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Java Source Code / Java Documentation » IDE Netbeans » cvsclient » org.netbeans.lib.profiler.server 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         * The Original Software is NetBeans. The Initial Developer of the Original
026:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
027:         * Microsystems, Inc. All Rights Reserved.
028:         *
029:         * If you wish your version of this file to be governed by only the CDDL
030:         * or only the GPL Version 2, indicate your decision by adding
031:         * "[Contributor] elects to include this software in this distribution
032:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
033:         * single choice of license, a recipient has the option to distribute
034:         * your version of this file under either the CDDL, the GPL Version 2 or
035:         * to extend the choice of license to its licensees as provided above.
036:         * However, if you add GPL Version 2 code and therefore, elected the GPL
037:         * Version 2 license, then the option applies only if the new code is
038:         * made subject to such option by the copyright holder.
039:         */
040:
041:        package org.netbeans.lib.profiler.server;
042:
043:        import org.netbeans.lib.profiler.server.system.Threads;
044:        import org.netbeans.lib.profiler.server.system.Timers;
045:
046:        /**
047:         * This class contains the actual methods for sampled instrumentation recursive CPU profiling, calls to which are injected
048:         * into the target application (TA) bytecodes when they are instrumented.
049:         *
050:         * methodEntry: if taking timestamp (in new sampling slot), time is charged to method being left
051:         * methodExit: if taking timestamp (in new sampling slot), time is charged to method being exited
052:         *
053:         * @author Tomas Hurka
054:         * @author Misha Dmitriev
055:         */
056:        public class ProfilerRuntimeCPUSampledInstr extends ProfilerRuntimeCPU {
057:            //~ Inner Classes ------------------------------------------------------------------------------------------------------------
058:
059:            //------------------------------------------- Support classes --------------------------------------------------
060:
061:            /** A thread that periodically sets the sample flag for worker threads */
062:            static class SamplingThread extends Thread {
063:                //~ Static fields/initializers -------------------------------------------------------------------------------------------
064:
065:                private static final boolean isSolaris = System.getProperty(
066:                        "os.name").startsWith("Sun"); // NOI18N
067:                private static final boolean isLinux = System.getProperty(
068:                        "os.name").startsWith("Linux"); // NOI18N
069:                private static final boolean isUnix = isSolaris || isLinux;
070:                private static final int VIOLATION_THRESHOLD = 10;
071:                private static final boolean DEBUG = false;
072:
073:                //~ Instance fields ------------------------------------------------------------------------------------------------------
074:
075:                private boolean terminated;
076:                private int count;
077:
078:                //~ Methods --------------------------------------------------------------------------------------------------------------
079:
080:                public void run() {
081:                    if (isSolaris) {
082:                        samplingInterval *= 1000000; // Convert into nanos - the Solaris hires timer resolution
083:                    } else if (isLinux) {
084:                        samplingInterval *= 1000; // Convert into microseconds - the Linux hires timer resolution
085:                    }
086:
087:                    int adjustedSamplingInterval = samplingInterval;
088:                    int upperBound = (samplingInterval * 5) / 4;
089:                    int lowerBound = samplingInterval / 10;
090:                    int violationCount = VIOLATION_THRESHOLD;
091:
092:                    long startTime = Timers.getCurrentTimeInCounts();
093:
094:                    while (!terminated) {
095:                        if (!isUnix) {
096:                            try {
097:                                Thread.sleep(samplingInterval);
098:                            } catch (InterruptedException ex) { /* Should not happen */
099:                            }
100:                        } else { // Solaris and Linux
101:
102:                            long time = Timers.getCurrentTimeInCounts();
103:                            // On Solaris, the resolution of Thread.sleep(), which boils down to the select(3C) system call, seems to be
104:                            // around 20 ms. So we have to use our own call, which eventually calls nanosleep() and takes an argument in nanos.
105:                            // On Linux (at least version 7.3 + patches, which I tried), nanosleep() seems to have a 20 ms resolution (or even
106:                            // give 20 ms no matter what?), which is a documented bug (see 'man nanosleep'). Well, maybe it improves in future...
