Created
June 20, 2022 12:57
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This is a gist for implementing parallelism in go
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package main | |
import ( | |
"log" | |
"runtime" | |
"runtime/pprof" | |
"sync" | |
"time" | |
) | |
// wg is used to wait for the program to finish. | |
var wg sync.WaitGroup | |
// threadProfile is a profile of threads created by the program. | |
var threadProfile = pprof.Lookup("threadcreate") | |
func parallelismInAction() { | |
// lock the current thread. | |
runtime.LockOSThread() | |
// defer the call to wg.Done(). | |
defer wg.Done() | |
// sleep | |
time.Sleep(time.Second * 2) | |
for i := 0; i < 5; i++ { | |
for j := 0; j < 100e6; j++ { | |
// some database instance operation mimicing. | |
} | |
} | |
// sleep | |
time.Sleep(time.Second * 2) | |
// unlock the current thread. | |
runtime.UnlockOSThread() | |
} | |
// init is called before main. | |
// init is predefined function in go like main(), but it is not mandatory to use it. | |
func init() { | |
// set the number of CPUs to use. | |
// By default, the number of CPUs is the number of CPUs on the machine. | |
// Just to show we can change the number of CPUs | |
// I have added this below command. | |
runtime.GOMAXPROCS(runtime.NumCPU()) | |
} | |
func main() { | |
// define the number of goroutines to use. | |
count := 10 | |
// add the number of goroutines to wait for. | |
wg.Add(count) | |
// log the number of threads created. | |
log.Println("Before thread count : ", threadProfile.Count()) | |
// loop through the number of goroutines. | |
for i := 0; i < count; i++ { | |
// call the parallelismInAction function. | |
go parallelismInAction() | |
} | |
// wait for the goroutines to finish. | |
wg.Wait() | |
// log the number of threads created. | |
log.Println("After thread count : ", threadProfile.Count()) | |
} |
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