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In this file, we are adding and deleting 10 million elements in a map and see how it works.
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| package main | |
| import ( | |
| "fmt" | |
| "runtime" | |
| ) | |
| func main() { | |
| n := 10000000 | |
| m := make(map[int][128]byte) | |
| // It will return 0 hence, at this point nothing is added it allocate elements after this | |
| printAlloc() | |
| // Adding 10 million elements | |
| for i := 0; i < n; i++ { | |
| m[i] = [128]byte{} | |
| } | |
| // It will return the output in MB, that how much memory it took to store 10 million element in memory | |
| printAlloc() | |
| // Deleting 10 million elements | |
| for i := 0; i < n; i++ { | |
| // https://pkg.go.dev/builtin#delete | |
| delete(m, i) | |
| } | |
| // Triggers a manual GC | |
| runtime.GC() | |
| // Here, it will return the memory after the deallocation of KV pairs in a map | |
| printAlloc() | |
| // Keeps a reference to m so that the map isn’t collected | |
| runtime.KeepAlive(m) | |
| } | |
| func printAlloc() { | |
| var m runtime.MemStats | |
| var convertToMB uint64 = 1048576 | |
| runtime.ReadMemStats(&m) | |
| fmt.Printf("%d MB\n", m.Alloc/convertToMB) | |
| } | |
| // Output - | |
| 0 MB | |
| 3694 MB | |
| 2347 MB |
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