Waste memory

main.go

package main

import (
	"fmt"
	"runtime"
	"time"
)

func main() {
	// Store allocated memory to prevent garbage collection
	var memoryHogs [][]byte
	
	// Track allocated memory
	allocatedGB := 0
	
	// Allocation chunk size (1 GB)
	chunkSizeGB := 1
	chunkSizeBytes := chunkSizeGB * 1024 * 1024 * 1024
	
	fmt.Println("Starting memory allocation test...")
	fmt.Println("Will allocate memory in", chunkSizeGB, "GB chunks")
	
	// Print memory stats before we begin
	printMemStats()
	
	// Continue allocating until we fail
	for {
		// Try to allocate a chunk of memory
		fmt.Printf("Attempting to allocate %d GB chunk...\n", chunkSizeGB)
		
		// Allocate the memory
		chunk := make([]byte, chunkSizeBytes)
		
		// Touch the memory to ensure it's actually allocated
		// (just allocating isn't enough - we need to use it)
		for i := 0; i < chunkSizeBytes; i += 1024 * 1024 {
			chunk[i] = 1
		}
		
		// Add to our slice to prevent garbage collection
		memoryHogs = append(memoryHogs, chunk)
		
		// Update counter
		allocatedGB += chunkSizeGB
		
		// Print status
		fmt.Printf("Successfully allocated %d GB total\n", allocatedGB)
		printMemStats()
		
		// Small pause to allow for monitoring and to make the output readable
		time.Sleep(1 * time.Second)
	}
}

func printMemStats() {
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	
	fmt.Printf("Memory stats: Alloc = %v MiB, Sys = %v MiB\n",
		m.Alloc/1024/1024,
		m.Sys/1024/1024)
}