// Copyright © 2018 Inanc Gumus // Learn Go Programming Course // License: https://creativecommons.org/licenses/by-nc-sa/4.0/ // // For more tutorials : https://learngoprogramming.com // In-person training : https://www.linkedin.com/in/inancgumus/ // Follow me on twitter: https://twitter.com/inancgumus package api import ( "fmt" "math/rand" "runtime" ) // DO NOT TOUCH THIS FILE BUT YOU CAN READ IT // Read returns a huge slice (allocates ~65 MB of memory) func Read() []int { // 2 << 22 means 2^(22 + 1) // See this: https://en.wikipedia.org/wiki/Arithmetic_shift // Perm function returns a slice with random integers in it. // Here it returns a slice with random integers that contains // 8,388,608 elements. One int value is 8 bytes. // So: 8,388,608 * 8 = ~65MB return rand.Perm(2 << 22) } // Report cleans the memory and prints the current memory usage // Don't worry about this code. You don't need to understand it. // // However, if you're curious, read on. // // The following code runs the garbage collector to clean // up the allocated resources, and then it reads the current // memory statistics into the m variable. func Report() { var m runtime.MemStats runtime.GC() runtime.ReadMemStats(&m) fmt.Printf(" > Memory Usage: %v KB\n", m.Alloc/1024) }