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Differential Flame Graphs (#1553)

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This commit is contained in:
Andrei Pangin
2026-02-05 00:00:48 +00:00
committed by GitHub
parent 15b1161f57
commit 036c87e50d
12 changed files with 229 additions and 21 deletions
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16
.assets/html/flamegraph.html
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@@ -75,9 +75,11 @@
// SPDX-License-Identifier: Apache-2.0
'use strict';
let root, px, pattern;
let level0 = 0, left0 = 0, width0 = 0;
let level0 = 0, left0 = 0, width0 = 0, d = 0;
let nav = [], navIndex, matchval;
let inverted = false;
const U = undefined;
const maxdiff = -1;
const levels = Array(36);
for (let h = 0; h < levels.length; h++) {
levels[h] = [];
@@ -111,10 +113,18 @@
return '#' + (p[0] + ((p[1] * v) << 16 | (p[2] * v) << 8 | (p[3] * v))).toString(16);
}
function getDiffColor(diff) {
if (diff === U) return '#ffdd33';
if (diff === 0) return '#e0e0e0';
const v = Math.round(128 * (maxdiff - Math.abs(diff)) / maxdiff) + 96;
return diff > 0 ? 'rgb(255,' + v + ',' + v + ')' : 'rgb(' + v + ',' + v + ',255)';
}
function f(key, level, left, width, inln, c1, int) {
levels[level0 = level].push({level, left: left0 += left, width: width0 = width || width0,
color: getColor(palette[key & 7]), title: cpool[key >>> 3],
details: (int ? ', int=' + int : '') + (c1 ? ', c1=' + c1 : '') + (inln ? ', inln=' + inln : '')
color: maxdiff >= 0 ? getDiffColor(d) : getColor(palette[key & 7]),
title: cpool[key >>> 3],
details: (d ? (d > 0 ? ', +' : ', ') + d : '') + (int ? ', int=' + int : '') + (c1 ? ', c1=' + c1 : '') + (inln ? ', inln=' + inln : '')
});
}

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1
.licenserc.yaml
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@@ -15,6 +15,7 @@ header:
- 'src/jattach'
- 'src/res'
- '**/MANIFEST.MF'
- 'test/**/*.collapsed'
license:
content: |
Copyright The async-profiler authors

36
docs/ConverterUsage.md
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@@ -43,6 +43,8 @@ Conversion options:
# otlp: OpenTelemetry profile format.
Differential Flame Graph:
--diff <base-profile> <new-profile>
JFR options:
--cpu Generate only CPU profile during conversion
@@ -120,7 +122,7 @@ jfrconv --cpu foo.jfr
for HTML output as HTML is the default format for conversion from JFR.
#### Flame Graph options
### Flame Graph options
To add a custom title to the generated Flame Graph, use `--title`, which has the default value `Flame Graph`:
@@ -128,9 +130,37 @@ To add a custom title to the generated Flame Graph, use `--title`, which has the
jfrconv --cpu foo.jfr foo.html -r --title "Custom Title"
```
### Other formats
### Differential Flame Graph
`jfrconv` supports converting a JFR file to `collapsed`, `pprof`, `pb.gz` and `heatmap` formats as well.
To find performance regressions, it may be useful to compare current profile
to a previous one that serves as a baseline. Differential Flame Graph
visualizes such a comparsion with a special color scheme:
- Red color denotes frames with more samples comparing to the baseline (i.e. regression);
- Blue is for frames with less samples;
- Yellow are new frames that were absent in the baseline.
The more intense the color, the larger the delta.
For each different frame, the delta value is displayed in a tooltip.
![](/.assets/images/flamegraph_diff.png)
Differential Flame Graph takes the shape of the current profile:
all frames have exactly the same size as in the normal Flame Graph.
This means, frames that exist only in the base profile will not be visible.
To see such frames, create another differential Flame Graph,
swapping the base and the current input file.
To create differential Flame Graph, run `jfrconv --diff` with two input files:
basline profile and new profile. Both files can be in JFR, HTML, or collapsed format.
Other converter options work as usual.
