goroutine leak at cache.go:1079 - `runJanitor` about go-cache HOT 5 OPEN

The test counts the number of goroutines at the beginning and at the end. You need to clean up the memory (garbage collection) before terminating the test. Golang typically does this with a delay. Before releasing an object from memory, the Golang calls a finalizer that terminates the goroutine.
Finalizer registration in code: https://github.com/patrickmn/go-cache/blob/master/cache.go#L1123
About finalizer: https://medium.com/a-journey-with-go/go-finalizers-786df8e17687
About garbage collection: https://tip.golang.org/doc/gc-guide

from go-cache.

it's work

import (
	"runtime"
	"testing"
	"time"

	"github.com/patrickmn/go-cache"
	"go.uber.org/goleak"
)

func leaktest(t *testing.T) {
	defer goleak.VerifyNone(t)
	cache.New(5*time.Minute, 10*time.Minute)
	runtime.GC()
}

func main() {
	testSuite := []testing.InternalTest{{Name: "leaktest", F: leaktest}}
	testing.Main(func(a, b string) (bool, error) { return a == b, nil }, testSuite, nil, nil)
}

from go-cache.

I am also getting the similar kind of error as follows

range_service  | goroutine 876 [select, 2 minutes]:
range_service  | github.com/patrickmn/go-cache.(*janitor).Run(0xc001627fb0, 0xc0011b9140?)
range_service  | 	/Users/jay/go/pkg/mod/github.com/patrickmn/[email protected]+incompatible/cache.go:1079 +0x85
range_service  | created by github.com/patrickmn/go-cache.runJanitor
range_service  | 	/Users/jay/go/pkg/mod/github.com/patrickmn/[email protected]+incompatible/cache.go:1099 +0xed
range_service  |
range_service  | goroutine 877 [select, 5 minutes]:
range_service  | github.com/patrickmn/go-cache.(*janitor).Run(0xc001634050, 0x0?)
range_service  | 	/Users/jay/go/pkg/mod/github.com/patrickmn/[email protected]+incompatible/cache.go:1079 +0x85
range_service  | created by github.com/patrickmn/go-cache.runJanitor
range_service  | 	/Users/jay/go/pkg/mod/github.com/patrickmn/[email protected]+incompatible/cache.go:1099 +0xed

@vithnilica Can you explain how runtime.GC() is helping and when to call this function. I am really new to go and don't understand much about memory leaks and all so can you please give an example to explain it better.

Thanks

from go-cache.

It is not memory leaks (or goroutine leak). "go.uber.org/goleak" test does not wait for "garbage collector".

from go-cache.

It is not memory leaks (or goroutine leak). "go.uber.org/goleak" test does not wait for "garbage collector".

Can you please explain why I am getting the error(cause of the error) and how will adding a routine.GC() after every cache creation helps to resolve the error.

from go-cache.