Re: [go-nuts] sync.Mutex encounter large performance drop when goroutine contention more than 3400

[Robert Engels]

Which is what I would expect - once the number of routines exhaust the cache, it will take the next level (or never since its main memory) to see an massive increase in time. 4800 is 30% slower than 3600 - so it is increasing linearly with the number of Go routines.

-----Original Message-----
From: changkun
Sent: Aug 26, 2019 11:49 AM
To: golang-nuts
Subject: Re: [go-nuts] sync.Mutex encounter large performance drop when goroutine contention more than 3400

According to your formula let's sample three points:

2400 goroutines: 2.508s/(50000000*2400) = 2.09 × 10^-11 s

3600 goroutines: 12.219s/(50000000*3600) = 6.78833333 × 10-11 seconds

4800 goroutines: 16.020s/(50000000*4800) = 6.67500 × 10^-11 s

One can observe that 3600 and 4800 mostly equal to each other, but they both three times slower than 2400.

goos: linux

goarch: amd64

BenchmarkMutexWrite/goroutines-2400-8           50000000                46.5 ns/op

PASS

ok      _/home/changkun/dev/tests       2.508s

goos: linux

goarch: amd64

BenchmarkMutexWrite/goroutines-3600-8           50000000               240 ns/op

PASS

ok      _/home/changkun/dev/tests       12.219s

goos: linux

goarch: amd64

BenchmarkMutexWrite/goroutines-4800-8           50000000               317 ns/op

PASS

ok      _/home/changkun/dev/tests       16.020s

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