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Dmitriy Vyukov 4e5086b993 runtime: improve Linux mutex 
The implementation is hybrid active/passive spin/blocking mutex.
The design minimizes amount of context switches and futex calls.
The idea is that all critical sections in runtime are intentially
small, so pure blocking mutex behaves badly causing
a lot of context switches, thread parking/unparking and kernel calls.
Note that some synthetic benchmarks become somewhat slower,
that's due to increased contention on other data structures,
it should not affect programs that do any real work.

On 2 x Intel E5620, 8 HT cores, 2.4GHz
benchmark                     old ns/op    new ns/op    delta
BenchmarkSelectContended         521.00       503.00   -3.45%
BenchmarkSelectContended-2       661.00       320.00  -51.59%
BenchmarkSelectContended-4      1139.00       629.00  -44.78%
BenchmarkSelectContended-8      2870.00       878.00  -69.41%
BenchmarkSelectContended-16     5276.00       818.00  -84.50%
BenchmarkChanContended           112.00       103.00   -8.04%
BenchmarkChanContended-2         631.00       174.00  -72.42%
BenchmarkChanContended-4         682.00       272.00  -60.12%
BenchmarkChanContended-8        1601.00       520.00  -67.52%
BenchmarkChanContended-16       3100.00       372.00  -88.00%
BenchmarkChanSync                253.00       239.00   -5.53%
BenchmarkChanSync-2             5030.00      4648.00   -7.59%
BenchmarkChanSync-4             4826.00      4694.00   -2.74%
BenchmarkChanSync-8             4778.00      4713.00   -1.36%
BenchmarkChanSync-16            5289.00      4710.00  -10.95%
BenchmarkChanProdCons0           273.00       254.00   -6.96%
BenchmarkChanProdCons0-2         599.00       400.00  -33.22%
BenchmarkChanProdCons0-4        1168.00       659.00  -43.58%
BenchmarkChanProdCons0-8        2831.00      1057.00  -62.66%
BenchmarkChanProdCons0-16       4197.00      1037.00  -75.29%
BenchmarkChanProdCons10          150.00       140.00   -6.67%
BenchmarkChanProdCons10-2        607.00       268.00  -55.85%
BenchmarkChanProdCons10-4       1137.00       404.00  -64.47%
BenchmarkChanProdCons10-8       2115.00       828.00  -60.85%
BenchmarkChanProdCons10-16      4283.00       855.00  -80.04%
BenchmarkChanProdCons100         117.00       110.00   -5.98%
BenchmarkChanProdCons100-2       558.00       218.00  -60.93%
BenchmarkChanProdCons100-4       722.00       287.00  -60.25%
BenchmarkChanProdCons100-8      1840.00       431.00  -76.58%
BenchmarkChanProdCons100-16     3394.00       448.00  -86.80%
BenchmarkChanProdConsWork0      2014.00      1996.00   -0.89%
BenchmarkChanProdConsWork0-2    1207.00      1127.00   -6.63%
BenchmarkChanProdConsWork0-4    1913.00       611.00  -68.06%
BenchmarkChanProdConsWork0-8    3016.00       949.00  -68.53%
BenchmarkChanProdConsWork0-16   4320.00      1154.00  -73.29%
BenchmarkChanProdConsWork10     1906.00      1897.00   -0.47%
BenchmarkChanProdConsWork10-2   1123.00      1033.00   -8.01%
BenchmarkChanProdConsWork10-4   1076.00       571.00  -46.93%
BenchmarkChanProdConsWork10-8   2748.00      1096.00  -60.12%
BenchmarkChanProdConsWork10-16  4600.00      1105.00  -75.98%
BenchmarkChanProdConsWork100    1884.00      1852.00   -1.70%
BenchmarkChanProdConsWork100-2  1235.00      1146.00   -7.21%
