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/*
* Copyright 2008 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.javascript.jscomp.NodeUtil.estimateNumLines;
import static com.google.javascript.jscomp.base.JSCompStrings.lines;
import static java.lang.Math.max;
import static java.util.Comparator.comparingLong;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultiset;
import com.google.javascript.jscomp.CompilerOptions.TracerMode;
import com.google.javascript.jscomp.parsing.parser.util.format.SimpleFormat;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;
/**
* A PerformanceTracker collects statistics about the runtime of each pass, and
* how much a pass impacts the size of the compiled output, before and after
* gzip.
*/
public final class PerformanceTracker {
private static final int DEFAULT_WHEN_SIZE_UNTRACKED = -1;
private final Node externsRoot;
private final TracerMode mode;
// Keeps track of AST changes and computes code size estimation
// if there is any.
private final RecentChange codeChange = new RecentChange();
private Node jsRoot;
private int initAstSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private int initCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private int initGzCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private final long startTime;
private long endTime;
private int passesRuntime = 0;
private int maxMem = 0;
private int runs = 0;
private int changes = 0;
private int loopRuns = 0;
private int loopChanges = 0;
private int jsLines = 0;
private int jsSources = 0;
private int externLines = 0;
private int externSources = 0;
// The following fields for tracking size changes are just estimates.
// They do not take into account preserved license blocks, newline padding,
// or pretty printing (if enabled), since they don't use CodePrinter.
// To get exact sizes, call compiler.toSource() for the final generated code.
private int astSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private int codeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private int gzCodeSize = DEFAULT_WHEN_SIZE_UNTRACKED;
private int astDiff = 0;
private int diff = 0;
private int gzDiff = 0;
private final Deque currentPass = new ArrayDeque<>();
/** Cumulative stats for each compiler pass. */
private ImmutableMap passSummary;
private ImmutableMultiset astManifest;
/** Stats a single run of a compiler pass. */
private final List log = new ArrayList<>();
PerformanceTracker(Node externsRoot, Node jsRoot, TracerMode mode) {
checkArgument(mode != TracerMode.OFF, "PerformanceTracker can't work without tracer data.");
this.startTime = System.currentTimeMillis();
this.externsRoot = externsRoot;
this.jsRoot = jsRoot;
this.mode = mode;
}
CodeChangeHandler getCodeChangeHandler() {
return this.codeChange;
}
void recordPassStart(String passName, boolean isOneTime) {
this.currentPass.push(new Stats(passName, isOneTime));
// In Compiler, toSource may be called after every pass X. We don't want it
// to reset the handler, because recordPassStop for pass X has not been
// called, so we are falsely logging that pass X didn't make changes.
if (!passName.equals("toSource")) {
this.codeChange.reset();
}
}
/** Updates the saved jsRoot and resets the size tracking fields accordingly. */
void updateAfterDeserialize(Node jsRoot) {
// TODO(bradfordcsmith): Restore line counts for inputs and externs.
this.jsRoot = jsRoot;
if (!tracksAstSize()) {
return;
}
this.initAstSize = this.astSize = NodeUtil.countAstSize(this.jsRoot);
if (!tracksSize()) {
return;
}
PerformanceTrackerCodeSizeEstimator estimator =
PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
this.initCodeSize = this.codeSize = estimator.getCodeSize();
if (tracksGzSize()) {
this.initGzCodeSize = this.gzCodeSize = estimator.getZippedCodeSize();
}
}
/**
* Collects information about a pass P after P finishes running, eg, how much
* time P took and what was its impact on code size.
