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Code Issues Releases Wiki Activity

measure the time to create a thread

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This commit is contained in:
Stefan Lankes 2019-08-06 21:39:08 +02:00
parent 19699abb2e
commit e14829d99f
2 changed files with 31 additions and 26 deletions
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3
usr/benchmarks/CMakeLists.txt
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@ -5,7 +5,8 @@ project(hermit_benchmarks C)
if("${TARGET_ARCH}" STREQUAL "x86_64-hermit")
add_executable(basic basic.c)
target_link_libraries(basic pthread)
target_compile_options(basic PRIVATE -pthread)
target_link_libraries(basic -pthread)
add_executable(hg hg.c hist.c rdtsc.c run.c init.c opt.c report.c setup.c)

54
usr/benchmarks/basic.c
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@ -2,27 +2,10 @@
* Copyright (c) 2016, Stefan Lankes, RWTH Aachen University
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
* http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
* http://opensource.org/licenses/MIT>, at your option. This file may not be
* copied, modified, or distributed except according to those terms.
*/
#ifndef __hermit__
@ -35,6 +18,7 @@
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <pthread.h>
#ifndef __hermit__
#include <sys/syscall.h>
@ -51,7 +35,7 @@ static inline long mygetpid(void)
int sched_yield(void);
#endif
#define N 10000
#define N 10000000
#define M (256+1)
#define BUFFSZ (1ULL*1024ULL*1024ULL)
@ -61,7 +45,7 @@ static char* buff[M];
inline static unsigned long long rdtsc(void)
{
unsigned long lo, hi;
asm volatile ("rdtsc" : "=a"(lo), "=d"(hi) :: "memory");
asm volatile ("lfence; rdtsc; lfence" : "=a"(lo), "=d"(hi) :: "memory");
return ((unsigned long long) hi << 32ULL | (unsigned long long) lo);
}
#else
@ -70,18 +54,24 @@ inline static unsigned long long rdtsc(void)
unsigned int lo, hi;
unsigned int id;
asm volatile ("rdtscp" : "=a"(lo), "=c"(id), "=d"(hi));
asm volatile ("rdtscp; lfence" : "=a"(lo), "=c"(id), "=d"(hi));
return ((unsigned long long)hi << 32ULL | (unsigned long long)lo);
}
#endif
static void* thread_func(void* arg)
{
return rdtsc();
}
int main(int argc, char** argv)
{
long i, j, ret;
unsigned long long start, end;
unsigned long long sum, start, end;
const char str[] = "H";
size_t len = strlen(str);
pthread_t thr_handle;
printf("Determine systems performance\n");
printf("=============================\n");
@ -108,6 +98,19 @@ int main(int argc, char** argv)
printf("Average time for sched_yield: %lld cycles\n", (end - start) / N);
sum = 0;
for(i=0; i<10000; i++) {
start = rdtsc();
pthread_create(&thr_handle, NULL, thread_func, NULL);
sched_yield();
pthread_join(thr_handle, &start);
sum += rdtsc() - start;
}
printf("Average time to create a thread: %lld cycles\n", sum / 10000);
#if 0
// cache warm-up
buff[0] = (char*) malloc(BUFFSZ);
@ -129,6 +132,7 @@ int main(int argc, char** argv)
end = rdtsc();
printf("Average time for the first page access: %lld cycles\n", (end - start) / ((M-1)*BUFFSZ/4096));
#endif
#if 0
write(2, (const void *)str, len);