test/loops/RLIBar.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 */
// Adapted from code that was in turn
// Derived from SocketPerformanceTest.java - BugID: 4763450
//
//

import java.io.*;
import java.net.*;
import java.util.concurrent.*;
import java.util.concurrent.locks.*;

public class RLIBar {

    static int batchLimit;
    static int mseq;
    static int nReady;
    static int ExThreads;
    static int ASum;
    static final ReentrantLock Gate = new ReentrantLock();
    static final Condition GateCond = Gate.newCondition();

    static final ReentrantLock HoldQ = new ReentrantLock();
    static final Condition HoldQCond = HoldQ.newCondition();
    static boolean Hold = false;
    static int HoldPop;
    static int HoldLimit;

    private static boolean HoldCheck() {
        try {
            HoldQ.lock();
            try {
                if (!Hold) return false;
                else {
                    ++HoldPop;
                    if (HoldPop >= HoldLimit) {
                        System.out.print("Holding ");
                        Thread.sleep(1000);
                        System.out.println();
                        Hold = false;
                        HoldQCond.signalAll();
                    }
                    else
                        while (Hold)
                            HoldQCond.await();

                    if (--HoldPop == 0) HoldQCond.signalAll();
                    return true;
                }
            }
            finally {
                HoldQ.unlock();
            }
        } catch (Exception Ex) {
            System.out.println("Unexpected exception in Hold: " + Ex);
            return false;
        }
    }

    private static class Server {
        private int nClients;
        final ReentrantLock thisLock = new ReentrantLock();
        final Condition thisCond = thisLock.newCondition();

        Server(int nClients) {
            this.nClients = nClients;
            try {
                for (int i = 0; i < nClients; ++i) {
                    final int fix = i;
                    new Thread() { public void run() { runServer(fix); }}.start();
                }
            } catch (Exception e) {
                System.err.println(e);
            }
        }

        // the total number of messages received by all server threads
        // on this server
        int msgsReceived = 0;

        // incremented each time we get a complete batch of requests
        private int currentBatch = 0;

        // the number of requests received since the last time currentBatch
        // was incremented
        private int currentBatchSize = 0;

        private void runServer(int id) {
            int msg;
            boolean held = false;
            final ReentrantLock thisLock = this.thisLock;
            final Condition thisCond = this.thisCond;

            try {

                // Startup barrier - rendezvous - wait for all threads.
                // Forces all threads to park on their LWPs, ensuring
                // proper provisioning on T1.
                // Alternately, use THR_BOUND threads
                Gate.lock(); try {
                    ++nReady;
                    if (nReady == ExThreads) {
                        GateCond.signalAll();
                    }
                    while (nReady != ExThreads)
                        GateCond.await();
                } finally { Gate.unlock(); }

                for (;;) {
                    //                    if (!held && currentBatchSize == 0) held = HoldCheck ();
                    msg = (++ mseq) ^ id;
                    thisLock.lock();
                    try {
                        ASum += msg;
                        ++msgsReceived;
                        int myBatch = currentBatch;
                        if (++currentBatchSize >= batchLimit) {
                            // this batch is full, start a new one ...
                            ++currentBatch;
                            currentBatchSize = 0;
                            // and wake up everyone in this one
                            thisCond.signalAll();
                        }
                        // Wait until our batch is complete
                        while (myBatch == currentBatch)
                            thisCond.await();
                    }
                    finally {
                        thisLock.unlock();
                    }
                }
            } catch (Exception e) {
                System.err.println("Server thread: exception "  + e);
                e.printStackTrace();
            }
        }


