Performance Test: Low Memory

Natarajan Santhosh

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Sep 19, 2023

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# on ec2 instance
sudo yum install -y gcc

gcc -o hog_mem_1210 hog_mem.c
./hog_mem_1210

# to experiment since resource usage can vary between instance types
# change the memory to hog e.g. 1210 to 1500
# compile e.g.  gcc -o hog_mem_1500 hog_mem.c
# run ./hog_mem_1500

#include <stdlib.h>
#include <stdio.h>

int main() {
    //1210 for c5.large
    size_t memory_to_hog = 1210 * 1024 * 1024; // 1000 MB in bytes
    char *memory = malloc(memory_to_hog);

    if (memory == NULL) {
        perror("Memory allocation failed");
        return 1;
    }

    // Fill the allocated memory to prevent it from being optimized away
    for (size_t i = 0; i < memory_to_hog; ++i) {
        memory[i] = i % 256;
    }

    printf("Allocated %lu bytes of memory\n", memory_to_hog);

    // Keep the program running indefinitely
    while (1) {
    }

    return 0;
}