```
jfrconv --cpu --diff baseline.jfr new.jfr diff.html
```
Output file name is optional. If omitted, `jfrconv` takes the name
of the second input file, replacing its extension with `.diff.html`.
## Standalone converter examples

1
src/converter/one/convert/Arguments.java
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@@ -24,6 +24,7 @@ public class Arguments {
public boolean help;
public boolean reverse;
public boolean inverted;
public boolean diff;
public boolean cpu;
public boolean cpuTime;
public boolean wall;

67
src/converter/one/convert/FlameGraph.java
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@@ -20,6 +20,7 @@ public class FlameGraph implements Comparator<Frame> {
private static final String[] FRAME_SUFFIX = {"_[0]", "_[j]", "_[i]", "", "", "_[k]", "_[1]"};
private static final byte HAS_SUFFIX = (byte) 0x80;
private static final int FLUSH_THRESHOLD = 15000;
private static final long NEW_FRAME_DIFF = Long.MIN_VALUE;
private static final Pattern TID_FRAME_PATTERN = Pattern.compile("\\[(.* )?tid=\\d+]");
private final Arguments args;
@@ -29,11 +30,14 @@ public class FlameGraph implements Comparator<Frame> {
private String title = "Flame Graph";
private int[] order;
private int[] cpoolMap;
private int depth;
private int lastLevel;
private long lastX;
private long lastTotal;
private long lastDiff;
private long mintotal;
private long maxdiff = -1;
public FlameGraph(Arguments args) {
this.args = args;
@@ -90,6 +94,8 @@ public class FlameGraph implements Comparator<Frame> {
while (!br.readLine().isEmpty()) ;
for (String line; !(line = br.readLine()).isEmpty(); ) {
if (line.startsWith("d=")) continue; // artifact of a differential flame graph
StringTokenizer st = new StringTokenizer(line.substring(2, line.length() - 1), ",");
int nameAndType = Integer.parseInt(st.nextToken());
@@ -109,12 +115,10 @@ public class FlameGraph implements Comparator<Frame> {
int titleIndex = nameAndType >>> 3;
byte type = (byte) (nameAndType & 7);
if (st.hasMoreTokens() && (type <= TYPE_INLINED || type >= TYPE_C1_COMPILED)) {
type = TYPE_JIT_COMPILED;
}
byte normalizedType = type <= TYPE_INLINED || type >= TYPE_C1_COMPILED ? TYPE_JIT_COMPILED : type;
Frame f = level > 0 || needRebuild ? new Frame(titleIndex, type) : root;
f.self = f.total = total;
Frame f = level > 0 || needRebuild ? new Frame(titleIndex, normalizedType) : root;
fillFrameCounters(f, type, total);
if (st.hasMoreTokens()) f.inlined = Long.parseLong(st.nextToken());
if (st.hasMoreTokens()) f.c1 = Long.parseLong(st.nextToken());
if (st.hasMoreTokens()) f.interpreted = Long.parseLong(st.nextToken());
@@ -177,6 +181,26 @@ public class FlameGraph implements Comparator<Frame> {
depth = Math.max(depth, stack.size);
}
public void diff(FlameGraph base) {
// Build a map that translates this cpool keys to the base flamegraph's cpool keys
cpoolMap = Arrays.stream(cpool.keys()).mapToInt(title -> base.cpool.getOrDefault(title, -1)).toArray();
diff(base.root, root);
}
private void diff(Frame base, Frame current) {
current.diff = base == null ? NEW_FRAME_DIFF : current.self - base.self;
maxdiff = Math.max(maxdiff, Math.abs(current.diff));
for (Frame child : current.values()) {
Frame baseChild = base == null ? null : base.get(translateKey(child.key));
diff(baseChild, child);
}
}
private int translateKey(int key) {
return cpoolMap[key & TITLE_MASK] | (key & ~TITLE_MASK);
}
public void dump(OutputStream out) throws IOException {
try (PrintStream ps = new PrintStream(out, false, "UTF-8")) {