107:                            Timers.osSleep(adjustedSamplingInterval);
108:                            time = Timers.getCurrentTimeInCounts() - time;
109:
110:                            if ((time > upperBound)
111:                                    && (adjustedSamplingInterval > lowerBound)) {
112:                                if (violationCount > 0) {
113:                                    violationCount--;
114:                                } else {
115:                                    adjustedSamplingInterval = (adjustedSamplingInterval * 95) / 100;
116:                                    violationCount = VIOLATION_THRESHOLD;
117:                                }
118:                            }
119:                        }
120:
121:                        ThreadInfo.setSampleDueForAllThreads();
122:
123:                        if (DEBUG) {
124:                            count++;
125:                        }
126:                    }
127:
128:                    if (DEBUG && isUnix) {
129:                        long time = ((Timers.getCurrentTimeInCounts() - startTime) * 1000)
130:                                / Timers.getNoOfCountsInSecond();
131:                        System.out
132:                                .println("JFluid sampling thread: elapsed time: "
133:                                        + time
134:                                        + " ms, avg interval: "
135:                                        + (((double) time) / count)
136:                                        + "ms, adjusted interval: "
137:                                        + adjustedSamplingInterval
138:                                        + " OS units"); // NOI18N
139:                    }
140:                }
141:
142:                public void terminate() {
143:                    terminated = true;
144:
145:                    try {
146:                        Thread.sleep(100);
147:                    } catch (InterruptedException ex) { /* Should not happen */
148:                    }
149:                }
150:            }
151:
152:            //~ Static fields/initializers -----------------------------------------------------------------------------------------------
153:
154:            protected static int samplingInterval = 10;
155:            protected static SamplingThread st;
156:
157:            //~ Methods ------------------------------------------------------------------------------------------------------------------
158:
159:            public static void setSamplingInterval(int v) {
160:                samplingInterval = v;
161:            }
162:
163:            public static void enableProfiling(boolean v) {
164:                if (v) {
165:                    createNewDataStructures();
166:                    ProfilerRuntimeCPU.enableProfiling(v);
167:                } else {
168:                    ProfilerRuntimeCPU.enableProfiling(v);
169:                    clearDataStructures();
170:                }
171:            }
172:
173:            // ---------------------------------- Profile Data Acquisition --------------------------------------
174:            /** Called upon entry into a special root method used for */
175:            public static void markerMethodEntry(char methodId) {
176:                if (recursiveInstrumentationDisabled) {
177:                    return; // See the comment at the recursiveInstrumentationDisabled variable declaration
178:                }
179:
180:                ThreadInfo ti = ThreadInfo.getThreadInfo();
181:
182:                if (ti.inProfilingRuntimeMethod > 0) {
183:                    return;
184:                }
185:
186:                //if (instrMethodClasses != null && methodId < instrMethodClasses.length) System.out.println("++++++Marker methodEntry for " + instrMethodClasses[methodId] + "." + instrMethodNames[methodId] + ", thread = " + Thread.currentThread());
187:                //else System.out.println("++++++Marker methodEntry for methodId = " + (int)methodId + ", thread = " + Thread.currentThread());
188:                if (!ti.isInitialized()) {
189:                    if ((nProfiledThreadsAllowed > 0)
190:                            && !ThreadInfo
191:                                    .isCurrentThreadProfilerServerThread()) {
192:                        ti.initialize();
193:                        ti.useEventBuffer();
194:
195:                        synchronized (eventBuffer) { // Make this happen atomically wrt. other operations on eventBuffer, such as reset collectors
196:                            nProfiledThreadsAllowed--;
197:                            ti.inProfilingRuntimeMethod++;
198:                            ti.inCallGraph = true;
199:                            writeThreadCreationEvent(ti);
200:                        }
201:                    } else {
202:                        return;
203:                    }
204:                } else {
205:                    ti.inProfilingRuntimeMethod++;
206:                    ti.inCallGraph = true;
207:                }
208:
209:                // This is to bypass what seems to be a compiler bug (at least C1 on Windows): when methodId > 64K/2 is passed here
210:                // using our instrumentation's sipush command at the call site, it's treated here as a signed integer. Thus without
