Aleksey Shipilëv shipilev
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| https://github.com/shipilev/benchmarks-scratch/blob/master/src/main/java/org/sample/StringToUTF8.java | |
| It is always prudent to verify "sample" mode with "avgt", because timestamping overhead/accuracy | |
| might skew the results in "sample". | |
| Benchmark (length) Mode Samples Mean Mean error Units | |
| o.s.StringToUTF8.getBytesViaWriter 1 avgt 5 1.301 0.198 us/op | |
| o.s.StringToUTF8.getBytesViaWriter 10 avgt 5 1.287 0.048 us/op | |
| o.s.StringToUTF8.getBytesViaWriter 100 avgt 5 1.605 0.240 us/op | |
| o.s.StringToUTF8.getBytesViaWriter 1000 avgt 5 4.727 0.766 us/op |
shipilev
/ BipartiteVsCompositeBenchmark.java
Last active
August 29, 2015 13:59
— forked from buchgr/BipartiteVsCompositeBenchmark.java
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| /* | |
| * Copyright 2014 The Netty Project | |
| * | |
| * The Netty Project licenses this file to you under the Apache License, | |
| * version 2.0 (the "License"); you may not use this file except in compliance | |
| * with the License. You may obtain a copy of the License at: | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software |
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| It looks like test is affected by where the guard variable is residing, this changeset isolates it: | |
| http://hg.openjdk.java.net/code-tools/jcstress/rev/39a1c4786c47 | |
| On x86_64, it can not fail without compiler being involved, since x86 is TSO: | |
| $ jdk8/bin/java -XX:-RestrictContended -jar tests-custom/target/jcstress.jar -t ".*UnfencedAcquireReleaseTest.*" -v -iters 20 -f 5 | |
| Observed state Occurrences Expectation Interpretation | |
| [0, 0] ( 27,588,422) ACCEPTABLE Before observing releasing write to, any value is OK for ... | |
| [0, 1] ( 167) ACCEPTABLE Before observing releasing write to, any value is OK for ... |
shipilev
/ gist:9640309
Created
March 19, 2014 12:05
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| # Run progress: 0.00% complete, ETA 00:00:05 | |
| # VM invoker: /home/shade/Install/jdk8u0/jre/bin/java | |
| # VM options: <none> | |
| # Fork: 1 of 1 | |
| # Warmup: <none> | |
| # Measurement: 5 iterations, 1 s each | |
| # Threads: 1 thread, will synchronize iterations | |
| # Benchmark mode: Throughput, ops/time | |
| # Benchmark: org.openjdk.jmh.samples.JMHSample_01_HelloWorld.wellHelloThere | |
| Iteration 1: 1838576.986 ops/ms |
shipilev
/ gist:9595796
Created
March 17, 2014 08:33
Quad-core Cortex-A9, jcstress/UnfencedAcquireReleaseTest
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| $ jdk8b132/bin/java -server -XX:-RestrictContended -jar jcstress.jar -t ".*UnfencedAcquireReleaseTest.*" -v -f 0 -iters 1000 | |
| (ETA: n/a) (R: 5.82E+12) (T: 1/0) (F: 0/0) (I: 0/1000) [OK] o.o.j.t.fences.UnfencedAcquireReleaseTest | |
| Observed state Occurrences Expectation Interpretation | |
| [0, 0] ( 190,046,972) ACCEPTABLE Before observing releasing write to, any value is OK for ... | |
| [0, 1] ( 234) ACCEPTABLE Before observing releasing write to, any value is OK for ... | |
| [0, 2] ( 322) ACCEPTABLE Before observing releasing write to, any value is OK for ... | |
| [0, 3] ( 178,121) ACCEPTABLE Before observing releasing write to, any value is OK for ... | |
| [1, 0] ( 572) ACCEPTABLE_INTERESTING Without fence or volatile can read the default or old val... | |
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| package org.sample; | |
| import org.openjdk.jmh.annotations.BenchmarkMode; | |
| import org.openjdk.jmh.annotations.Fork; | |
| import org.openjdk.jmh.annotations.GenerateMicroBenchmark; | |
| import org.openjdk.jmh.annotations.Measurement; | |
| import org.openjdk.jmh.annotations.Mode; | |
| import org.openjdk.jmh.annotations.OutputTimeUnit; | |
| import org.openjdk.jmh.annotations.Param; | |
| import org.openjdk.jmh.annotations.Scope; |
shipilev
/ IterationBenchmark.java
Last active
August 29, 2015 13:57
Pop quiz: what's wrong with measureWrong()?
