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$ go version
go version go1.19 darwin/arm64
$ perf script --header
# arch : x86_64
# nrcpus online : 104
# nrcpus avail : 104
# cpudesc : Intel(R) Xeon(R) Platinum 8269CY CPU @ 2.50GHz
# cpuid : GenuineIntel,6,85,7
running my program
lower system cpu usage.
system cpu cost about 30 core.
user cpu cost is only 60 core!
i use perf to record callstack and tran it to pprof.
the pprof top means that function native_queued_spin_lock_slowpath cost most cpu.
hear is the pprof flamegraph, seems that runtime.freespan is the reason.
the memory usage of my machine.
the pprof file:
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