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add cache size tests

This commit is contained in:
Rokas Puzonas 2024-03-01 00:44:20 +02:00
parent d275d207a7
commit 4fb4fdbc36
5 changed files with 119 additions and 13 deletions

22
src/cyclic_load_bytes.asm Normal file
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@ -0,0 +1,22 @@
global cyclic_load_bytes
section .text
; rdi - buffer
; rsi - byte_count
; rdx - mask
cyclic_load_bytes:
xor rcx, rcx
align 64
.loop:
mov r8, rcx
and r8, rdx
add r8, rdi
vmovdqu ymm0, [r8]
vmovdqu ymm0, [r8 + 32]
vmovdqu ymm0, [r8 + 64]
vmovdqu ymm0, [r8 + 96]
add rcx, 128
cmp rcx, rsi
jb .loop
ret

3
src/cyclic_load_bytes.h Normal file
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#include <stdint.h>
void cyclic_load_bytes(uint8_t *buffer, uint64_t byte_count, uint64_t mask);

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@ -165,6 +165,12 @@ static float divide_safe(float a, float b) {
return b != 0 ? a / b : 0;
}
float repetitor_get_best_bandwidth(struct repetitor *repetitor) {
uint64_t min_time_taken = repetitor->min_time_taken;
uint64_t min_byte_count = repetitor->min_byte_count;
return bytes_to_gb_s(repetitor, min_byte_count, min_time_taken);
}
void repetitor_print_results(struct repetitor *repetitor) {
uint64_t avg_time_taken = repetitor->total_time_taken/repetitor->repetition_count;
uint64_t min_time_taken = repetitor->min_time_taken;

75
src/tests/cache_size.c Normal file
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#include "repetition_tester.c"
#include "cyclic_load_bytes.h"
#include <sys/mman.h>
struct testcase {
char *name;
uint64_t mask;
};
struct testcase cases[] = {
{ .name = "load 4KiB" , .mask = 0b111111111111 },
{ .name = "load 8KiB" , .mask = 0b1111111111111 },
{ .name = "load 16KiB" , .mask = 0b11111111111111 },
{ .name = "load 32KiB" , .mask = 0b111111111111111 },
{ .name = "load 64KiB" , .mask = 0b1111111111111111 },
{ .name = "load 128KiB", .mask = 0b11111111111111111 },
{ .name = "load 512KiB", .mask = 0b1111111111111111111 },
{ .name = "load 1MiB" , .mask = 0b11111111111111111111 },
{ .name = "load 2MiB" , .mask = 0b111111111111111111111 },
{ .name = "load 4MiB" , .mask = 0b1111111111111111111111 },
{ .name = "load 8MiB" , .mask = 0b11111111111111111111111 },
{ .name = "load 16MiB" , .mask = 0b111111111111111111111111 },
{ .name = "load 32MiB" , .mask = 0b1111111111111111111111111 },
{ .name = "load 64MiB" , .mask = 0b11111111111111111111111111 },
{ .name = "load 128MiB", .mask = 0b111111111111111111111111111 },
{ .name = "load 1GiB" , .mask = 0b111111111111111111111111111111 },
};
int main() {
struct repetitor repetitor = {};
repetitor_init(&repetitor);
printf("CPU Frequency: %ldHz (~%.2fGHz)\n", repetitor.cpu_freq, (float)repetitor.cpu_freq/(1000*1000*1000));
uint64_t byte_count = 1024 * 1024 * 1024;
if (byte_count % 4096) {
printf("ERROR: Size of buffer is not page aligned\n");
return -1;
}
uint8_t *buffer = mmap(0, byte_count, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buffer == NULL) {
printf("ERROR: Failed to allocate buffer\n");
return -1;
}
if ((size_t)buffer % 64 != 0) {
printf("ERROR: Allocated buffer is not cache line aligned, it is %ld\n", (size_t)buffer % 64);
return -1;
}
// Touch pages so they would be mapped in, to avoid page faults during tests
for (uint64_t i = 0; i < byte_count; i += 4096) {
buffer[i] = (uint8_t)i;
}
for (int i = 0; i < ARRAY_LEN(cases); i++) {
struct testcase *testcase = &cases[i];
repetitor_clear(&repetitor);
while (repetitor_repeat(&repetitor, 2)) {
repetitor_start(&repetitor);
repetitor_measure_start(&repetitor);
cyclic_load_bytes(buffer, byte_count, testcase->mask);
repetitor_measure_stop(&repetitor, byte_count);
repetitor_stop(&repetitor);
}
repetitor_print_results_label(&repetitor, testcase->name);
// printf("%ld;%f\n", testcase->mask, repetitor_get_best_bandwidth(&repetitor));
}
munmap(buffer, byte_count);
return 0;
}

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@ -1,20 +1,20 @@
#include "repetition_tester.c"
#include "load_uop.h"
int main() {
typedef void (*test_cb)(uint8_t *buffer, uint64_t byte_count);
struct testcase {
typedef void (*test_cb)(uint8_t *buffer, uint64_t byte_count);
struct testcase {
char *name;
test_cb cb;
};
};
struct testcase cases[] = {
struct testcase cases[] = {
{ .name = "mov_load_x1()", .cb = mov_load_x1 },
{ .name = "mov_load_x2()", .cb = mov_load_x2 },
{ .name = "mov_load_x3()", .cb = mov_load_x3 },
{ .name = "mov_load_x4()", .cb = mov_load_x4 },
};
};
int main() {
struct repetitor repetitor = {};
repetitor_init(&repetitor);
printf("CPU Frequency: %ldHz (~%.2fGHz)\n", repetitor.cpu_freq, (float)repetitor.cpu_freq/(1000*1000*1000));