BenchmarkChanProdConsWork100-4  1217.00       619.00  -49.14%
BenchmarkChanProdConsWork100-8  1534.00       509.00  -66.82%
BenchmarkChanProdConsWork100-16 4126.00       918.00  -77.75%
BenchmarkSyscall                  34.40        33.30   -3.20%
BenchmarkSyscall-2               160.00       121.00  -24.38%
BenchmarkSyscall-4               131.00       136.00   +3.82%
BenchmarkSyscall-8               139.00       131.00   -5.76%
BenchmarkSyscall-16              161.00       168.00   +4.35%
BenchmarkSyscallWork             950.00       950.00   +0.00%
BenchmarkSyscallWork-2           481.00       480.00   -0.21%
BenchmarkSyscallWork-4           268.00       270.00   +0.75%
BenchmarkSyscallWork-8           156.00       169.00   +8.33%
BenchmarkSyscallWork-16          188.00       184.00   -2.13%
BenchmarkSemaSyntNonblock         36.40        35.60   -2.20%
BenchmarkSemaSyntNonblock-2       81.40        45.10  -44.59%
BenchmarkSemaSyntNonblock-4      126.00       108.00  -14.29%
BenchmarkSemaSyntNonblock-8      112.00       112.00   +0.00%
BenchmarkSemaSyntNonblock-16     110.00       112.00   +1.82%
BenchmarkSemaSyntBlock            35.30        35.30   +0.00%
BenchmarkSemaSyntBlock-2         118.00       124.00   +5.08%
BenchmarkSemaSyntBlock-4         105.00       108.00   +2.86%
BenchmarkSemaSyntBlock-8         101.00       111.00   +9.90%
BenchmarkSemaSyntBlock-16        112.00       118.00   +5.36%
BenchmarkSemaWorkNonblock        810.00       811.00   +0.12%
BenchmarkSemaWorkNonblock-2      476.00       414.00  -13.03%
BenchmarkSemaWorkNonblock-4      238.00       228.00   -4.20%
BenchmarkSemaWorkNonblock-8      140.00       126.00  -10.00%
BenchmarkSemaWorkNonblock-16     117.00       116.00   -0.85%
BenchmarkSemaWorkBlock           810.00       811.00   +0.12%
BenchmarkSemaWorkBlock-2         454.00       466.00   +2.64%
BenchmarkSemaWorkBlock-4         243.00       241.00   -0.82%
BenchmarkSemaWorkBlock-8         145.00       137.00   -5.52%
BenchmarkSemaWorkBlock-16        132.00       123.00   -6.82%
BenchmarkContendedSemaphore      123.00       102.00  -17.07%
BenchmarkContendedSemaphore-2     34.80        34.90   +0.29%
BenchmarkContendedSemaphore-4     34.70        34.80   +0.29%
BenchmarkContendedSemaphore-8     34.70        34.70   +0.00%
BenchmarkContendedSemaphore-16    34.80        34.70   -0.29%
BenchmarkMutex                    26.80        26.00   -2.99%
BenchmarkMutex-2                 108.00        45.20  -58.15%
BenchmarkMutex-4                 103.00       127.00  +23.30%
BenchmarkMutex-8                 109.00       147.00  +34.86%
BenchmarkMutex-16                102.00       152.00  +49.02%
BenchmarkMutexSlack               27.00        26.90   -0.37%
BenchmarkMutexSlack-2            149.00       165.00  +10.74%
BenchmarkMutexSlack-4            121.00       209.00  +72.73%
BenchmarkMutexSlack-8            101.00       158.00  +56.44%
BenchmarkMutexSlack-16            97.00       129.00  +32.99%
BenchmarkMutexWork               792.00       794.00   +0.25%
BenchmarkMutexWork-2             407.00       409.00   +0.49%
BenchmarkMutexWork-4             220.00       209.00   -5.00%
BenchmarkMutexWork-8             267.00       160.00  -40.07%
BenchmarkMutexWork-16            315.00       300.00   -4.76%