dump(ps);
@@ -205,6 +229,9 @@ public class FlameGraph implements Comparator<Frame> {
tail = printTill(out, tail, "/*inverted:*/false");
out.print(args.reverse ^ args.inverted);
tail = printTill(out, tail, "/*maxdiff:*/-1");
out.print(maxdiff);
tail = printTill(out, tail, "/*depth:*/0");
out.print(depth);
@@ -239,6 +266,15 @@ public class FlameGraph implements Comparator<Frame> {
}
private void printFrame(PrintStream out, Frame frame, int level, long x) {
StringBuilder sb = outbuf;
if (frame.diff != lastDiff) {
if (frame.diff == NEW_FRAME_DIFF) {
sb.append("d=U\n");
} else {
sb.append("d=").append(frame.diff).append('\n');
}
}
int nameAndType = order[frame.getTitleIndex()] << 3 | frame.getType();
boolean hasExtraTypes = (frame.inlined | frame.c1 | frame.interpreted) != 0 &&
frame.inlined < frame.total && frame.interpreted < frame.total;
@@ -250,7 +286,7 @@ public class FlameGraph implements Comparator<Frame> {
func = 'n';
}
StringBuilder sb = outbuf.append(func).append('(').append(nameAndType);
sb.append(func).append('(').append(nameAndType);
if (func == 'f') {
sb.append(',').append(level).append(',').append(x - lastX);
}
@@ -270,6 +306,7 @@ public class FlameGraph implements Comparator<Frame> {
lastLevel = level;
lastX = x;
lastTotal = frame.total;
lastDiff = frame.diff;
Frame[] children = frame.values().toArray(EMPTY_FRAME_ARRAY);
Arrays.sort(children, this);
@@ -291,6 +328,9 @@ public class FlameGraph implements Comparator<Frame> {
sb.append(strings[frame.getTitleIndex()]).append(FRAME_SUFFIX[frame.getType()]);
if (frame.self > 0) {
int tmpLength = sb.length();
if (maxdiff >= 0) {
sb.append(' ').append(frame.diff == NEW_FRAME_DIFF ? 0 : frame.self - frame.diff);
}
out.print(sb.append(' ').append(frame.self).append('\n'));
sb.setLength(tmpLength);
}
@@ -328,6 +368,21 @@ public class FlameGraph implements Comparator<Frame> {
return include != null;
}
private static void fillFrameCounters(Frame frame, byte type, long ticks) {
frame.self = frame.total = ticks;
switch (type) {
case TYPE_INTERPRETED:
frame.interpreted = ticks;
break;
case TYPE_INLINED:
frame.inlined = ticks;
break;
case TYPE_C1_COMPILED:
frame.c1 = ticks;
break;
}
}
private Frame addChild(Frame frame, String title, byte type, long ticks) {
frame.total += ticks;

6
src/converter/one/convert/Frame.java
View File

@@ -16,11 +16,13 @@ public class Frame extends HashMap<Integer, Frame> {
public static final byte TYPE_KERNEL = 5;
public static final byte TYPE_C1_COMPILED = 6;
private static final int TYPE_SHIFT = 28;
static final int TYPE_SHIFT = 28;
static final int TITLE_MASK = (1 << TYPE_SHIFT) - 1;
final int key;
long total;
long self;
long diff;
long inlined, c1, interpreted;
private Frame(int key) {
@@ -36,7 +38,7 @@ public class Frame extends HashMap<Integer, Frame> {
}
int getTitleIndex() {
return key & ((1 << TYPE_SHIFT) - 1);
return key & TITLE_MASK;
}
byte getType() {

32
src/converter/one/convert/Main.java
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@@ -7,6 +7,7 @@ package one.convert;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class Main {
@@ -18,7 +19,7 @@ public class Main {
return;
}
if (args.files.size() == 1) {
if (args.files.size() == (args.diff ? 2 : 1)) {
args.files.add(".");
}
@@ -35,6 +36,34 @@ public class Main {
}
}
if (args.diff) {
if (fileCount != 2) {
throw new IllegalArgumentException("--diff option requires two input files");
}
if (!"html".equals(args.output) && !"collapsed".equals(args.output)) {