211:                // the below fix we can get e.g. an ArrayIndexOutOfBoundsException(-32768) when methodId == 32768 (***)
212:                methodId = (char) ((int) methodId);
213:
214:                // DO NOT perform instrumentation of its immediate callees
215:                if (!instrMethodInvoked[methodId]) {
216:                    instrMethodInvoked[methodId] = true;
217:                }
218:
219:                ti.stackDepth++; //= 1;  // This is the logical stack depth
220:
221:                if (ti.stackDepth > 1) {
222:                    if (!ti.sampleDue) {
223:                        writeUnstampedEvent(MARKER_ENTRY_UNSTAMPED, ti,
224:                                methodId);
225:                    } else {
226:                        writeTimeStampedEvent(MARKER_ENTRY, ti, methodId);
227:                        ti.sampleDue = false;
228:                    }
229:                } else {
230:                    writeTimeStampedEvent(MARKER_ENTRY, ti, methodId);
231:                }
232:
233:                ti.inProfilingRuntimeMethod--;
234:            }
235:
236:            /** Called upon exit from the marker method. */
237:            public static void markerMethodExit(char methodId) {
238:                if (recursiveInstrumentationDisabled) {
239:                    return;
240:                }
241:
242:                ThreadInfo ti = ThreadInfo.getThreadInfo();
243:
244:                if (ti.isInitialized() && ti.inCallGraph) { // ti == null may happen if instrumentation has been removed or data collectors reset
245:
246:                    if (ti.inProfilingRuntimeMethod > 0) {
247:                        return;
248:                    }
249:
250:                    if (ti.rootMethodStackDepth > 0) {
251:                        methodExit(methodId);
252:                    } else {
253:                        ti.inProfilingRuntimeMethod++;
254:
255:                        //System.out.println("------markerMethodExit for " + instrMethodClasses[methodId] + "." + instrMethodNames[methodId] + ", depth = " + ti.stackDepth + ", id = " + (int) methodId);
256:                        ti.stackDepth--;
257:
258:                        if (ti.stackDepth < 1) {
259:                            ti.inCallGraph = false; // We are exiting the marker method of our call subgraph
260:                            writeTimeStampedEvent(MARKER_EXIT, ti, methodId);
261:                        } else {
262:                            if (!ti.sampleDue) {
263:                                writeUnstampedEvent(MARKER_EXIT_UNSTAMPED, ti,
264:                                        methodId);
265:                            } else {
266:                                writeTimeStampedEvent(MARKER_EXIT, ti, methodId);
267:                                ti.sampleDue = false;
268:                            }
269:                        }
270:
271:                        ti.inProfilingRuntimeMethod--;
272:                    }
273:                }
274:            }
275:
276:            /** Called upon entry into a non-root target application method */
277:            public static void methodEntry(char methodId) {
278:                if (recursiveInstrumentationDisabled) {
279:                    return; // See the comment at the recursiveInstrumentationDisabled variable declaration
280:                }
281:
282:                ThreadInfo ti = ThreadInfo.getThreadInfo();
283:
284:                if (ti.isInitialized() && ti.inCallGraph
285:                        && (ti.rootMethodStackDepth > 0)) {
286:                    if (ti.inProfilingRuntimeMethod > 0) {
287:                        return;
288:                    }
289:
290:                    ti.inProfilingRuntimeMethod++;
291:                    //System.out.println("++++++methodEntry, depth = " + ti.stackDepth + ", id = " + (int) methodId);
292:
293:                    // See comment marked with (***)
294:                    methodId = (char) ((int) methodId);
295:
296:                    // Now check if it's the first invocation of this method, and if so, perform instrumentation of nearest callees
297:                    if (!instrMethodInvoked[methodId]) {
298:                        long absTimeStamp = Timers.getCurrentTimeInCounts();
299:                        long threadTimeStamp = Timers.getThreadCPUTimeInNanos();
300:                        externalActionsHandler
301:                                .handleFirstTimeMethodInvoke(methodId);
302:                        instrMethodInvoked[methodId] = true; // Mark this method as invoked
303:                        writeAdjustTimeEvent(ti, absTimeStamp, threadTimeStamp);
304:                    }
305:
306:                    ti.stackDepth++;
307:
308:                    if (!ti.sampleDue) {
309:                        if (methodId <= MAX_METHOD_ID_FOR_COMPACT_FORMAT) {
310:                            writeCompactEvent(
311:                                    ti,
312:                                    (char) (METHOD_ENTRY_COMPACT_MASK | methodId));
313:                        } else {
314:                            writeUnstampedEvent(METHOD_ENTRY_UNSTAMPED, ti,
315:                                    methodId);
316:                        }
317:                    } else {
318:                        writeTimeStampedEvent(METHOD_ENTRY, ti, methodId);
