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5d765ada01
It shows both throughput (total bytes obtained in the test duration) and latecy for both arc4random and arc4random_buf with different sizes. Checked on x86_64-linux-gnu, aarch64-linux, and powerpc64le-linux-gnu.
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/* Benchmark utility functions.
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Prevent compiler to optimize away call. */
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#define DO_NOT_OPTIMIZE_OUT(value) \
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({ \
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__typeof (value) __v = (value); \
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asm volatile ("" : : "r,m" (__v) : "memory"); \
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__v; \
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})
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#ifndef START_ITER
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# define START_ITER (100000000)
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#endif
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/* bench_start reduces the random variations due to frequency scaling by
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executing a small loop with many memory accesses. START_ITER controls
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the number of iterations. */
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void bench_start (void);
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