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@nobeh nobeh/Killer.java
Last active Sep 7, 2015

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Trigger Unix OOM Killer
#!/bin/bash
sudo swapoff -a
sudo rm /swapfile
sudo dd if=/dev/zero of=/swapfile bs=1024 count=$1
sudo mkswap /swapfile
sudo swapon /swapfile
free -h -m
public class Killer {
static final long T0 = System.nanoTime();
static final java.util.Random R = new java.util.Random(System.nanoTime());
static java.util.logging.Logger LOGGER;
static String ID;
static class Data { // 8 bytes header
long p1; // 8 bytes
int p2; // 4 bytes
// 4 bytes padding
}
static class KillerArrays {
KillerArrays() {
int dataSize = 8 + 8 + 4 + 4;
long maxMemory = 993L * 1000L * 1000L; // the machine memory
long myMaxMemory = maxMemory / 5; // the memory for this process. Experiment with 5 processes.
int objectArraySize = (int) ((myMaxMemory / dataSize));
java.util.List<Data[]> l = new java.util.ArrayList<>();
for (int i = 1; l.size() < myMaxMemory; i++) {
try {
l.add(new Data[objectArraySize]);
} catch (Throwable t) {
log("*** ERROR *** %s", t);
System.exit(1);
} finally {
log("free / max / total : %s / %s / %s",
(Runtime.getRuntime().freeMemory() / 1000),
(Runtime.getRuntime().maxMemory() / 1000),
(Runtime.getRuntime().totalMemory()/ 1000)
);
}
}
}
}
static long now() {
return System.nanoTime();
}
static long elapsed() {
return now() - T0;
}
static void log(String format, Object... args) {
String msg = String.format("[%s] [%8s] %s", ID, (elapsed() / 1000_000), String.format(format, args));
LOGGER.log(java.util.logging.Level.INFO, msg);
}
public static void main(String[] args) throws Exception {
// Set j.u.logging format: [LEVEL] MSG [THROWABLE]
System.setProperty("java.util.logging.SimpleFormatter.format", "[%4$s] %5$s%n%6$s");
ID = args.length == 0 || args[0] == null ? "0" : args[0];
java.util.logging.FileHandler fh = new java.util.logging.FileHandler(String.format("./log-%s.log", ID), false);
fh.setFormatter(new java.util.logging.SimpleFormatter());
LOGGER = java.util.logging.Logger.getLogger("Killer");
LOGGER.addHandler(fh);
LOGGER.setUseParentHandlers(false);
new KillerArrays();
}
}
#!/bin/bash
java -XX:+IgnoreUnrecognizedVMOptions -XX:+CMSClassUnloadingEnabled \
-XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC \
-XX:+UseBiasedLocking -XX:+DoEscapeAnalysis -XX:+EliminateLocks \
-XX:-TieredCompilation -XX:+UseCompressedOops -XX:+UseXmmI2D \
-XX:+UseXmmI2F -XX:+UseXMMForArrayCopy -XX:+UseUnalignedLoadStores \
-XX:+PrintVMOptions -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions \
-XX:-UseIncDec -XX:+PrintClassHistogram -XX:+PrintGCDetails \
-XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+PrintConcurrentLocks \
-XX:+OptimizeStringConcat -XX:-UsePopCountInstruction -XX:+UseLargePages \
-XX:MaxGCPauseMillis=1 -Xmx900m -XX:MaxPermSize=2m \
-Xloggc:./app.gc.log \
Killer
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