319:                        ti.sampleDue = false;
320:                    }
321:
322:                    ti.inProfilingRuntimeMethod--;
323:                }
324:            }
325:
326:            /** Called upon exit from the method. */
327:            public static void methodExit(char methodId) {
328:                if (recursiveInstrumentationDisabled) {
329:                    return; // See the comment at the recursiveInstrumentationDisabled variable declaration
330:                }
331:
332:                ThreadInfo ti = ThreadInfo.getThreadInfo();
333:
334:                if (ti.isInitialized() && ti.inCallGraph
335:                        && (ti.rootMethodStackDepth > 0)) { // ti == null may happen if instrumentation has been removed or data collectors reset
336:
337:                    if (ti.inProfilingRuntimeMethod > 0) {
338:                        return;
339:                    }
340:
341:                    ti.inProfilingRuntimeMethod++;
342:
343:                    //System.out.println("------methodExit, depth = " + ti.stackDepth + ", id = " + (int) methodId);
344:                    if (ti.rootMethodStackDepth == ti.stackDepth) {
345:                        ti.rootMethodStackDepth = 0;
346:                    }
347:
348:                    ti.stackDepth--;
349:
350:                    if (ti.stackDepth < 1) {
351:                        ti.inCallGraph = false; // We are exiting the root method of our call subgraph
352:                        writeTimeStampedEvent(ROOT_EXIT, ti, methodId);
353:                    } else {
354:                        if (!ti.sampleDue) {
355:                            // short path: not taking time stamp
356:
357:                            // See comment marked with (***)
358:                            methodId = (char) ((int) methodId);
359:
360:                            if (methodId <= MAX_METHOD_ID_FOR_COMPACT_FORMAT) {
361:                                writeCompactEvent(
362:                                        ti,
363:                                        (char) (METHOD_EXIT_COMPACT_MASK | methodId));
364:                            } else {
365:                                writeUnstampedEvent(METHOD_EXIT_UNSTAMPED, ti,
366:                                        methodId);
367:                            }
368:                        } else {
369:                            writeTimeStampedEvent(METHOD_EXIT, ti, methodId);
370:                            ti.sampleDue = false;
371:                        }
372:                    }
373:
374:                    ti.inProfilingRuntimeMethod--;
375:                }
376:            }
377:
378:            /** Called upon entry into a root target application method */
379:            public static void rootMethodEntry(char methodId) {
380:                if (recursiveInstrumentationDisabled) {
381:                    return; // See the comment at the recursiveInstrumentationDisabled variable declaration
382:                }
383:
384:                ThreadInfo ti = ThreadInfo.getThreadInfo();
385:
386:                if (ti.inProfilingRuntimeMethod > 0) {
387:                    return;
388:                }
389:
390:                ProfilerServer.notifyClientOnResultsAvailability();
391:
392:                if (ti.isInitialized() && !ti.inCallGraph
393:                        && (ti.stackDepth > 0)) {
394:                    ti.inCallGraph = true;
395:                    methodEntry(methodId);
396:                    ti.inCallGraph = false;
397:
398:                    return;
399:                }
400:
401:                if ((ti != null) && ti.inCallGraph
402:                        && (ti.rootMethodStackDepth > 0)) {
403:                    methodEntry(methodId);
404:                } else { // Entered the root method from outside this call subgraph
405:                    //if (instrMethodClasses != null && methodId < instrMethodClasses.length) System.out.println("++++++Root methodEntry for " + instrMethodClasses[methodId] + "." + instrMethodNames[methodId] + ", thread = " + Thread.currentThread());
406:                    //else System.out.println("++++++Root methodEntry for methodId = " + (int)methodId + ", thread = " + Thread.currentThread());
407:
408:                    if (!ti.isInitialized()) {
409:                        if ((nProfiledThreadsAllowed > 0)
410:                                && !ThreadInfo
411:                                        .isCurrentThreadProfilerServerThread()) {
412:                            ti.initialize();
413:                            ti.useEventBuffer();
414:
415:                            synchronized (eventBuffer) { // Make this happen atomically wrt. other operations on eventBuffer, such as reset collectors
416:                                nProfiledThreadsAllowed--;
417:                                ti.inProfilingRuntimeMethod++;
418:
419:                                if (!ProfilerServer
420:                                        .startProfilingPointsActive()) {
421:                                    ti.inCallGraph = true;
422:                                }
423:
424:                                writeThreadCreationEvent(ti);
425:                            }
426:                        } else {
427:                            return;
428:                        }
