$ lscpu Architecture: x86_64 CPU 运行模式： 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 每个核的线程数：2 每个座的核数： 2 Socket(s): 1 NUMA 节点： 1 厂商 ID： GenuineIntel CPU 系列： 6 型号： 37 Model name: Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz 步进： 2 CPU MHz： 2400.000 CPU max MHz: 2400.0000 CPU min MHz: 1199.0000 BogoMIPS: 4788.23 虚拟化： VT-x L1d 缓存： 32K L1i 缓存： 32K L2 缓存： 256K L3 缓存： 3072K NUMA node0 CPU(s): 0-3 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt aes lahf_lm tpr_shadow vnmi flexpriority ept vpid dtherm ida arat

$ go test -bench=.* -benchtime 5s goos: linux goarch: amd64 BenchmarkAtomicAdd-4 1000000000 6.56 ns/op BenchmarkIntAdd-4 10000000000 0.69 ns/op PASS ok _/home/chuqq/work/codeeveryday/golang/20171001_go_atomic_bench 14.219s

use c/gcc

$ gcc c_atomic_bench.c $ ./a.out 1000000000 2430938 use value++: 0.002431 1000000000 8649885 use atomicadd: 0.008650