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| package org.sample; | |
| import org.openjdk.jmh.annotations.BenchmarkMode; | |
| import org.openjdk.jmh.annotations.Fork; | |
| import org.openjdk.jmh.annotations.GenerateMicroBenchmark; | |
| import org.openjdk.jmh.annotations.Measurement; | |
| import org.openjdk.jmh.annotations.Mode; | |
| import org.openjdk.jmh.annotations.OutputTimeUnit; | |
| import org.openjdk.jmh.annotations.Param; | |
| import org.openjdk.jmh.annotations.Scope; |
shipilev
/ gist:8964310
Created
February 12, 2014 20:55
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| Entering generation 0 | |
| --------------------------------------- | |
| Baseline score: 663.60 ops/ms | |
| 678.53 ops/ms ( +2.25%) -XX:FreqInlineSize=325 -XX:InlineSmallCode=1000 -XX:MaxInlineLevel=9 -XX:MaxInlineSize=35 -XX:MaxRecursiveInlineLevel=1 -XX:MinInliningThreshold=250 | |
| 676.79 ops/ms ( +1.99%) -XX:FreqInlineSize=325 -XX:InlineSmallCode=1000 -XX:MaxInlineLevel=9 -XX:MaxInlineSize=35 -XX:MaxRecursiveInlineLevel=1 -XX:MinInliningThreshold=250 | |
| 673.78 ops/ms ( +1.53%) -XX:FreqInlineSize=325 -XX:InlineSmallCode=1000 -XX:MaxInlineLevel=9 -XX:MaxInlineSize=35 -XX:MaxRecursiveInlineLevel=1 -XX:MinInliningThreshold=250 | |
| 673.55 ops/ms ( +1.50%) -XX:FreqInlineSize=325 -XX:InlineSmallCode=1000 -XX:MaxInlineLevel=9 -XX:MaxInlineSize=35 -XX:MaxRecursiveInlineLevel=1 -XX:MinInliningThreshold=250 | |
| 670.98 ops/ms ( +1.11%) -XX:FreqInlineSize=325 -XX:InlineSmallCode=1000 -XX:MaxInlineLevel=9 -XX:MaxInlineSize=35 -XX:MaxRecursiveInlineLevel=1 -XX:MinInliningThreshold=250 | |
| 670.82 ops/ms ( |
shipilev
/ gist:8470787
Last active
January 3, 2016 13:39
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| This is a class: | |
| class C { | |
| final int v; | |
| C(int v) { | |
| this.v = v; | |
| } | |
| int sqr() { | |
| return v*v; |
shipilev
/ gist:8038826
Last active
August 13, 2018 19:35
How to stop tweeting and investigate HotSpot
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| *** Figuring out what "no vm operation" means here in -XX:+PrintSafepointStatistics: | |
| vmop [threads: total initially_running wait_to_block] [time: spin block sync cleanup vmop] page_trap_count | |
| 0.320: Deoptimize [ 7 0 0 ] [ 0 0 0 0 0 ] 0 | |
| 1.320: no vm operation [ 8 1 1 ] [ 0 0 0 0 0 ] 1 | |
| 4.061: EnableBiasedLocking [ 8 1 1 ] [ 0 0 0 0 0 ] 1 | |
| 5.222: RevokeBias [ 8 0 1 ] [ 0 0 0 0 0 ] 0 | |
| 5.831: RevokeBias [ 8 0 0 ] [ 0 0 0 0 0 ] 0 | |
| 6.440: RevokeBias [ 8 0 0 ] [ 0 0 0 0 0 ] 0 | |
| 7.049: RevokeBias |