    }

    public static void main(String[] args) throws Exception {
        int nServers = 10;
        int nClients = 10;
        int samplePeriod = 10000;
        int nSamples = 5;

        int nextArg = 0;
        while (nextArg < args.length) {
            String arg = args[nextArg++];
            if (arg.equals("-nc"))
                nClients = Integer.parseInt(args[nextArg++]);
            else if (arg.equals("-ns"))
                nServers = Integer.parseInt(args[nextArg++]);
            else if (arg.equals("-batch"))
                batchLimit = Integer.parseInt(args[nextArg++]);
            else if (arg.equals("-sample"))
                samplePeriod = Integer.parseInt(args[nextArg++]);
            else if (arg.equals("-np"))
                nSamples = Integer.parseInt(args[nextArg++]);
            else {
                System.err.println("Argument error:" + arg);
                System.exit(1);
            }
        }
        if (nClients <= 0 || nServers <= 0 || samplePeriod <= 0 || batchLimit > nClients) {
            System.err.println("Argument error");
            System.exit(1);
        }

        // default batch size is 2/3 the number of clients
        // (for no particular reason)
        if (false && batchLimit <= 0)
            batchLimit = (2 * nClients + 1) / 3;

        ExThreads = nServers * nClients;       // expected # of threads
        HoldLimit = ExThreads;

        // start up all threads
        Server[] servers = new Server[nServers];
        for (int i = 0; i < nServers; ++i) {
            servers[i] = new Server(nClients);
        }

        // Wait for consensus
        try {
            Gate.lock(); try {
                while (nReady != ExThreads ) GateCond.await();
            } finally { Gate.unlock(); }
        } catch (Exception ex) {
            System.out.println(ex);
        }
        System.out.println(
                            nReady + " Ready: nc=" + nClients + " ns=" + nServers + " batch=" + batchLimit);

        // Start sampling ...
        // Methodological problem: all the mutator threads
        // can starve the compiler threads, resulting in skewed scores.
        // In theory, over time, the scores will improve as the compiler
        // threads are granted CPU cycles, but in practice a "warm up" phase
        // might be good idea to help C2.  For this reason I've implemented
        // the "Hold" facility.

        long lastNumMsgs = 0;
        long sampleStart = System.currentTimeMillis();
        for (int j = 0; j < nSamples; ++j) {
            // when this sample period is supposed to end
            long sampleEnd = sampleStart + samplePeriod;
            for (;;) {
                long now = System.currentTimeMillis();
                if (now >= sampleEnd) {
                    // when it really did end
                    sampleEnd = now;
                    break;
                }
                Thread.sleep(sampleEnd - now);
            }

            if (false && j == 2) {
                System.out.print("Hold activated ...");
                HoldQ.lock();
                try  {
                    Hold = true;
                    while (Hold) HoldQCond.await();
                }
                finally {
                    HoldQ.unlock();
                }
            }


