idea is from this article How We Saved 70K Cores Across 30 Mission-Critical Services (Large-Scale, Semi-Automated Go GC Tuning @Uber)
just call NewTuner when initializing app :
func initProcess() {
var (
inCgroup = true
percent = 70
)
go NewTuner(inCgroup, percent)
}
more tests are needed
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Based on scavenging policy, go will not return released memory to os immediately, but nextgc use heapMarked, it diff with memory usage
memory usage from /proc/ may be delay, when trigger gc, and may lead gc percent incorrectly.
I added some tests in #7 and some logging info and the tests logged:
2022/05/26 17:46:35 GC Tuner initialized. GOGC: 100 Target percentage: 70
2022/05/26 17:46:35 adjusting GOGC - from 100 to 582442.2222222222
2022/05/26 17:46:36 adjusting GOGC - from 100 to 43994.20740406999
2022/05/26 17:46:38 adjusting GOGC - from 582442 to 19957.129779857565
Seems like the values being calculated aren't a % and also like there is a bit of a race as one of the values didn't actually get set.
It seems better to use gogcturner as a sidecar to the project.
If your application runs on the host now, and then you want to change it to run on the Docker, you must change the code and compile the application once.
On the other hand, If you miss changing the env, it will make some strange mistake which maybe a little to trace.
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