BenchmarkMutexWorkSlack          792.00       793.00   +0.13%
BenchmarkMutexWorkSlack-2        406.00       404.00   -0.49%
BenchmarkMutexWorkSlack-4        225.00       212.00   -5.78%
BenchmarkMutexWorkSlack-8        268.00       136.00  -49.25%
BenchmarkMutexWorkSlack-16       300.00       300.00   +0.00%
BenchmarkRWMutexWrite100          27.10        27.00   -0.37%
BenchmarkRWMutexWrite100-2        33.10        40.80  +23.26%
BenchmarkRWMutexWrite100-4       113.00        88.10  -22.04%
BenchmarkRWMutexWrite100-8       119.00        95.30  -19.92%
BenchmarkRWMutexWrite100-16      148.00       109.00  -26.35%
BenchmarkRWMutexWrite10           29.60        29.40   -0.68%
BenchmarkRWMutexWrite10-2        111.00        61.40  -44.68%
BenchmarkRWMutexWrite10-4        270.00       208.00  -22.96%
BenchmarkRWMutexWrite10-8        204.00       185.00   -9.31%
BenchmarkRWMutexWrite10-16       261.00       190.00  -27.20%
BenchmarkRWMutexWorkWrite100    1040.00      1036.00   -0.38%
BenchmarkRWMutexWorkWrite100-2   593.00       580.00   -2.19%
BenchmarkRWMutexWorkWrite100-4   470.00       365.00  -22.34%
BenchmarkRWMutexWorkWrite100-8   468.00       289.00  -38.25%
BenchmarkRWMutexWorkWrite100-16  604.00       374.00  -38.08%
BenchmarkRWMutexWorkWrite10      951.00       951.00   +0.00%
BenchmarkRWMutexWorkWrite10-2   1001.00       928.00   -7.29%
BenchmarkRWMutexWorkWrite10-4   1555.00      1006.00  -35.31%
BenchmarkRWMutexWorkWrite10-8   2085.00      1171.00  -43.84%
BenchmarkRWMutexWorkWrite10-16  2082.00      1614.00  -22.48%

R=rsc, iant, msolo, fw, iant
CC=golang-dev
https://golang.org/cl/4711045
2011-07-29 12:44:06 -04:00
..
386 runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
amd64 runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
arm runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
cgo cgo: windows amd64 port 2011-07-19 10:47:33 -04:00
darwin runtime: turn "too many EPIPE" into real SIGPIPE 2011-04-25 16:58:00 -04:00
debug gc: use more Go-like names for methods 2011-07-27 17:56:13 -04:00
freebsd runtime: fix freebsd build 2011-07-26 00:49:32 -04:00
linux runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
plan9 gc, runtime: fix range+panic line number bugs 2011-07-26 00:52:46 -04:00
pprof gc: unsafe.Alignof, unsafe.Offsetof, unsafe.Sizeof now return uintptr 2011-06-17 16:12:14 -04:00
windows cgo: windows amd64 port 2011-07-19 10:47:33 -04:00
append_test.go runtime: make TestSideEffectOrder work twice 2011-07-14 23:43:03 -04:00
cgocall.c runtime: replace centralized ncgocall counter with a distributed one 2011-07-21 11:29:08 -04:00
cgocall.h runtime: scheduler, cgo reorganization 2011-03-07 10:37:42 -05:00
chan_test.go runtime: fix compilation of send select cases 2011-07-25 12:25:37 -04:00
chan.c runtime: remove rnd calls that pass a second argument of 1 2011-07-24 22:03:17 -07:00
closure_test.go gc: make merely referencing an outer variable in a closure not force heapallocation. 2011-06-01 17:02:43 +02:00
complex.c runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
cpuprof.c gc: fix pprof deadlock 2011-07-28 21:03:40 -04:00
debug.go runtime: cpu profiling support 2011-03-23 11:43:37 -04:00
error.go gc: descriptive panic for nil pointer -> value method call 2011-06-17 15:23:27 -04:00