            // there's no synchronization here, so the total i get is
            // approximate, but that's OK since any i miss for this
            // sample will get credited to the next sample, and on average
            // we'll be right
            long numMsgs = 0;
            for (int i = 0; i < nServers; ++i)
                numMsgs += servers[i].msgsReceived;
            long deltaMsgs = numMsgs - lastNumMsgs;
            long deltaT = sampleEnd - sampleStart;
            if (true || j != 2) {       // Don't report results if we issued a hold ...
                System.out.print(
                                 "Sample period = " + deltaT + " ms; "
                                 + "New msgs rcvd = " + deltaMsgs + "; "
                                 + "Throughput = " + (deltaMsgs*1000 / deltaT) + " msg/sec\n");
                //                for (int i = 0; i < nServers; ++i)
                //                    servers[i].thisLock.dump();
            }
            sampleStart = sampleEnd;
            lastNumMsgs = numMsgs;
        }
        System.exit(0);
    }
}
Revision:	1.6
Committed:	Mon Sep 27 19:15:15 2010 UTC (13 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+1 -1 lines
Log Message:	use blessed declaration modifier order
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/licenses/publicdomain
5	*/
6	// Adapted from code that was in turn
7	// Derived from SocketPerformanceTest.java - BugID: 4763450
8	//
9	//
10
11	import java.io.*;
12	import java.net.*;
13	import java.util.concurrent.*;
14	import java.util.concurrent.locks.*;
15
16	public class RLIBar {
17
18	static int batchLimit;
19	static int mseq;
20	static int nReady;
21	static int ExThreads;
22	static int ASum;
23	static final ReentrantLock Gate = new ReentrantLock();
24	static final Condition GateCond = Gate.newCondition();
25
26	static final ReentrantLock HoldQ = new ReentrantLock();
27	static final Condition HoldQCond = HoldQ.newCondition();
28	static boolean Hold = false;
29	static int HoldPop;
30	static int HoldLimit;
31
32	private static boolean HoldCheck() {
33	try {
34	HoldQ.lock();
35	try {
36	if (!Hold) return false;
37	else {
38	++HoldPop;
39	if (HoldPop >= HoldLimit) {
40	System.out.print("Holding ");
41	Thread.sleep(1000);
42	System.out.println();
43	Hold = false;
44	HoldQCond.signalAll();
45	}
46	else
47	while (Hold)
48	HoldQCond.await();
49
50	if (--HoldPop == 0) HoldQCond.signalAll();
51	return true;
52	}
53	}
54	finally {
55	HoldQ.unlock();
56	}
57	} catch (Exception Ex) {
58	System.out.println("Unexpected exception in Hold: " + Ex);
59	return false;
60	}
61	}
62
63	private static class Server {
64	private int nClients;
65	final ReentrantLock thisLock = new ReentrantLock();
66	final Condition thisCond = thisLock.newCondition();
67
68	Server(int nClients) {
69	this.nClients = nClients;
70	try {
71	for (int i = 0; i < nClients; ++i) {
72	final int fix = i;
73	new Thread() { public void run() { runServer(fix); }}.start();
74	}
75	} catch (Exception e) {
76	System.err.println(e);
77	}
78	}
79
80	// the total number of messages received by all server threads
81	// on this server
82	int msgsReceived = 0;
83
84	// incremented each time we get a complete batch of requests
85	private int currentBatch = 0;
86
87	// the number of requests received since the last time currentBatch
88	// was incremented
89	private int currentBatchSize = 0;
90
91	private void runServer(int id) {
92	int msg;
93	boolean held = false;
94	final ReentrantLock thisLock = this.thisLock;
95	final Condition thisCond = this.thisCond;
96
97	try {
98
99	// Startup barrier - rendezvous - wait for all threads.
100	// Forces all threads to park on their LWPs, ensuring
101	// proper provisioning on T1.
102	// Alternately, use THR_BOUND threads
103	Gate.lock(); try {
104	++nReady;
105	if (nReady == ExThreads) {
106	GateCond.signalAll();
107	}
108	while (nReady != ExThreads)
109	GateCond.await();
110	} finally { Gate.unlock(); }
111
112	for (;;) {
113	// if (!held && currentBatchSize == 0) held = HoldCheck ();
114	msg = (++ mseq) ^ id;
115	thisLock.lock();
116	try {