throw new IllegalArgumentException("--diff option requires html or collapsed output format");
}
args.norm = true; // don't let random IDs in class names spoil comparison
String input1 = args.files.get(0);
String input2 = args.files.get(1);
String output = isDirectory ? new File(lastFile, replaceExt(input2, "diff." + args.output)).getPath() : lastFile;
System.out.print("Converting " + getFileName(input2) + " vs " + getFileName(input1) + " -> " + getFileName(output) + " ");
System.out.flush();
long startTime = System.nanoTime();
FlameGraph base = parseFlameGraph(input1, args);
FlameGraph current = parseFlameGraph(input2, args);
current.diff(base);
current.dump(new FileOutputStream(output));
long endTime = System.nanoTime();
System.out.print("# " + (endTime - startTime) / 1000000 / 1000.0 + " s\n");
return;
}
for (int i = 0; i < fileCount; i++) {
String input = args.files.get(i);
String output = isDirectory ? new File(lastFile, replaceExt(input, args.output)).getPath() : lastFile;
@@ -106,6 +135,7 @@ public class Main {
" -o --output FORMAT Output format: html, collapsed, pprof, pb.gz, heatmap, otlp\n" +
" -I --include REGEX Include only stacks with the specified frames\n" +
" -X --exclude REGEX Exclude stacks with the specified frames\n" +
" --diff Create differential Flame Graph from two input files\n" +
"\n" +
"JFR options:\n" +
" --cpu CPU profile (ExecutionSample)\n" +

16
src/res/flame.html
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@@ -75,9 +75,11 @@
// SPDX-License-Identifier: Apache-2.0
'use strict';
let root, px, pattern;
let level0 = 0, left0 = 0, width0 = 0;
let level0 = 0, left0 = 0, width0 = 0, d = 0;
let nav = [], navIndex, matchval;
let inverted = /*inverted:*/false;
const U = undefined;
const maxdiff = /*maxdiff:*/-1;
const levels = Array(/*depth:*/0);
for (let h = 0; h < levels.length; h++) {
levels[h] = [];
@@ -111,10 +113,18 @@
return '#' + (p[0] + ((p[1] * v) << 16 | (p[2] * v) << 8 | (p[3] * v))).toString(16);
}
function getDiffColor(diff) {
if (diff === U) return '#ffdd33';
if (diff === 0) return '#e0e0e0';
const v = Math.round(128 * (maxdiff - Math.abs(diff)) / maxdiff) + 96;
return diff > 0 ? 'rgb(255,' + v + ',' + v + ')' : 'rgb(' + v + ',' + v + ',255)';
}
function f(key, level, left, width, inln, c1, int) {
levels[level0 = level].push({level, left: left0 += left, width: width0 = width || width0,
color: getColor(palette[key & 7]), title: cpool[key >>> 3],
details: (int ? ', int=' + int : '') + (c1 ? ', c1=' + c1 : '') + (inln ? ', inln=' + inln : '')
color: maxdiff >= 0 ? getDiffColor(d) : getColor(palette[key & 7]),
title: cpool[key >>> 3],
details: (d ? (d > 0 ? ', +' : ', ') + d : '') + (int ? ', int=' + int : '') + (c1 ? ', c1=' + c1 : '') + (inln ? ', inln=' + inln : '')
});
}

41
test/test/jfrconverter/JfrconverterTests.java
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@@ -5,13 +5,19 @@
package test.jfrconverter;
import test.otlp.CpuBurner;
import one.convert.*;
import one.jfr.JfrReader;
import one.jfr.StackTrace;
import one.jfr.event.Event;
import one.jfr.event.EventCollector;
import one.jfr.StackTrace;
import one.profiler.test.*;
import one.profiler.test.Output;
import one.profiler.test.Test;
import one.profiler.test.TestProcess;
import test.otlp.CpuBurner;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
// Simple smoke tests for JFR converter. The output is not inspected for errors,
// we only verify that the conversion completes successfully.
