eeca3ba92f
The following performance improvements have been made to the low-level atomic functions for ppc64le & ppc64: - For those cases containing a lwarx and stwcx (or other sizes): sync, lwarx, maybe something, stwcx, loop to sync, sync, isync The sync is moved before (outside) the lwarx/stwcx loop, and the sync after is removed, so it becomes: sync, lwarx, maybe something, stwcx, loop to lwarx, isync - For the Or8 and And8, the shifting and manipulation of the address to the word aligned version were removed and the instructions were changed to use lbarx, stbcx instead of register shifting, xor, then lwarx, stwcx. - New instructions LWSYNC, LBAR, STBCC were tested and added. runtime/atomic_ppc64x.s was changed to use the LWSYNC opcode instead of the WORD encoding. Fixes #15469 Ran some of the benchmarks in the runtime and sync directories. Some results varied from run to run but the trend was improvement based on best times for base and new: runtime.test: BenchmarkChanNonblocking-128 0.88 0.89 +1.14% BenchmarkChanUncontended-128 569 511 -10.19% BenchmarkChanContended-128 63110 53231 -15.65% BenchmarkChanSync-128 691 598 -13.46% BenchmarkChanSyncWork-128 11355 11649 +2.59% BenchmarkChanProdCons0-128 2402 2090 -12.99% BenchmarkChanProdCons10-128 1348 1363 +1.11% BenchmarkChanProdCons100-128 1002 746 -25.55% BenchmarkChanProdConsWork0-128 2554 2720 +6.50% BenchmarkChanProdConsWork10-128 1909 1804 -5.50% BenchmarkChanProdConsWork100-128 1624 1580 -2.71% BenchmarkChanCreation-128 237 212 -10.55% BenchmarkChanSem-128 705 667 -5.39% BenchmarkChanPopular-128 5081190 4497566 -11.49% BenchmarkCreateGoroutines-128 532 473 -11.09% BenchmarkCreateGoroutinesParallel-128 35.0 34.7 -0.86% BenchmarkCreateGoroutinesCapture-128 4923 4200 -14.69% sync.test: BenchmarkUncontendedSemaphore-128 112 94.2 -15.89% BenchmarkContendedSemaphore-128 133 128 -3.76% BenchmarkMutexUncontended-128 1.90 1.67 -12.11% BenchmarkMutex-128 353 310 -12.18% BenchmarkMutexSlack-128 304 283 -6.91% BenchmarkMutexWork-128 554 541 -2.35% BenchmarkMutexWorkSlack-128 567 556 -1.94% BenchmarkMutexNoSpin-128 275 242 -12.00% BenchmarkMutexSpin-128 1129 1030 -8.77% BenchmarkOnce-128 1.08 0.96 -11.11% BenchmarkPool-128 29.8 27.4 -8.05% BenchmarkPoolOverflow-128 40564 36583 -9.81% BenchmarkSemaUncontended-128 3.14 2.63 -16.24% BenchmarkSemaSyntNonblock-128 1087 1069 -1.66% BenchmarkSemaSyntBlock-128 897 893 -0.45% BenchmarkSemaWorkNonblock-128 1034 1028 -0.58% BenchmarkSemaWorkBlock-128 949 886 -6.64% Change-Id: I4403fb29d3cd5254b7b1ce87a216bd11b391079e Reviewed-on: https://go-review.googlesource.com/22549 Reviewed-by: Michael Munday <munday@ca.ibm.com> Reviewed-by: Minux Ma <minux@golang.org> |
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README.md
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Go is the work of hundreds of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
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Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
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Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See https://golang.org/doc/install or doc/install.html for more details.