*
* @param passName short name of the pass
* @param runtime execution time in milliseconds
*/
void recordPassStop(String passName, long runtime) {
int allocMem = getAllocatedMegabytes();
Stats logStats = this.currentPass.pop();
checkState(passName.equals(logStats.pass));
this.log.add(logStats);
// Update fields that aren't related to code size
logStats.runtime = runtime;
logStats.allocMem = allocMem;
logStats.runs = 1;
if (this.codeChange.hasCodeChanged()) {
logStats.changes = 1;
}
if (passName.equals(PassNames.PARSE_INPUTS)) {
recordParsingStop(logStats);
} else if (this.codeChange.hasCodeChanged() && tracksAstSize()) {
recordOtherPassStop(logStats);
}
}
private void recordParsingStop(Stats logStats) {
if (tracksAstManifest()) {
populateAstManifest();
}
recordInputCount();
if (!tracksAstSize()) {
return;
}
logStats.astSize = this.initAstSize = this.astSize = NodeUtil.countAstSize(jsRoot);
if (!tracksSize()) {
return;
}
PerformanceTrackerCodeSizeEstimator estimator =
PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
logStats.size = this.initCodeSize = this.codeSize = estimator.getCodeSize();
if (tracksGzSize()) {
logStats.gzSize = this.initGzCodeSize = this.gzCodeSize = estimator.getZippedCodeSize();
}
}
private void recordOtherPassStop(Stats logStats) {
int newSize = NodeUtil.countAstSize(this.jsRoot);
logStats.astDiff = this.astSize - newSize;
this.astSize = logStats.astSize = newSize;
if (!tracksSize()) {
return;
}
PerformanceTrackerCodeSizeEstimator estimator =
PerformanceTrackerCodeSizeEstimator.estimate(this.jsRoot, tracksGzSize());
newSize = estimator.getCodeSize();
logStats.diff = this.codeSize - newSize;
this.codeSize = logStats.size = newSize;
if (tracksGzSize()) {
newSize = estimator.getZippedCodeSize();
logStats.gzDiff = this.gzCodeSize - newSize;
this.gzCodeSize = logStats.gzSize = newSize;
}
}
private void recordInputCount() {
for (Node n = this.externsRoot.getFirstChild(); n != null; n = n.getNext()) {
this.externSources += 1;
this.externLines += estimateNumLines(n);
}
for (Node n = this.jsRoot.getFirstChild(); n != null; n = n.getNext()) {
this.jsSources += 1;
this.jsLines += estimateNumLines(n);
}
}
private int bytesToMB(long bytes) {
return (int) (bytes / (1024 * 1024));
}
private int getAllocatedMegabytes() {
return bytesToMB(Platform.totalMemory() - Platform.freeMemory());
}
public boolean tracksSize() {
return this.mode == TracerMode.RAW_SIZE || this.mode == TracerMode.ALL;
}
public boolean tracksGzSize() {
return this.mode == TracerMode.ALL;
}
public boolean tracksAstSize() {
return this.mode != TracerMode.TIMING_ONLY;
}
public boolean tracksAstManifest() {
return this.mode.isOn();
}
public int getRuntime() {
calcTotalStats();
return this.passesRuntime;
}
public int getSize() {
calcTotalStats();
return this.codeSize;
}
public int getGzSize() {
calcTotalStats();
return this.gzCodeSize;
}
public int getAstSize() {
calcTotalStats();
return this.astSize;
}
@VisibleForTesting
int getChanges() {
calcTotalStats();
return this.changes;
}
@VisibleForTesting
int getLoopChanges() {
calcTotalStats();
return this.loopChanges;
}
@VisibleForTesting
int getRuns() {
calcTotalStats();
return this.runs;
}
@VisibleForTesting
int getLoopRuns() {
calcTotalStats();
return this.loopRuns;
}
public ImmutableMap getStats() {
calcTotalStats();
return this.passSummary;
}
private void calcTotalStats() {
// This method only does work the first time it is called
if (this.passSummary != null) {
return;
}
this.endTime = System.currentTimeMillis();
populatePassSummary();
for (Entry entry : this.passSummary.entrySet()) {
Stats stats = entry.getValue();
this.passesRuntime = (int) (this.passesRuntime + stats.runtime);
this.maxMem = max(this.maxMem, stats.allocMem);
this.runs += stats.runs;
this.changes += stats.changes;
if (!stats.isOneTime) {
this.loopRuns += stats.runs;
this.loopChanges += stats.changes;
}
this.astDiff += stats.astDiff;
this.diff += stats.diff;
this.gzDiff += stats.gzDiff;
}
checkState(!tracksAstSize() || this.initAstSize == this.astDiff + this.astSize);
checkState(!tracksSize() || this.initCodeSize == this.diff + this.codeSize);
checkState(!tracksGzSize() || this.initGzCodeSize == this.gzDiff + this.gzCodeSize);
}
private void populatePassSummary() {
HashMap tmpPassSummary = new HashMap<>();
for (Stats logStat : this.log) {
String passName = logStat.pass;
Stats entry =
tmpPassSummary.computeIfAbsent(passName, (String k) -> new Stats(k, logStat.isOneTime));
entry.runtime += logStat.runtime;
entry.allocMem = max(entry.allocMem, logStat.allocMem);
entry.runs++;
entry.changes += logStat.changes;
entry.astDiff += logStat.astDiff;
entry.diff += logStat.diff;
entry.gzDiff += logStat.gzDiff;
// We don't populate the size fields in the passSummary stats.
