Added Example Code (8971339c) · Commits · examples / Using Linux Performance Tools

examples/Chapter 1/No Work Files.rtf

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Changes for examples/Chapter 1/No Work Files.rtf: 7 added lines, 0 removed lines.
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		{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350
		{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
		{\colortbl;\red255\green255\blue255;}
		\margl1440\margr1440\vieww9000\viewh8400\viewkind0
		\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

		\f0\fs24 \cf0 No work files for this lesson...}
		No newline at end of file

examples/Chapter 2/buggy/Allocy.java

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Changes for examples/Chapter 2/buggy/Allocy.java: 27 added lines, 0 removed lines.
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		class ResponseBuilder {
		private String response;

		public ResponseBuilder(String template) {
		response = template;
		}

		public void addLine(String line) {
		response += line;
		}

		public String getResponse() {
		return response;
		}
		}

		class Allocy {
		public static void main(String[] args) {
		while (true) {
		ResponseBuilder rb = new ResponseBuilder("Result:");
		for (int i = 0; i < 100000; ++i) {
		rb.addLine("#" + i + ": OK");
		}
		rb.addLine("End of response.");
		}
		}
		}

examples/Chapter 2/buggy/Collecty.java

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Changes for examples/Chapter 2/buggy/Collecty.java: 37 added lines, 0 removed lines.
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		class DataFetcher {
		public void fetchData(String datum, int index) {
		if (index == 0 \|\| index % 37 != 0) {
		processIt();
		return;
		}
		System.out.println("Error fetching data, cleaning up.");
		System.gc();
		}

		private void processIt() {
		}
		}

		class RequestProcessor {
		private DataFetcher fetcher;

		public RequestProcessor() {
		fetcher = new DataFetcher();
		}

		public void processRequest(String url, int index) throws Exception {
		if (index != 0 && index % 43 == 0)
		fetcher.fetchData(url, index);
		else
		Thread.sleep(1);
		}
		}

		class Collecty {
		public static void main(String[] args) throws Exception {
		RequestProcessor rp = new RequestProcessor();
		for (int i = 0; ; ++i) {
		rp.processRequest("/api/all", i);
		}
		}
		}

examples/Chapter 2/buggy/Computey.java

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Changes for examples/Chapter 2/buggy/Computey.java: 70 added lines, 0 removed lines.
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		import java.util.ArrayList;

		class Primes {
		private final int from;
		private final int to;
		private final int numThreads;
		private ArrayList<Integer> primes = new ArrayList<>();
		private Object primesLock = new Object();

		public Primes(int from, int to, int numThreads) {
		this.from = from;
		this.to = to;
		this.numThreads = numThreads;
		}

		public int count() {
		return primes.size();
		}

		public void execute() throws Exception {
		Thread[] threads = new Thread[numThreads];
		int chunkSize = (to-from)/numThreads;
		for (int i = 0; i < numThreads; ++i) {
		final int myStart = i*chunkSize;
		final int myEnd = (i+1)*chunkSize - 1;
		threads[i] = new Thread(new Runnable() {
		public void run() {
		primesThread(myStart, myEnd);
		}
		});
		threads[i].start();
		}
		for (Thread thread : threads) {
		thread.join();
		}
		}

		private void primesThread(int from, int to) {
		for (int i = from; i <= to; ++i) {
		if (isPrime(i)) {
		synchronized (primesLock) {
		primes.add(i);
		}
		}
		}
		}

		private static boolean isPrime(int number) {
		// Obviously very inefficient
		if (number == 2) return true;
		if (number % 2 == 0) return false;
		for (int i = 3; i < number; i += 2)
		if (number % i == 0)
		return false;
		return true;
		}
		}

		class Computey {
		public static void main(String[] args) throws Exception {
		int from = Integer.parseInt(args[0]);
		int to = Integer.parseInt(args[1]);
		int numThreads = Integer.parseInt(args[2]);
		Primes primes = new Primes(from, to, numThreads);
		System.out.println("Press RETURN to start.");
		System.in.read();
		primes.execute();
		System.out.println("Found " + primes.count() + " primes");
		}
		}

examples/Chapter 2/buggy/Makefile

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Changes for examples/Chapter 2/buggy/Makefile: 50 added lines, 0 removed lines.
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		JAVAFLAGS=-XX:+PreserveFramePointer -Xcomp
		JAVAEXTFLAGS=-XX:+ExtendedDTraceProbes

		build:
		mkdir -p bin
		cp mysql-connector-java-5.1.40-bin.jar bin/
		javac *.java -d bin

		clean:
		rm -rf bin

		allocy: build
		java $(JAVAFLAGS) -cp bin Allocy

		allocyext: build
		java $(JAVAFLAGS) $(JAVAEXTFLAGS) -cp bin Allocy

		clientygood: build
		sudo pip install dnslib
		sudo ./proxy.py > /dev/null &
		java $(JAVAFLAGS) -cp bin Clienty good

		clientybad: build
		sudo pip install dnslib
		sudo ./proxy.py > /dev/null &
		java $(JAVAFLAGS) -cp bin Clienty bad

		collecty: build
		java $(JAVAFLAGS) $(JAVAEXTFLAGS) -cp bin Collecty

		computey: build
		java $(JAVAFLAGS) -cp bin Computey 2 4000000 4

		computeyext: build
		java $(JAVAFLAGS) $(JAVAEXTFLAGS) -cp bin Computey 2 4000000 4

		databasey: build
		java $(JAVAFLAGS) -cp "bin:bin/mysql-connector-java-5.1.40-bin.jar" \
		Databasey
		databaseyext: build
		java $(JAVAFLAGS) $(JAVAEXTFLAGS) \
		-cp "bin:bin/mysql-connector-java-5.1.40-bin.jar" Databasey

		servery: build
		java $(JAVAFLAGS) -cp bin Servery

		writey: build
		java $(JAVAFLAGS) -cp bin Writey

		all: build