Comments (5)
stevej
commented on July 26, 2024
Mean time (which is not a great way to compare but we don't have enough precision with only microsecond timing) difference is 5ns vs 1.7us for each loop iteration.
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stevej
commented on July 26, 2024
In this zipfile are the flame graphs of both branches, each running the multithread benchmark loop 50MM times: flame_graphs.zip
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stevej
commented on July 26, 2024
Top cpu users from perf report for master.
+ 38.36% 0.00% multithread [unknown] [k] 0000000000000000 ▒
+ 35.26% 2.31% multithread [kernel.kallsyms] [k] entry_SYSCALL_64_fastpath ▒
+ 26.84% 0.31% multithread [kernel.kallsyms] [k] sys_futex ▒
+ 26.53% 0.37% multithread [kernel.kallsyms] [k] do_futex ▒
+ 23.96% 0.51% multithread libc-2.24.so [.] __lll_unlock_wake_private ▒
+ 23.12% 0.00% multithread [unknown] [k] 0x0000000000000001 ▒
+ 21.16% 1.23% multithread [kernel.kallsyms] [k] futex_wake ▒
+ 19.45% 19.45% multithread [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore ▒
+ 17.51% 0.05% multithread [kernel.kallsyms] [k] wake_up_q ▒
+ 17.44% 0.04% multithread [kernel.kallsyms] [k] try_to_wake_up ▒
+ 11.00% 10.95% multithread libc-2.24.so [.] _int_free ▒
+ 9.66% 0.00% multithread [unknown] [.] 0x0000558d7b0e78b0 ▒
+ 7.64% 7.59% multithread libc-2.24.so [.] malloc ▒
+ 6.70% 1.78% multithread libc-2.24.so [.] __lll_lock_wait_private ▒
+ 6.31% 6.25% multithread multithread [.] _ZN73_$LT$tacho..aggregator..Aggregator$u20$as$u20$```
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stevej
commented on July 26, 2024
Top cpu users from perf report for ver/synchro-system
+ 33.61% 6.36% multithread [vdso] [.] __vdso_clock_gettime
+ 27.14% 8.26% multithread [kernel.kallsyms] [k] entry_SYSCALL_64_fastpath
+ 26.12% 0.00% multithread [unknown] [k] 0x0000000000000001
+ 15.93% 1.23% multithread [kernel.kallsyms] [k] sys_clock_gettime
+ 14.78% 0.27% multithread [kernel.kallsyms] [k] posix_ktime_get_ts
+ 14.58% 1.62% multithread [kernel.kallsyms] [k] ktime_get_ts64
+ 14.38% 0.00% multithread multithread [.] _ZN50_$LT$F$u20$as$u20$alloc..boxed..FnBox$LT$A$GT$$GT
+ 14.38% 0.00% multithread libpthread-2.24.so [.] start_thread
+ 12.84% 0.35% multithread [kernel.kallsyms] [k] kvm_clock_get_cycles
+ 12.72% 12.72% multithread [kernel.kallsyms] [k] pvclock_clocksource_read
+ 10.10% 10.10% multithread multithread [.] _ZN56_$LT$twox_hash..XxHash$u20$as$u20$core..hash..Has
+ 9.32% 0.72% multithread libc-2.24.so [.] __clock_gettime
+ 8.28% 8.28% multithread libpthread-2.24.so [.] __pthread_rwlock_wrlock
+ 8.25% 8.25% multithread libpthread-2.24.so [.] __pthread_rwlock_unlock
+ 8.03% 8.03% multithread multithread [.] _ZN56_$LT$twox_hash..XxHash$u20$as$u20$core..hash..Has
+ 6.27% 0.00% multithread [unknown] [.] 0x0000000000000002
+ 6.26% 0.00% multithread [unknown] [.] 0x0000000000000004
+ 6.26% 0.00% multithread [unknown] [.] 0x000072656b726f77
+ 4.05% 4.05% multithread multithread [.] _ZN3std11collections4hash5table9make_hash17h79b66d50
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stevej
commented on July 26, 2024
Closed now that #7 is merged.
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