export_test.go runtime: faster entersyscall, exitsyscall 2011-07-19 11:01:17 -04:00
extern.go src/pkg: make package doc comments consistently start with "Package foo". 2011-04-20 09:57:05 +10:00
float.c runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
goc2c.c runtime: make goc2c build on Plan 9 2011-07-19 11:04:33 -04:00
hashmap.c runtime: remove rnd calls that pass a second argument of 1 2011-07-24 22:03:17 -07:00
hashmap.h runtime: replace runtime.mcpy with runtime.memmove 2011-07-12 17:30:40 -07:00
iface.c runtime: remove rnd calls that pass a second argument of 1 2011-07-24 22:03:17 -07:00
Makefile runtime: make goc2c build on Plan 9 2011-07-19 11:04:33 -04:00
malloc.goc runtime: add per-M caches for MemStats 2011-07-18 14:52:57 -04:00
malloc.h runtime: add per-M caches for MemStats 2011-07-18 14:56:22 -04:00
mcache.c runtime: add per-M caches for MemStats 2011-07-18 14:52:57 -04:00
mcentral.c runtime: faster allocator, garbage collector 2011-02-02 23:03:47 -05:00
mem.go runtime: add UpdateMemStats, use in tests 2011-07-22 00:55:01 -04:00
mfinal.c runtime: fix unused variable warning 2011-03-02 15:29:13 -05:00
mfixalloc.c runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
mgc0.c runtime: add UpdateMemStats, use in tests 2011-07-22 00:55:01 -04:00
mheap.c runtime: add per-M caches for MemStats 2011-07-18 14:52:57 -04:00
mkasmh.sh runtime: windows/amd64 port 2011-06-29 17:37:56 +10:00
mkgodefs.sh runtime: generate Go defs for C types. 2011-01-31 12:27:28 +01:00
mkversion.c runtime: fix mkversion to output valid path separators 2011-04-27 15:47:12 -04:00
mprof.goc pkg: spelling tweaks, I-Z 2011-05-30 18:02:59 +10:00
msize.c runtime: faster allocator, garbage collector 2011-02-02 23:03:47 -05:00
print.c runtime: fix data race on runtime·maxstring 2011-07-12 01:21:06 -04:00
proc_test.go runtime: faster entersyscall, exitsyscall 2011-07-19 11:01:17 -04:00
proc.c runtime: higher goroutine arg limit, clearer error 2011-07-27 12:41:46 -04:00
proc.p runtime: faster entersyscall/exitsyscall 2011-07-23 12:22:55 -04:00
rune.c runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
runtime1.goc runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
runtime-gdb.py pkg: spelling tweaks, I-Z 2011-05-30 18:02:59 +10:00
runtime.c gc, runtime: fix range+panic line number bugs 2011-07-26 00:52:46 -04:00
runtime.h runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
sema_test.go runtime: add Semacquire/Semrelease benchmarks 2011-06-28 11:15:24 -04:00
sema.goc runtime: replace Semacquire/Semrelease implementation 2011-06-28 15:09:53 -04:00
sig.go
sigqueue.goc runtime: ,s/[a-zA-Z0-9_]+/runtime·&/g, almost 2010-11-04 14:00:19 -04:00
slice.c gc: zero-width struct, zero-length array fixes 2011-07-27 16:47:45 -04:00
softfloat64_test.go arm: precise float64 software floating point 2010-10-25 17:55:50 -07:00
softfloat64.go go/printer, gofmt: fix alignment of "=" in const/var declarations 2011-05-09 15:16:34 -07:00
stack.h runtime: correct FixedStack value (fixes windows build) 2011-07-14 09:13:39 +10:00
string.goc runtime: improve Linux mutex 2011-07-29 12:44:06 -04:00
symtab.c gc: fix pprof deadlock 2011-07-28 21:03:40 -04:00
type.go reflect: allow Slice of arrays 2011-04-18 20:00:42 -04:00
type.h reflect: add pointer word to CommonType 2011-02-24 17:11:20 -05:00