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update cache size tests

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This commit is contained in:
Rokas Puzonas 2024-03-13 21:52:42 +02:00
parent 4fb4fdbc36
commit cef071d28f
3 changed files with 72 additions and 44 deletions
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33
src/cyclic_load_bytes.asm
View File

@ -3,20 +3,25 @@ global cyclic_load_bytes
section .text
; rdi - buffer
; rsi - byte_count
; rdx - mask
; rsi - inner_loop_count
; rdx - outer_loop_count
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]
xor r8, r8
.outer_loop:
mov rcx, rdi
xor r9, r9
.inner_loop:
vmovdqu ymm0, [rcx]
vmovdqu ymm0, [rcx + 32]
vmovdqu ymm0, [rcx + 64]
vmovdqu ymm0, [rcx + 96]
add rcx, 128
cmp rcx, rsi
jb .loop
add r9, 128
cmp r9, rsi
jb .inner_loop
inc r8
cmp r8, rdx
jb .outer_loop
ret

2
src/cyclic_load_bytes.h
View File

@ -1,3 +1,3 @@
#include <stdint.h>
void cyclic_load_bytes(uint8_t *buffer, uint64_t byte_count, uint64_t mask);
void cyclic_load_bytes(uint8_t *buffer, uint64_t inner_loop_count, uint64_t outer_loop_count);

79
src/tests/cache_size.c
View File

@ -4,42 +4,60 @@
struct testcase {
char *name;
uint64_t mask;
uint64_t byte_count;
};
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 },
static uint64_t kibibytes(uint64_t count) {
return 1024 * count;
}
{ .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 },
static uint64_t mibibytes(uint64_t count) {
return 1024 * kibibytes(count);
}
static uint64_t gibibytes(uint64_t count) {
return 1024 * mibibytes(count);
}
{ .name = "load 1GiB" , .mask = 0b111111111111111111111111111111 },
};
int main() {
struct testcase cases[] = {
{ .name = "16KiB" , .byte_count = kibibytes(16) },
{ .name = "32KiB" , .byte_count = kibibytes(32) },
{ .name = "64KiB" , .byte_count = kibibytes(64) },
{ .name = "128KiB", .byte_count = kibibytes(128) },
{ .name = "256KiB", .byte_count = kibibytes(256) },
{ .name = "464KiB", .byte_count = kibibytes(464) },
{ .name = "480KiB", .byte_count = kibibytes(480) },
{ .name = "496KiB", .byte_count = kibibytes(496) },
{ .name = "512KiB", .byte_count = kibibytes(512) },
{ .name = "1MiB" , .byte_count = mibibytes(1) },
{ .name = "2MiB" , .byte_count = mibibytes(2) },
{ .name = "4MiB" , .byte_count = mibibytes(4) },
{ .name = "8MiB" , .byte_count = mibibytes(8) },
{ .name = "16MiB" , .byte_count = mibibytes(16) },
{ .name = "20MiB" , .byte_count = mibibytes(20) },
{ .name = "24MiB" , .byte_count = mibibytes(24) },
{ .name = "30MiB" , .byte_count = mibibytes(30) },
{ .name = "32MiB" , .byte_count = mibibytes(32) },
{ .name = "34MiB" , .byte_count = mibibytes(34) },
{ .name = "40MiB" , .byte_count = mibibytes(40) },
{ .name = "48MiB" , .byte_count = mibibytes(48) },
{ .name = "64MiB" , .byte_count = mibibytes(64) },
{ .name = "128MiB", .byte_count = mibibytes(128) },
};
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) {
uint64_t buffer_size = gibibytes(1);
if (buffer_size % 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);
uint8_t *buffer = mmap(0, buffer_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buffer == NULL) {
printf("ERROR: Failed to allocate buffer\n");
return -1;
@ -51,25 +69,30 @@ int main() {
}
// Touch pages so they would be mapped in, to avoid page faults during tests
for (uint64_t i = 0; i < byte_count; i += 4096) {
for (uint64_t i = 0; i < buffer_size; i += 4096) {
buffer[i] = (uint8_t)i;
}
for (int i = 0; i < ARRAY_LEN(cases); i++) {
struct testcase *testcase = &cases[i];
assert(testcase->byte_count % 128 == 0); // Must be divisible by 128
uint64_t outer_loop_count = buffer_size / testcase->byte_count;
uint64_t bytes_read = outer_loop_count * testcase->byte_count;
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);
cyclic_load_bytes(buffer, testcase->byte_count, outer_loop_count);
repetitor_measure_stop(&repetitor, bytes_read);
repetitor_stop(&repetitor);
}
repetitor_print_results_label(&repetitor, testcase->name);
// printf("%ld;%f\n", testcase->mask, repetitor_get_best_bandwidth(&repetitor));
// repetitor_print_results_label(&repetitor, testcase->name);
printf("%s;%f\n", testcase->name, repetitor_get_best_bandwidth(&repetitor));
}
munmap(buffer, byte_count);
munmap(buffer, buffer_size);
return 0;
}