429:                    } else {
430:                        if (ti.stackDepth > 0) {
431:                            ti.rootMethodStackDepth = ti.stackDepth + 1;
432:                            methodEntry(methodId);
433:
434:                            return;
435:                        } else {
436:                            ti.inProfilingRuntimeMethod++;
437:
438:                            if (!ProfilerServer.startProfilingPointsActive()) {
439:                                ti.inCallGraph = true;
440:                            }
441:                        }
442:                    }
443:
444:                    // This is to bypass what seems to be a compiler bug (at least C1 on Windows): when methodId > 64K/2 is passed here
445:                    // using our instrumentation's sipush command at the call site, it's treated here as a signed integer. Thus without
446:                    // the below fix we can get e.g. an ArrayIndexOutOfBoundsException(-32768) when methodId == 32768 (***)
447:                    methodId = (char) ((int) methodId);
448:
449:                    // Check if it's the first invocation of this method, and if so, perform instrumentation of its immediate callees
450:                    if (!instrMethodInvoked[methodId]) {
451:                        externalActionsHandler
452:                                .handleFirstTimeMethodInvoke(methodId);
453:                        instrMethodInvoked[methodId] = true;
454:                    }
455:
456:                    ti.stackDepth++; //= 1;  // This is the logical stack depth
457:                    writeTimeStampedEvent(ROOT_ENTRY, ti, methodId);
458:                    ti.rootMethodStackDepth = ti.stackDepth;
459:                    ti.inProfilingRuntimeMethod--;
460:                }
461:            }
462:
463:            protected static void clearDataStructures() {
464:                ProfilerRuntimeCPU.clearDataStructures();
465:
466:                if (st != null) {
467:                    st.terminate();
468:                }
469:            }
470:
471:            protected static void createNewDataStructures() {
472:                ProfilerRuntimeCPU.createNewDataStructures();
473:                st = new SamplingThread();
474:                st.setPriority(Thread.MAX_PRIORITY);
475:                Threads.recordAdditionalProfilerOwnThread(st);
476:                st.start();
477:            }
478:
479:            // ---------------------------------- Writing profiler events --------------------------------------  
480:
481:            // In order to optimize usage of the event buffer, we exploit the facts that:
482:            // (1) We have just a handful of different events, and thus their normal codes are small numbers, that need a few bits.
483:            // (2) We rarely instrument more than a few thousand methods, so out of 16 bits of char methodId the upper two are usually unused
484:            // (3) Just two events, method entry and method exit, happen ~3 orders of magnitude more often than others.
485:            // (4) When performing sampled instrumentation profiling, most of method entry/exit events don't have a timestamp.
486:            // Given all these observations, we can encode unstamped method entry/exit events with method id <= MAX_METHOD_ID_FOR_COMPACT_FORMAT
487:            // (equal to 0x3FFF, i.e. not using the upper two bits) as just a single char. The uppermost bit determines if the char
488:            // corresponds to a full event stored in the compact format, or to just an event code. The second bit from the top determines
489:            // the actual event - method entry or method exit. Subsequent bits are the method id.
490:
491:            /** Write a two-byte event, such as unstamped method entry/exit in compact format. */
492:            static void writeCompactEvent(ThreadInfo ti, char event) {
493:                // if (printEvents) System.out.println("*** Writing compact event " + (int) event);
494:                ti.evBuf[ti.evBufPos++] = (byte) ((event >> 8) & 0xFF);
495:                ti.evBuf[ti.evBufPos++] = (byte) ((event) & 0xFF);
496:
497:                if (ti.evBufPos > ThreadInfo.evBufPosThreshold) {
498:                    copyLocalBuffer(ti);
499:                }
500:            }
501:
502:            /** Write an unstamped event, such as method entry/exit for a method whose id is > MAX_METHOD_ID_FOR_COMPACT_FORMAT */
503:            static void writeUnstampedEvent(byte eventType, ThreadInfo ti,
504:                    char methodId) {
505:                // if (printEvents) System.out.println("*** Writing unstamped event " + (int) eventType + ", metodId = " + (int)methodId);
506:                byte[] evBuf = ti.evBuf;
507:                int curPos = ti.evBufPos; // It's important to use a local copy for evBufPos, so that evBufPos is at event boundary at any moment
508:                evBuf[curPos++] = eventType;
509:                evBuf[curPos++] = (byte) ((methodId >> 8) & 0xFF);
510:                evBuf[curPos++] = (byte) ((methodId) & 0xFF);
511:                ti.evBufPos = curPos;
512:
513:                if (curPos > ThreadInfo.evBufPosThreshold) {
514:                    copyLocalBuffer(ti);
515:                }
516:            }
517:        }
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