Looks like the name was changed to runtimecontentionstacks
Much better now…
(pprof) tree
Showing nodes accounting for 481.75ms, 100% of 481.75ms total
Dropped 39 nodes (cum <= 2.41ms)
----------------------------------------------------------+-------------
flat flat% sum% cum cum% calls calls% + context
----------------------------------------------------------+-------------
401.25ms 83.51% |
runtime.findRunnable (inline)
35.26ms 7.34% | runtime.sysmon
(inline)
17.37ms 3.62% | runtime.stopm
(inline)
14.01ms 2.92% |
runtime.saveBlockEventStack (inline)
6.07ms 1.26% |
runtime.goschedImpl (inline)
1.52ms 0.32% | runtime.schedule
(inline)
1.30ms 0.27% |
sync.(*Mutex).Unlock (inline)
1.30ms 0.27% |
github.com/robaho/go-trader/internal/exchange.sendMarketData (inline)
1.17ms 0.24% | sync.(*Map).Swap
(inline)
1.16ms 0.24% |
github.com/robaho/go-trader/internal/exchange.(*grpcServer).Connection (inline)
480.46ms 99.73% 99.73% 480.46ms 99.73% | runtime.unlock
but this seems suspect, that finding the runnable should consume so much time.
Is this a side effect of the scheduler, and it is really blocked in the unlock
call waiting for another routine to be runnable?
> On Jul 18, 2024, at 10:14 AM, 'Robert Engels' via golang-nuts
> <golang-nuts@googlegroups.com> wrote:
>
> I found this issue, https://github.com/golang/go/issues/57071
> <https://github.com/golang/go/issues/57071> and tried running with
>
> GODEBUG=profileruntimelocks=1
>
> but it made no difference in the output.
>
> I am using Go 1.22.4 on OSX.
>
> Any ideas how I can determine what is causing this high contention shown
> below:
>
> (pprof) tree
> Showing nodes accounting for 4440.35ms, 100% of 4440.35ms total
> ----------------------------------------------------------+-------------
> flat flat% sum% cum cum% calls calls% + context
>
> ----------------------------------------------------------+-------------
> 4324.17ms 97.38% 97.38% 4324.17ms 97.38% |
> runtime._LostContendedRuntimeLock
> ----------------------------------------------------------+-------------
> 116.17ms 100% |
> sync.(*Map).Swap (inline)
> 116.17ms 2.62% 100% 116.17ms 2.62% |
> sync.(*Mutex).Unlock
> ----------------------------------------------------------+-------------
> 116.17ms 100% |
> github.com/robaho/go-trader/internal/exchange
> <http://github.com/robaho/go-trader/internal/exchange>.(*grpcServer).massquote
> 0 0% 100% 116.17ms 2.62% |
> github.com/robaho/go-trader/internal/exchange
> <http://github.com/robaho/go-trader/internal/exchange>.(*exchange).Quote
> 116.17ms 100% |
> github.com/robaho/go-trader/internal/exchange.sendMarketData
> <http://github.com/robaho/go-trader/internal/exchange.sendMarketData>
>
>
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