]>
git.proxmox.com Git - mirror_qemu.git/blob - tests/atomic64-bench.c
2 * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
4 * License: GNU GPL, version 2 or later.
5 * See the COPYING file in the top-level directory.
7 #include "qemu/osdep.h"
8 #include "qemu/thread.h"
9 #include "qemu/host-utils.h"
10 #include "qemu/processor.h"
21 static QemuThread
*threads
;
22 static struct thread_info
*th_info
;
23 static unsigned int n_threads
= 1;
24 static unsigned int n_ready_threads
;
25 static struct count
*counts
;
26 static unsigned int duration
= 1;
27 static unsigned int range
= 1024;
28 static bool test_start
;
29 static bool test_stop
;
31 static const char commands_string
[] =
32 " -d = duration in seconds\n"
33 " -n = number of threads\n"
34 " -r = range (will be rounded up to pow2)";
36 static void usage_complete(char *argv
[])
38 fprintf(stderr
, "Usage: %s [options]\n", argv
[0]);
39 fprintf(stderr
, "options:\n%s\n", commands_string
);
43 * From: https://en.wikipedia.org/wiki/Xorshift
44 * This is faster than rand_r(), and gives us a wider range (RAND_MAX is only
45 * guaranteed to be >= INT_MAX).
47 static uint64_t xorshift64star(uint64_t x
)
52 return x
* UINT64_C(2685821657736338717);
55 static void *thread_func(void *arg
)
57 struct thread_info
*info
= arg
;
59 atomic_inc(&n_ready_threads
);
60 while (!atomic_read(&test_start
)) {
64 while (!atomic_read(&test_stop
)) {
67 info
->r
= xorshift64star(info
->r
);
68 index
= info
->r
& (range
- 1);
69 atomic_read_i64(&counts
[index
].i64
);
75 static void run_test(void)
79 while (atomic_read(&n_ready_threads
) != n_threads
) {
83 atomic_set(&test_start
, true);
84 g_usleep(duration
* G_USEC_PER_SEC
);
85 atomic_set(&test_stop
, true);
87 for (i
= 0; i
< n_threads
; i
++) {
88 qemu_thread_join(&threads
[i
]);
92 static void create_threads(void)
96 threads
= g_new(QemuThread
, n_threads
);
97 th_info
= g_new(struct thread_info
, n_threads
);
98 counts
= g_malloc0_n(range
, sizeof(*counts
));
100 for (i
= 0; i
< n_threads
; i
++) {
101 struct thread_info
*info
= &th_info
[i
];
103 info
->r
= (i
+ 1) ^ time(NULL
);
105 qemu_thread_create(&threads
[i
], NULL
, thread_func
, info
,
106 QEMU_THREAD_JOINABLE
);
110 static void pr_params(void)
112 printf("Parameters:\n");
113 printf(" # of threads: %u\n", n_threads
);
114 printf(" duration: %u\n", duration
);
115 printf(" ops' range: %u\n", range
);
118 static void pr_stats(void)
120 unsigned long long val
= 0;
124 for (i
= 0; i
< n_threads
; i
++) {
125 val
+= th_info
[i
].accesses
;
127 tx
= val
/ duration
/ 1e6
;
129 printf("Results:\n");
130 printf("Duration: %u s\n", duration
);
131 printf(" Throughput: %.2f Mops/s\n", tx
);
132 printf(" Throughput/thread: %.2f Mops/s/thread\n", tx
/ n_threads
);
135 static void parse_args(int argc
, char *argv
[])
140 c
= getopt(argc
, argv
, "hd:n:r:");
146 usage_complete(argv
);
149 duration
= atoi(optarg
);
152 n_threads
= atoi(optarg
);
155 range
= pow2ceil(atoi(optarg
));
161 int main(int argc
, char *argv
[])
163 parse_args(argc
, argv
);