Chris Vest chrisvest
🍉
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| package repl; | |
| import jdk.nashorn.internal.runtime.ParserException; | |
| import jnr.ffi.LibraryLoader; | |
| import java.io.BufferedReader; | |
| import java.io.IOException; | |
| import java.io.InputStreamReader; | |
| import java.io.PrintWriter; | |
| import java.nio.file.Files; |
chrisvest
/ pagelock.c
Created
May 12, 2015 17:21
This program uses memory in page units. As much as you like. Have fun.
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| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <unistd.h> | |
| #include <sys/stat.h> | |
| #include <fcntl.h> | |
| #include <sys/types.h> | |
| #include <sys/mman.h> | |
| void err(char** argv) { | |
| printf("Usage: %s <page count>\n", argv[0]); |
chrisvest
/ perf-stats.txt
Created
March 10, 2015 09:14
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| Perf stats for release : BinaryLatch # CountDownLatch(1) | |
| ----------------------------------------------------------------------------------------------------------------- | |
| task-clock (msec) : 37386,009560 ~ 0,928 # 98597,132785 ~ 2,449 CPUs utilized | |
| context-switches : 380.403 ~ 0,010 # 20.918.164 ~ 0,212 M/sec | |
| cpu-migrations : 69 ~ 0,002 # 5.269.662 ~ 0,053 M/sec | |
| page-faults : 3.990 ~ 0,107 # 3.977 ~ 0,040 K/sec | |
| cycles : 147.525.086.934 ~ 3,946 # 344.168.284.382 ~ 3,491 GHz | |
| stalled-cycles-frontend : 0 ~ 0,00% # 0 ~ 0,00% frontend cycles idle | |
| stalled-cycles-backend : 0 ~ 0,00% # 0 ~ 0,00% backend cycles idle | |
| instructions : 80.495.832.415 ~ |
chrisvest
/ BinaryLatch.java
Created
March 8, 2015 19:57
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| /* | |
| * Written by Chris Vest and released to the public domain, as explained at | |
| * http://creativecommons.org/publicdomain/zero/1.0/ | |
| */ | |
| package binarylatch; | |
| import java.util.concurrent.atomic.AtomicReference; | |
| import java.util.concurrent.locks.LockSupport; | |
| /** |
chrisvest
/ java8-using-cms-gc.txt
Last active
August 29, 2015 14:15
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| nitsan:object-pool-benchmarks% java -jar target/benchmarks.jar 'Simulation.(newObject|claimReleaseWithout)' -bm sample -i 10 -wi 10 -tu ns -t 1 -f 1 -r 10 -jvmArgsPrepend '-XX:+UseConcMarkSweepGC' | |
| # JMH 1.5.1 (released 10 days ago) | |
| # VM invoker: /usr/lib/jvm/java-8-jdk/jre/bin/java | |
| # VM options: -XX:+UseConcMarkSweepGC | |
| # Warmup: 10 iterations, 1 s each | |
| # Measurement: 10 iterations, 10 s each | |
| # Timeout: 10 min per iteration | |
| # Threads: 1 thread, will synchronize iterations | |
| # Benchmark mode: Sampling time | |
| # Benchmark: objectpoolbenchmark.specific.stormpot.Simulation.claimReleaseWithoutReturn |
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| [49m [38;5;0m▄▄[38;5;239;48;5;0m▄▄[38;5;237m▄▄[38;5;0;49m▄▄▄ [0m | |
| [38;5;0m▄[38;5;239;48;5;0m▄[48;5;239m [38;5;237m▄▄[48;5;237m [48;5;0m▄▄[38;5;0;49m▄ [0m | |
| [48;5;0m [38;5;237;48;5;239m▄[38;5;239;48;5;243m▄▄[38;5;243;48;5;239m▄[48;5;237m▄▄ [38;5;239m▄▄ [48;5;234m [48;5;0m [49m [0m | |
| [38;5;0m▄[38;5;237;48;5;0m▄[48;5;237m [38;5;234m▄ [38;5;237;48;5;239m▄▄▄[48;5;234m [38;5;234;48;5;237m▄▄ [48;5;237m▄[48;5;234m [48;5;237m▄[38;5;237;48;5;0m▄[49m▄▄▄ [0m | |
| [48;5;0m [48;5;237m [38;5;0m▄[48;5;234m [38;5;234;48;5;237m▄ [48;5;167m [38;5;167;48;5;234m▄ [38;5;234;48;5;237m▄[38;5;0;48;5;234m▄▄[49m |
chrisvest
/ MemoryHolder.java
Created
December 1, 2014 08:23
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| public static void main(String[] args) { | |
| MemoryHolder holder = new MemoryHolder(); | |
| System.out.println("holder.getInt() = " + holder.getInt()); | |
| reachabilityFence(holder); | |
| } |
chrisvest
/ MemoryHolder.java
Created
December 1, 2014 08:18
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| public static void main(String[] args) { | |
| MemoryHolder holder = new MemoryHolder(); | |
| long p = holder.pointer; // last use of 'holder' | |
| int n = unsafe.getInt(null, p); | |
| System.out.println("holder.getInt() = " + n); | |
| } |
chrisvest
/ MemoryHolder.java
Last active
August 29, 2015 14:10
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| public class MemoryHolder { | |
| private long pointer; | |
| public MemoryHolder() { | |
| pointer = unsafe.allocateMemory(MEMORY); | |
| } | |
| @Override | |
| protected void finalize() { | |
| unsafe.freeMemory(pointer); |
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| import org.openjdk.jmh.annotations.Benchmark; | |
| import org.openjdk.jmh.annotations.Fork; | |
| import org.openjdk.jmh.annotations.Measurement; | |
| import org.openjdk.jmh.annotations.OutputTimeUnit; | |
| import org.openjdk.jmh.annotations.Scope; | |
| import org.openjdk.jmh.annotations.Setup; | |
| import org.openjdk.jmh.annotations.State; | |
| import org.openjdk.jmh.annotations.Threads; | |
| import org.openjdk.jmh.annotations.Warmup; | |
| import sun.misc.Unsafe; |