nitsanw’s gists

nitsanw / gist:4587751

Last active December 11, 2015 10:38

Ivy.xml to bring in Caliper

	<ivy-module version="2.0">
	<info organisation="psy.lob.saw" module="experiments"/>
	<dependencies>
	<dependency org="com.google.caliper" name="caliper" rev="0.5-rc1">
	<exclude name='java-allocation-instrumenter' />
	</dependency>
	</dependencies>
	</ivy-module>

nitsanw / gist:4587927

Last active December 11, 2015 10:38

Hand rolled benchmarking for UTF8 encoding

	import java.io.BufferedReader;
	import java.io.FileInputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.UnsupportedEncodingException;
	import java.nio.ByteBuffer;
	import java.nio.CharBuffer;
	import java.nio.charset.Charset;
	import java.nio.charset.CharsetEncoder;
	import java.nio.charset.CoderResult;

nitsanw / gist:4587995

Created January 21, 2013 18:07

Caliper benchmark of UTF8 string encoding

	package utf8;

	import java.io.BufferedReader;
	import java.io.FileInputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.UnsupportedEncodingException;
	import java.nio.ByteBuffer;
	import java.nio.CharBuffer;
	import java.nio.charset.Charset;

nitsanw / gist:4588102

Created January 21, 2013 18:23

Caliper output of UTF8 benchmark

	0% Scenario{vm=java, trial=0, benchmark=CustomEncoder, direct=true, stringsFile=utf8.txt} 107419.06 ns; σ=1032.57 ns @ 4 trials
	17% Scenario{vm=java, trial=0, benchmark=StringGetBytes, direct=true, stringsFile=utf8.txt} 199795.25 ns; σ=6067.76 ns @ 10 trials
	33% Scenario{vm=java, trial=0, benchmark=CharsetEncoder, direct=true, stringsFile=utf8.txt} 278708.17 ns; σ=10344.13 ns @ 10 trials
	50% Scenario{vm=java, trial=0, benchmark=CustomEncoder, direct=false, stringsFile=utf8.txt} 102597.54 ns; σ=3081.05 ns @ 10 trials
	67% Scenario{vm=java, trial=0, benchmark=StringGetBytes, direct=false, stringsFile=utf8.txt} 196083.46 ns; σ=4185.70 ns @ 10 trials
	83% Scenario{vm=java, trial=0, benchmark=CharsetEncoder, direct=false, stringsFile=utf8.txt} 185340.89 ns; σ=17881.00 ns @ 10 trials

	benchmark direct us linear runtime
	CustomEncoder true 107 ===========
	CustomEncoder false 103 ===========

nitsanw / gist:4589685

Last active December 11, 2015 10:48

Run a benchmark with measureMemory sorted

	<target name="benchmark-utf8-encoding" depends="build,download-allocation-jar" description=" run experiments">
	<ivy:cachepath pathid="lib.path.id" />
	<java classpathref="lib.path.id" classname="utf8.Utf8EncodingBenchmark" fork="true">
	<classpath>
	<pathelement path="${build.dir}"/>
	<pathelement location="${allocation.jar.file}"/>
	</classpath>
	<env key="ALLOCATION_JAR" value="${allocation.jar.file}"/>
	<arg value="--measureMemory" />
	</java>

nitsanw / gist:4589721

Created January 21, 2013 21:40

UTF8 benchmark output with allocation

	benchmark-utf8-encoding:
	[java] 0% Scenario{vm=java, trial=0, benchmark=CustomEncoder, direct=true, stringsFile=utf8.txt} 99842.67 ns; σ=741.65 ns @ 3 trials, allocated 0 instances for a total of 0B
	[java] 17% Scenario{vm=java, trial=0, benchmark=StringGetBytes, direct=true, stringsFile=utf8.txt} 204718.91 ns; σ=11685.98 ns @ 10 trials, allocated 2672 instances for a total of 166024B
	[java] 33% Scenario{vm=java, trial=0, benchmark=CharsetEncoder, direct=true, stringsFile=utf8.txt} 267964.76 ns; σ=2541.32 ns @ 3 trials, allocated 0 instances for a total of 0B
	[java] 50% Scenario{vm=java, trial=0, benchmark=CustomEncoder, direct=false, stringsFile=utf8.txt} 102537.55 ns; σ=5065.85 ns @ 10 trials, allocated 0 instances for a total of 0B
	[java] 67% Scenario{vm=java, trial=0, benchmark=StringGetBytes, direct=false, stringsFile=utf8.txt} 202675.42 ns; σ=6581.97 ns @ 10 trials, allocated 2672 instances for a total of 166024B
	[java] 83% Scenario{vm=java, trial=0, benchmark=CharsetEncode

nitsanw / gist:4758225

Last active December 12, 2015 10:19

Unaligned memory concurrent access atomicity test

	public class DirectByteBufferUnalignedInLineAtomicityTests {

	public abstract static class ByteBufferTest implements
	Actor1_Effector1_Test<ByteBuffer, long[]> {
	@Override
	public ByteBuffer newState() {
	return allocateNaughtyBuffer(getSize());
	}

	abstract int getSize();

nitsanw / gist:4758322

Last active December 12, 2015 10:18

Results for running atomicity test across cache lines

	$ java -jar target/java-concurrency-torture.jar -v -time 1000 -t .DirectByteBufferUnalignedCrossLineAtomicityTests.LongTest
	Java Concurrency Torture Tests
	---------------------------------------------------------------------------------
	Running in forked mode...

	Running each test for 1000ms
	Each test does 10 internal loops
	Look in results.html for the results

	Running org.openjdk.concurrent.torture.tests.atomicity.crosscache.DirectByteBufferUnalignedCrossLineAtomicityTests$LongTest

nitsanw / gist:4758402

Last active December 12, 2015 10:19

Concurrent unaligned memory access within the cache line

	Running org.openjdk.concurrent.torture.tests.atomicity.buffers.DirectByteBufferUnalignedInLineAtomicityTests$LongTest
	Executing with 2 threads x 2 groups = 4 threads
	Iterations .
	Observed state Occurrences Expectation Interpretation
	[0] ( 1327957) UNKNOWN N/A
	[-1] ( 1336273) UNKNOWN N/A

nitsanw / gist:4761109

Created February 12, 2013 09:10

Concurrent unaligned memory access fails

	Running org.openjdk.concurrent.torture.tests.atomicity.buffers.DirectByteBufferUnalignedInLineAtomicityTests$LongTest
	Executing with 2 threads x 2 groups = 4 threads
	Iterations .
	Observed state Occurrences Expectation Interpretation
	[-1] ( 2139678) UNKNOWN N/A
	[0] ( 2397091) UNKNOWN N/A
	[-4294967296] ( 1) UNKNOWN N/A
	.
	Observed state Occurrences Expectation Interpretation
	[-1] ( 4365283) UNKNOWN N/A

Nitsan Wakart nitsanw