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authorWilco Dijkstra <wdijkstr@arm.com>2019-02-14 17:10:47 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2019-02-14 17:10:47 +0000
commit20d0195c714fe847183e4a303e55f4ae1242aecf (patch)
treeb7a6fb0188e41f9f1cfae901038df881a8132b44 /benchtests
parent3904fd85d3fdf0573e9a1e12e32bcd8cb246f549 (diff)
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Add missing bench-malloc-simple.c file.
Diffstat (limited to 'benchtests')
-rw-r--r--benchtests/bench-malloc-simple.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/benchtests/bench-malloc-simple.c b/benchtests/bench-malloc-simple.c
new file mode 100644
index 0000000..83203ff
--- /dev/null
+++ b/benchtests/bench-malloc-simple.c
@@ -0,0 +1,188 @@
+/* Benchmark malloc and free functions.
+ Copyright (C) 2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <sys/resource.h>
+#include "bench-timing.h"
+#include "json-lib.h"
+
+/* Benchmark the malloc/free performance of a varying number of blocks of a
+ given size. This enables performance tracking of the t-cache and fastbins.
+ It tests 3 different scenarios: single-threaded using main arena,
+ multi-threaded using thread-arena, and main arena with SINGLE_THREAD_P
+ false. */
+
+#define NUM_ITERS 200000
+#define NUM_ALLOCS 4
+#define MAX_ALLOCS 1600
+
+typedef struct
+{
+ size_t iters;
+ size_t size;
+ int n;
+ timing_t elapsed;
+} malloc_args;
+
+static void
+do_benchmark (malloc_args *args, int **arr)
+{
+ timing_t start, stop;
+ size_t iters = args->iters;
+ size_t size = args->size;
+ int n = args->n;
+
+ TIMING_NOW (start);
+
+ for (int j = 0; j < iters; j++)
+ {
+ for (int i = 0; i < n; i++)
+ arr[i] = malloc (size);
+
+ for (int i = 0; i < n; i++)
+ free (arr[i]);
+ }
+
+ TIMING_NOW (stop);
+
+ TIMING_DIFF (args->elapsed, start, stop);
+}
+
+static malloc_args tests[3][NUM_ALLOCS];
+static int allocs[NUM_ALLOCS] = { 25, 100, 400, MAX_ALLOCS };
+
+static void *
+thread_test (void *p)
+{
+ int **arr = (int**)p;
+
+ /* Run benchmark multi-threaded. */
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ do_benchmark (&tests[2][i], arr);
+
+ return p;
+}
+
+void
+bench (unsigned long size)
+{
+ size_t iters = NUM_ITERS;
+ int **arr = (int**) malloc (MAX_ALLOCS * sizeof (void*));
+ unsigned long res;
+
+ TIMING_INIT (res);
+
+ for (int t = 0; t <= 3; t++)
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ {
+ tests[t][i].n = allocs[i];
+ tests[t][i].size = size;
+ tests[t][i].iters = iters / allocs[i];
+
+ /* Do a quick warmup run. */
+ if (t == 0)
+ do_benchmark (&tests[0][i], arr);
+ }
+
+ /* Run benchmark single threaded in main_arena. */
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ do_benchmark (&tests[0][i], arr);
+
+ /* Run benchmark in a thread_arena. */
+ pthread_t t;
+ pthread_create (&t, NULL, thread_test, (void*)arr);
+ pthread_join (t, NULL);
+
+ /* Repeat benchmark in main_arena with SINGLE_THREAD_P == false. */
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ do_benchmark (&tests[1][i], arr);
+
+ free (arr);
+
+ json_ctx_t json_ctx;
+
+ json_init (&json_ctx, 0, stdout);
+
+ json_document_begin (&json_ctx);
+
+ json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
+
+ json_attr_object_begin (&json_ctx, "functions");
+
+ json_attr_object_begin (&json_ctx, "malloc");
+
+ char s[100];
+ double iters2 = iters;
+
+ json_attr_object_begin (&json_ctx, "");
+ json_attr_double (&json_ctx, "malloc_block_size", size);
+
+ struct rusage usage;
+ getrusage (RUSAGE_SELF, &usage);
+ json_attr_double (&json_ctx, "max_rss", usage.ru_maxrss);
+
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ {
+ sprintf (s, "main_arena_st_allocs_%04d_time", allocs[i]);
+ json_attr_double (&json_ctx, s, tests[0][i].elapsed / iters2);
+ }
+
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ {
+ sprintf (s, "main_arena_mt_allocs_%04d_time", allocs[i]);
+ json_attr_double (&json_ctx, s, tests[1][i].elapsed / iters2);
+ }
+
+ for (int i = 0; i < NUM_ALLOCS; i++)
+ {
+ sprintf (s, "thread_arena__allocs_%04d_time", allocs[i]);
+ json_attr_double (&json_ctx, s, tests[2][i].elapsed / iters2);
+ }
+
+ json_attr_object_end (&json_ctx);
+
+ json_attr_object_end (&json_ctx);
+
+ json_attr_object_end (&json_ctx);
+
+ json_document_end (&json_ctx);
+}
+
+static void usage (const char *name)
+{
+ fprintf (stderr, "%s: <alloc_size>\n", name);
+ exit (1);
+}
+
+int
+main (int argc, char **argv)
+{
+ long val = 16;
+ if (argc == 2)
+ val = strtol (argv[1], NULL, 0);
+
+ if (argc > 2 || val <= 0)
+ usage (argv[0]);
+
+ bench (val);
+
+ return 0;
+}