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munch: Add a simple userland program for chewing up lots of memory

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Andreas Kling 2019-12-26 11:48:34 +01:00
parent c1f8291ce4
commit 23591f2a95
1 changed files with 44 additions and 0 deletions
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Userland/munch.cpp Normal file
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#include <AK/Types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
int main(int argc, char** argv)
{
size_t limit = 0;
size_t bite_size = 0;
int interval = 0;
if (argc == 1) {
limit = 42 * MB;
bite_size = 1 * MB;
interval = 200000;
} else if (argc == 4) {
bite_size = atoi(argv[1]);
limit = atoi(argv[2]);
interval = atoi(argv[3]);
} else {
printf("usage: munch [bite_size limit interval]\n");
return 1;
}
size_t munched = 0;
printf("Munching %zu bytes every %d ms, stopping at %zu\n", bite_size, interval / 1000, limit);
for (;;) {
auto* ptr = mmap(nullptr, bite_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
if (ptr == MAP_FAILED) {
perror("mmap");
return 1;
}
memset(ptr, 0, bite_size);
munched += bite_size;
printf("Allocated: %zu\n", munched);
if (limit && munched >= limit) {
printf("All done!\n");
break;
}
usleep(interval);
}
return 0;
}