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improve gem5 memory model and cpufreq experiments

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Ciro Santilli 六四事件 法轮功
2020-06-10 01:00:00 +00:00
parent eb22fd3b6e
commit 6a5b9673c7
4 changed files with 325 additions and 106 deletions
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28
userland/c/malloc_touch.c Normal file
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@@ -0,0 +1,28 @@
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-memory-latency */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
size_t nbytes, step;
if (argc > 1) {
nbytes = strtoull(argv[1], NULL, 0);
} else {
nbytes = 0x10;
}
if (argc > 2) {
step = strtoull(argv[2], NULL, 0);
} else {
step = 1;
}
char *base = malloc(nbytes);
assert(base);
char *i = base;
while (i < base + nbytes) {
*i = 13;
i += step;
}
return EXIT_SUCCESS;
}

6
userland/gcc/busy_loop.c
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@@ -8,9 +8,9 @@ void __attribute__ ((noinline)) busy_loop(
unsigned long long max,
unsigned long long max2
) {
for (unsigned long long i = 0; i < max; i++) {
for (unsigned long long j = 0; j < max2; j++) {
__asm__ __volatile__ ("" : "+g" (j), "+g" (j) : :);
for (unsigned long long i = 0; i < max2; i++) {
for (unsigned long long j = 0; j < max; j++) {
__asm__ __volatile__ ("" : "+g" (i), "+g" (j) : :);
}
}
}

24
userland/linux/sysconf.c
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@@ -5,11 +5,31 @@
#include <stdlib.h>
#include <unistd.h>
#define SYSCONF(x) printf("_SC_%-23s = %ld\n", #x, sysconf(_SC_ ## x))
int main(void) {
/* Number of processors, not considering affinity:
* http://stackoverflow.com/questions/2693948/how-do-i-retrieve-the-number-of-processors-on-c-linux */
printf("_SC_NPROCESSORS_ONLN = %ld\n", sysconf(_SC_NPROCESSORS_ONLN));
SYSCONF(NPROCESSORS_ONLN);
/* CPUs configured by OS during boot. Some may have gone offline, so could be larger than _SC_NPROCESSORS_ONLN.a */
printf("_SC_NPROCESSORS_CONF = %ld\n", sysconf(_SC_NPROCESSORS_CONF));
SYSCONF(NPROCESSORS_CONF);
/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-cache-size */
SYSCONF(LEVEL1_ICACHE_SIZE);
SYSCONF(LEVEL1_ICACHE_ASSOC);
SYSCONF(LEVEL1_ICACHE_LINESIZE);
SYSCONF(LEVEL1_DCACHE_SIZE);
SYSCONF(LEVEL1_DCACHE_ASSOC);
SYSCONF(LEVEL1_DCACHE_LINESIZE);
SYSCONF(LEVEL2_CACHE_SIZE);
SYSCONF(LEVEL2_CACHE_ASSOC);
SYSCONF(LEVEL2_CACHE_LINESIZE);
SYSCONF(LEVEL3_CACHE_SIZE);
SYSCONF(LEVEL3_CACHE_ASSOC);
SYSCONF(LEVEL3_CACHE_LINESIZE);
SYSCONF(LEVEL4_CACHE_SIZE);
SYSCONF(LEVEL4_CACHE_ASSOC);
SYSCONF(LEVEL4_CACHE_LINESIZE);
return EXIT_SUCCESS;
}