@@ -72,4 +78,33 @@ public class JfrconverterTests {
assert !found[3];
}
}
@Test(mainClass = Main.class, args = "--diff test/test/jfrconverter/sample1.collapsed test/test/jfrconverter/sample2.collapsed %diff.collapsed")
public void diffCollapsed(TestProcess p) throws Exception {
Output out = p.waitForExit("%diff");
assert out.containsExact("BusyClient.run_[j] 4 1");
assert out.containsExact("BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j] 2 2");
assert out.containsExact("ByteBuffer.get_[i];ByteBuffer.getArray_[i] 0 1");
assert out.samples("ByteBuffer.get") == 2;
}
@Test(mainClass = Main.class, args = "--diff test/test/jfrconverter/sample1.collapsed test/test/jfrconverter/sample2.collapsed %diff.html")
public void diffHtml(TestProcess p) throws Exception {
Output out = p.waitForExit("%diff");
assert out.containsExact("d=-3");
assert out.containsExact("d=0");
assert out.containsExact("d=U");
// It should be possible to reconstruct original FlameGraph from the differential one
byte[] original = buildFlameGraph("test/test/jfrconverter/sample2.collapsed");
byte[] reconstructed = buildFlameGraph(p.getFilePath("%diff"));
assert Arrays.equals(original, reconstructed);
}
private static byte[] buildFlameGraph(String input) throws IOException {
FlameGraph fg = FlameGraph.parse(input, new Arguments());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
fg.dump(baos);
return baos.toByteArray();
}
}

17
test/test/jfrconverter/sample1.collapsed Normal file
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@@ -0,0 +1,17 @@
BusyClient.run_[j] 4
BusyClient.run_[j];InputStream.read_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j] 2
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.beginRead_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.beginRead_[i];NativeThread.current_[i];NativeThread.current0_[j] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.endRead_[i] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];Util.getTemporaryDirectBuffer_[i];CarrierThreadLocal.get_[i];System$2.getCarrierThreadLocal_[i];ThreadLocal.getCarrierThreadLocal_[i];jlong_disjoint_arraycopy 15
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];Util.getTemporaryDirectBuffer_[i];Util$BufferCache.get_[i];Buffer.capacity_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i];SocketDispatcher.read0_[j] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i];SocketDispatcher.read0_[j];Java_sun_nio_ch_SocketDispatcher_read0;read 143
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];ReentrantLock.lock_[i];ReentrantLock$Sync.lock_[i];ReentrantLock$NonfairSync.initialTryLock_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];ReentrantLock.lock_[i];ReentrantLock$Sync.lock_[i];ReentrantLock$NonfairSync.initialTryLock_[i];AbstractQueuedSynchronizer.compareAndSetState_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];ReentrantLock.unlock_[i];AbstractQueuedSynchronizer.release_[i];ReentrantLock$Sync.tryRelease_[i];AbstractQueuedSynchronizer.setState_[i] 1

17
test/test/jfrconverter/sample2.collapsed Normal file
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@@ -0,0 +1,17 @@
BusyClient.run_[j] 1
BusyClient.run_[j];InputStream.read_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j] 2
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.beginRead_[i] 3
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.beginRead_[i];NativeThread.current_[i];NativeThread.current0_[j] 4
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.endRead_[i] 4
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];ByteBuffer.get_[i];ByteBuffer.getArray_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];ByteBuffer.get_[i];Buffer.position_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];Util.getTemporaryDirectBuffer_[i];CarrierThreadLocal.get_[i];System$2.getCarrierThreadLocal_[i];ThreadLocal.getCarrierThreadLocal_[i];jlong_disjoint_arraycopy 6
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i];SocketDispatcher.read0_[j] 4
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i];SocketDispatcher.read0_[j];Java_sun_nio_ch_SocketDispatcher_read0 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];NioSocketImpl.implRead_[j];NioSocketImpl.tryRead_[j];SocketDispatcher.read_[i];SocketDispatcher.read0_[j];Java_sun_nio_ch_SocketDispatcher_read0;read 151
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];ReentrantLock.lock_[i] 1
BusyClient.run_[j];InputStream.read_[j];Socket$SocketInputStream.read_[j];NioSocketImpl$1.read_[j];NioSocketImpl.read_[j];ReentrantLock.unlock_[i];AbstractQueuedSynchronizer.release_[i];ReentrantLock$Sync.tryRelease_[i];AbstractQueuedSynchronizer.setState_[i] 3