &= ~src_align_arr[rand () & ALIGN_MASK];
copy[i].len = size_arr[rand () & SIZE_MASK];
}
@@ -136,7 +164,7 @@ do_test (json_ctx_t *json_ctx, size_t max_size)
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
- do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, copy, NUM_COPIES);
+ do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, copy, i);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
@@ -165,7 +193,7 @@ test_main (void)
json_array_end (&json_ctx);
json_array_begin (&json_ctx, "results");
- for (int i = 4; i <= 64; i = i * 2)
+ for (int i = 4; i <= 512; i = i * 2)
do_test (&json_ctx, i * 1024);
json_array_end (&json_ctx);