Initial commit.

1 files changed, 107 insertions, 0 deletions

diff --git a/membw.c b/membw.c
new file mode 100644
index 0000000..0ae9d7b
--- /dev/null
+++ b/membw.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2019 Anton Khirnov <anton@khirnov.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <sys/time.h>
+
+#define REPEATS_DEFAULT 10
+
+void membw_mem_write_avx(uint8_t *dst, size_t dstlen);
+void membw_mem_read_avx(uint8_t *src, size_t srclen);
+
+static inline int64_t gettime(void)
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
+}
+
+void print_usage(int argc, char **argv)
+{
+    fprintf(stderr,
+            "Usage: %s <N> [repeats]\n"
+            "\tN: array size in kB\n",
+            argv[0]);
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+    size_t N;
+    unsigned int repeats = REPEATS_DEFAULT;
+
+    uint8_t *mem;
+
+    int64_t start;
+    int64_t duration = 0;
+
+    if (argc < 2) {
+        print_usage(argc, argv);
+        return 1;
+    }
+
+    N = strtol(argv[1], NULL, 0);
+    if (N <= 0) {
+        fprintf(stderr, "Invalid N: %zu\n", N);
+        print_usage(argc, argv);
+        return 1;
+    }
+    N *= 1024;
+
+    if (argc >= 3) {
+        repeats = strtol(argv[2], NULL, 0);
+        if (repeats <= 0) {
+            fprintf(stderr, "Invalid repeats: %u\n", repeats);
+            return 1;
+        }
+    }
+
+    ret = posix_memalign((void**)&mem, 64, N);
+    if (ret != 0) {
+        fprintf(stderr, "Error allocating memory\n");
+        return 2;
+    }
+
+    start = gettime();
+
+    for (unsigned int i = 0; i < repeats; i++)
+        membw_mem_write_avx(mem, N);
+
+    duration = gettime() - start;
+
+    fprintf(stdout, "Written %u x %g MB in %g ms: write bandwidth: %g MB/s\n",
+            repeats, (double)N / (1024 * 1024), duration / 1e3,
+            (double)N * repeats / duration * 1e6 / (1024 * 1024));
+
+    start = gettime();
+
+    for (unsigned int i = 0; i < repeats; i++)
+        membw_mem_read_avx(mem, N);
+
+    duration = gettime() - start;
+
+    fprintf(stdout, "Read %u x %g MB in %g ms: read bandwidth: %g MB/s\n",
+            repeats, (double)N / (1024 * 1024), duration / 1e3,
+            (double)N * repeats / duration * 1e6 / (1024 * 1024));
+
+    free(mem);
+
+    return 0;
+}