X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;ds=sidebyside;f=tests%2Fbenchmark%2Ftest_cycles_per_loop.c;fp=tests%2Fbenchmark%2Ftest_cycles_per_loop.c;h=6ff100bf38b34e518d937d6bc34760db74c6b63b;hb=f5ab766ee2c8300cb00ca5878b1cb464f960a66d;hp=0000000000000000000000000000000000000000;hpb=a5bae03d59c22e57263b8610b9fed99738303cf0;p=urcu.git diff --git a/tests/benchmark/test_cycles_per_loop.c b/tests/benchmark/test_cycles_per_loop.c new file mode 100644 index 0000000..6ff100b --- /dev/null +++ b/tests/benchmark/test_cycles_per_loop.c @@ -0,0 +1,44 @@ +/* + * test_cycles_per_loop.c + * + * Userspace RCU library - test cycles per loop + * + * Copyright February 2009 - Mathieu Desnoyers + * + * 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 2 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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include +#include + +#define NR_LOOPS 1000000UL + +static inline void loop_sleep(unsigned long loops) +{ + while (loops-- != 0) + caa_cpu_relax(); +} + +int main() +{ + cycles_t time1, time2; + + time1 = caa_get_cycles(); + loop_sleep(NR_LOOPS); + time2 = caa_get_cycles(); + printf("CPU clock cycles per loop: %g\n", (time2 - time1) / + (double)NR_LOOPS); + return 0; +}