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HUGE memory optimisations with long long ints

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ari melody 2024-02-12 01:17:10 +00:00
parent cd1b5f2d32
commit ea68d67619
Signed by: ari
GPG key ID: CF99829C92678188
2 changed files with 20 additions and 17 deletions
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1
.gitignore vendored
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*.exe *.exe
**/.DS_Store **/.DS_Store
bin/

36
main.c
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#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <conio.h>
int main() { int main() {
long long unsigned int size = 0; unsigned long long int size = 0;
unsigned int gib = 0;
printf("please enter the number of bytes (GiB) you would like to allocate (i.e. 4 = 4GiB):\n> "); printf("please enter the number of gibibytes (GiB) you would like to allocate (1 GiB = 1073741824 bytes):\n> ");
int digit = 0; unsigned int digit = 0;
while (1) { while (1) {
char input = getchar(); unsigned char input = getchar();
if (input == '\n') break; if (input == '\n') break;
if (input < '0' || input > '9') continue; if (input < '0' || input > '9') continue;
char number = input - 48; if (digit > 0) gib = gib * 10;
if (digit > 0) number = number * 10 * digit;
if (input == '0') number = 10 * digit;
size = size + number; gib = gib + (unsigned int) input - 48;
digit++; digit++;
} }
size = size * 1024 * 1024 * 1024; size = (unsigned long long int) gib * 1024 * 1024 * 1024;
printf("you are about to allocate %llu bytes of heap memory. are you sure? (y/n)\n> ", size); printf("you are about to allocate %d GiB (%llu bytes) of heap memory. are you sure? (y/n)\n> ", gib, size);
char input = getchar(); unsigned char input = getchar();
if (input != 'y') return 0; if (input != 'y') return 0;
while (getchar() != '\n'); while (getchar() != '\n');
printf("please wait...\n"); printf("please wait");
char* wtf = (char*) malloc(size * sizeof(char)); unsigned long long int* wtf = (unsigned long long int*) malloc(size);
for (long long unsigned int i = 0; i < size; i++) { for (unsigned long long int i = 0; i < size / sizeof(long long int); i++) {
wtf[i] = 255; wtf[i] = 0x80085;
if (i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) printf(".");
} }
printf("\n");
printf("%llu bytes of heap memory has been allocated. you are insane.\n", size); printf("%d GiB (%llu bytes) of heap memory has been allocated. you are insane.\n", gib, size);
printf("press any key to release this memory, or CTRL+C to exit the program.\n"); printf("press ENTER to release this memory, or CTRL+C to exit the program.\n");
getchar(); getchar();