// We used to put the size after the last time a pass was run, but that is
// a pretty meaningless thing to measure.
}
this.passSummary = ImmutableMap.copyOf(tmpPassSummary);
}
private void populateAstManifest() {
if (this.astManifest != null) {
return;
}
ImmutableMultiset.Builder builder = ImmutableMultiset.builder();
NodeUtil.visitPreOrder(this.jsRoot, (n) -> builder.add(n.getToken()));
this.astManifest = builder.build();
}
/**
* Prints a summary, which contains aggregate stats for all runs of each pass and a log, which
* contains stats for each individual run.
*/
public void outputTracerReport(PrintStream output) {
JvmMetrics.maybeWriteJvmMetrics(output, "verbose:pretty:all");
calcTotalStats();
output.println(
lines(
"",
"TOTAL:",
"Start time(ms): " + this.startTime,
"End time(ms): " + this.endTime,
"Wall time(ms): " + (this.endTime - this.startTime),
"Passes runtime(ms): " + this.passesRuntime,
"Max mem usage (measured after each pass)(MB): " + this.maxMem,
"#Runs: " + this.runs,
"#Changing runs: " + this.changes,
"#Loopable runs: " + this.loopRuns,
"#Changing loopable runs: " + this.loopChanges,
"Estimated AST reduction(#nodes): " + this.astDiff,
"Estimated Reduction(bytes): " + this.diff,
"Estimated GzReduction(bytes): " + this.gzDiff,
"Estimated AST size(#nodes): " + this.astSize,
"Estimated Size(bytes): " + this.codeSize,
"Estimated GzSize(bytes): " + this.gzCodeSize));
output.println(
lines(
"",
"Inputs:",
"JS lines: " + this.jsLines,
"JS sources: " + this.jsSources,
"Extern lines: " + this.externLines,
"Extern sources: " + this.externSources));
output.println(
lines(
"",
"Summary:",
"pass,runtime,allocMem,runs,changingRuns,astReduction,reduction,gzReduction"));
this.passSummary.entrySet().stream()
.sorted(comparingLong((e) -> e.getValue().runtime))
.map(
(entry) -> {
String key = entry.getKey();
Stats stats = entry.getValue();
return SimpleFormat.format(
"%s,%d,%d,%d,%d,%d,%d,%d",
key,
stats.runtime,
stats.allocMem,
stats.runs,
stats.changes,
stats.astDiff,
stats.diff,
stats.gzDiff);
})
.forEach(output::println);
output.println(
lines(
"",
"Log:",
"pass,runtime,allocMem,codeChanged,astReduction,reduction,gzReduction,astSize,size,gzSize"));
for (Stats stats : this.log) {
output.print(
SimpleFormat.format(
"%s,%d,%d,%b,%d,%d,%d,%d,%d,%d\n",
stats.pass,
stats.runtime,
stats.allocMem,
stats.changes == 1,
stats.astDiff,
stats.diff,
stats.gzDiff,
stats.astSize,
stats.size,
stats.gzSize));
}
if (this.astManifest != null) {
output.println(
lines(
"", //
"Input AST Manifest:",
"token,count"));
this.astManifest.entrySet().stream()
.map((e) -> SimpleFormat.format("%s,%d", e.getElement(), e.getCount()))
.sorted()
.forEach(output::println);
}
output.println();
// this.output can be System.out, so don't close it to not lose subsequent
// error messages. Flush to ensure that you will see the tracer report.
try {
// TODO(johnlenz): Remove this cast and try/catch.
// This is here to workaround GWT http://b/30943295
((FilterOutputStream) output).flush();
} catch (IOException e) {
throw new RuntimeException("Unreachable.", e);
}
}
/**
* A Stats object contains statistics about a pass run, such as running time,
* size changes, etc
*/
public static class Stats {
Stats(String pass, boolean iot) {
this.pass = pass;
this.isOneTime = iot;
}
public final String pass;
public final boolean isOneTime;
public long runtime = 0;
public int allocMem = 0;
public int runs = 0;
public int changes = 0;
public int diff = 0;
public int gzDiff = 0;
public int size = 0;
public int gzSize = 0;
public int astDiff = 0;
public int astSize = 0;
}
}
