• Russ Cox's avatar
    runtime: faster entersyscall, exitsyscall · 025abd53
    Russ Cox authored
    Uses atomic memory accesses to avoid the need to acquire
    and release schedlock on fast paths.
    
    benchmark                            old ns/op    new ns/op    delta
    runtime_test.BenchmarkSyscall               73           31  -56.63%
    runtime_test.BenchmarkSyscall-2            538           74  -86.23%
    runtime_test.BenchmarkSyscall-3            508          103  -79.72%
    runtime_test.BenchmarkSyscall-4            721           97  -86.52%
    runtime_test.BenchmarkSyscallWork          920          873   -5.11%
    runtime_test.BenchmarkSyscallWork-2        516          481   -6.78%
    runtime_test.BenchmarkSyscallWork-3        550          343  -37.64%
    runtime_test.BenchmarkSyscallWork-4        632          263  -58.39%
    
    (Intel Core i7 L640 2.13 GHz-based Lenovo X201s)
    
    Reduced a less artificial server benchmark
    from 11.5r 12.0u 8.0s to 8.3r 9.1u 1.0s.
    
    R=dvyukov, r, bradfitz, r, iant, iant
    CC=golang-dev
    https://golang.org/cl/4723042
    025abd53
proc_test.go 2.28 KB