b4296d7f88
Currently the crypto benchmarks are processing data in varying chunk sizes, over a fixed time period. This turns out to be a terrible idea because with small chunk sizes the overhead of checking the elapsed time on each loop iteration masks the true performance. Benchmarking over a fixed data size avoids the loop running any system calls which can interfere with the performance measurements. Before this change Enc chunk 512 bytes 2283.47 MB/sec Dec chunk 512 bytes 2236.23 MB/sec OK Enc chunk 4096 bytes 2744.97 MB/sec Dec chunk 4096 bytes 2614.71 MB/sec OK Enc chunk 16384 bytes 2777.53 MB/sec Dec chunk 16384 bytes 2678.44 MB/sec OK Enc chunk 65536 bytes 2809.34 MB/sec Dec chunk 65536 bytes 2699.47 MB/sec OK After this change Enc chunk 512 bytes 2058.22 MB/sec Dec chunk 512 bytes 2030.11 MB/sec OK Enc chunk 4096 bytes 2699.27 MB/sec Dec chunk 4096 bytes 2573.78 MB/sec OK Enc chunk 16384 bytes 2748.52 MB/sec Dec chunk 16384 bytes 2653.76 MB/sec OK Enc chunk 65536 bytes 2814.08 MB/sec Dec chunk 65536 bytes 2712.74 MB/sec OK The actual crypto performance hasn't changed, which shows how significant the mis-measurement has been for small data sizes. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* QEMU Crypto hash speed benchmark
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*
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* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
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*
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* Authors:
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* Longpeng(Mike) <longpeng2@huawei.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "crypto/init.h"
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#include "crypto/hash.h"
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static void test_hash_speed(const void *opaque)
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{
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size_t chunk_size = (size_t)opaque;
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uint8_t *in = NULL, *out = NULL;
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size_t out_len = 0;
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const size_t total = 2 * GiB;
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size_t remain;
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struct iovec iov;
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int ret;
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in = g_new0(uint8_t, chunk_size);
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memset(in, g_test_rand_int(), chunk_size);
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iov.iov_base = (char *)in;
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iov.iov_len = chunk_size;
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g_test_timer_start();
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remain = total;
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while (remain) {
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ret = qcrypto_hash_bytesv(QCRYPTO_HASH_ALG_SHA256,
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&iov, 1, &out, &out_len,
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NULL);
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g_assert(ret == 0);
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remain -= chunk_size;
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}
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g_test_timer_elapsed();
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g_print("sha256: ");
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g_print("Hash %zu GB chunk size %zu bytes ", total / GiB, chunk_size);
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g_print("%.2f MB/sec ", (double)total / MiB / g_test_timer_last());
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g_free(out);
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g_free(in);
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}
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int main(int argc, char **argv)
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{
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size_t i;
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char name[64];
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g_test_init(&argc, &argv, NULL);
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g_assert(qcrypto_init(NULL) == 0);
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for (i = 512; i <= 64 * KiB; i *= 2) {
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memset(name, 0 , sizeof(name));
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snprintf(name, sizeof(name), "/crypto/hash/speed-%zu", i);
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g_test_add_data_func(name, (void *)i, test_hash_speed);
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}
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return g_test_run();
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}
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