117	ASum += msg;
118	++msgsReceived;
119	int myBatch = currentBatch;
120	if (++currentBatchSize >= batchLimit) {
121	// this batch is full, start a new one ...
122	++currentBatch;
123	currentBatchSize = 0;
124	// and wake up everyone in this one
125	thisCond.signalAll();
126	}
127	// Wait until our batch is complete
128	while (myBatch == currentBatch)
129	thisCond.await();
130	}
131	finally {
132	thisLock.unlock();
133	}
134	}
135	} catch (Exception e) {
136	System.err.println("Server thread: exception " + e);
137	e.printStackTrace();
138	}
139	}
140
141
142	}
143
144	public static void main(String[] args) throws Exception {
145	int nServers = 10;
146	int nClients = 10;
147	int samplePeriod = 10000;
148	int nSamples = 5;
149
150	int nextArg = 0;
151	while (nextArg < args.length) {
152	String arg = args[nextArg++];
153	if (arg.equals("-nc"))
154	nClients = Integer.parseInt(args[nextArg++]);
155	else if (arg.equals("-ns"))
156	nServers = Integer.parseInt(args[nextArg++]);
157	else if (arg.equals("-batch"))
158	batchLimit = Integer.parseInt(args[nextArg++]);
159	else if (arg.equals("-sample"))
160	samplePeriod = Integer.parseInt(args[nextArg++]);
161	else if (arg.equals("-np"))
162	nSamples = Integer.parseInt(args[nextArg++]);
163	else {
164	System.err.println("Argument error:" + arg);
165	System.exit(1);
166	}
167	}
168	if (nClients <= 0 \|\| nServers <= 0 \|\| samplePeriod <= 0 \|\| batchLimit > nClients) {
169	System.err.println("Argument error");
170	System.exit(1);
171	}
172
173	// default batch size is 2/3 the number of clients
174	// (for no particular reason)
175	if (false && batchLimit <= 0)
176	batchLimit = (2 * nClients + 1) / 3;
177
178	ExThreads = nServers * nClients; // expected # of threads
179	HoldLimit = ExThreads;
180
181	// start up all threads
182	Server[] servers = new Server[nServers];
183	for (int i = 0; i < nServers; ++i) {
184	servers[i] = new Server(nClients);
185	}
186
187	// Wait for consensus
188	try {
189	Gate.lock(); try {
190	while (nReady != ExThreads ) GateCond.await();
191	} finally { Gate.unlock(); }
192	} catch (Exception ex) {
193	System.out.println(ex);
194	}
195	System.out.println(
196	nReady + " Ready: nc=" + nClients + " ns=" + nServers + " batch=" + batchLimit);
197
198	// Start sampling ...
199	// Methodological problem: all the mutator threads
200	// can starve the compiler threads, resulting in skewed scores.
201	// In theory, over time, the scores will improve as the compiler
202	// threads are granted CPU cycles, but in practice a "warm up" phase
203	// might be good idea to help C2. For this reason I've implemented
204	// the "Hold" facility.
205
206	long lastNumMsgs = 0;
207	long sampleStart = System.currentTimeMillis();
208	for (int j = 0; j < nSamples; ++j) {
209	// when this sample period is supposed to end
210	long sampleEnd = sampleStart + samplePeriod;
211	for (;;) {
212	long now = System.currentTimeMillis();
213	if (now >= sampleEnd) {
214	// when it really did end
215	sampleEnd = now;
216	break;
217	}
218	Thread.sleep(sampleEnd - now);
219	}
220
221	if (false && j == 2) {
222	System.out.print("Hold activated ...");
223	HoldQ.lock();
224	try {
225	Hold = true;
226	while (Hold) HoldQCond.await();
227	}
228	finally {
229	HoldQ.unlock();
230	}
231	}
232
233
234
235	// there's no synchronization here, so the total i get is
236	// approximate, but that's OK since any i miss for this
237	// sample will get credited to the next sample, and on average
238	// we'll be right
239	long numMsgs = 0;
240	for (int i = 0; i < nServers; ++i)
241	numMsgs += servers[i].msgsReceived;
242	long deltaMsgs = numMsgs - lastNumMsgs;
243	long deltaT = sampleEnd - sampleStart;
244	if (true \|\| j != 2) { // Don't report results if we issued a hold ...
245	System.out.print(
246	"Sample period = " + deltaT + " ms; "
247	+ "New msgs rcvd = " + deltaMsgs + "; "
248	+ "Throughput = " + (deltaMsgs*1000 / deltaT) + " msg/sec\n");
249	// for (int i = 0; i < nServers; ++i)
250	// servers[i].thisLock.dump();
251	}
252	sampleStart = sampleEnd;
253	lastNumMsgs = numMsgs;
254	}
255	System.exit(0);
256	}
257	}