[erlang-questions] msacc: much time spent in alloc and gc
Tue Aug 16 15:38:05 CEST 2016
We have a system which uses only 20—25% of available CPU. After that we see:
* increased run_queue
* increased scheduler active time
* decreased CPU usage
At first there were some problems visible with lcnt, but now (after fixes)
While the system is in troubled state, msacc shows in cumulative scheduler
* 19.3% alloc
* 19.3% gc
* 25.3% ets
* 12.3% emulator
* 10.0% bif
* (other times are quite low)
The system is 2x 10-core Xeon E5-2660 (with hyperthreading), so we have 40
We use OTP 19.0 with +MBas aoffcaobf +MBacul 0
Switching scheduler binding from unbound (no option) to default
(thread_no_node_processor_spread according to documentation) sligtly
increases the throughput, but the alloc/gc/ets times are still very high.
How do we inspect high alloc/gc scheduler times?
Is there a way to select the most suitable allocation strategies without
bruteforcing every option on every allocator type?
Maybe we are missing something? Any advice?
Danil Zagoskin | z@REDACTED
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