java.lang.Runtime.gc()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中java.lang.Runtime.gc()方法的一些代码示例，展示了Runtime.gc()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Runtime.gc()方法的具体详情如下：
包路径：java.lang.Runtime
类名称：Runtime
方法名：gc

Runtime.gc介绍

[英]Indicates to the VM that it would be a good time to run the garbage collector. Note that this is a hint only. There is no guarantee that the garbage collector will actually be run.
[中]向VM指示运行垃圾回收器的最佳时机。请注意，这只是一个提示。不能保证垃圾收集器将实际运行。

代码示例

代码示例来源：origin: square/okhttp

  1. /**
  2.   * See FinalizationTester for discussion on how to best trigger GC in tests.
  3.   * https://android.googlesource.com/platform/libcore/+/master/support/src/test/java/libcore/
  4.   * java/lang/ref/FinalizationTester.java
  5.   */
  6.  public static void awaitGarbageCollection() throws Exception {
  7.   Runtime.getRuntime().gc();
  8.   Thread.sleep(100);
  9.   System.runFinalization();
  10.  }
  11. }

代码示例来源：origin: square/leakcanary

  1. @Override public void runGc() {
  2.  // Code taken from AOSP FinalizationTest:
  3.  // https://android.googlesource.com/platform/libcore/+/master/support/src/test/java/libcore/
  4.  // java/lang/ref/FinalizationTester.java
  5.  // System.gc() does not garbage collect every time. Runtime.gc() is
  6.  // more likely to perform a gc.
  7.  Runtime.getRuntime().gc();
  8.  enqueueReferences();
  9.  System.runFinalization();
  10. }

代码示例来源：origin: robovm/robovm

  1. /**
  2.  * Indicates to the VM that it would be a good time to run the
  3.  * garbage collector. Note that this is a hint only. There is no guarantee
  4.  * that the garbage collector will actually be run.
  5.  */
  6. public static void gc() {
  7.   Runtime.getRuntime().gc();
  8. }

代码示例来源：origin: cmusphinx/sphinx4

  1. public String execute(CommandInterpreter ci, String[] args) {
  2.   Runtime.getRuntime().gc();
  3.   return "";
  4. }

代码示例来源：origin: skylot/jadx

  1. @Override
  2.   public void mouseClicked(MouseEvent e) {
  3.     Runtime.getRuntime().gc();
  4.     update();
  5.     if (LOG.isDebugEnabled()) {
  6.       LOG.debug("Memory used: {}", Utils.memoryInfo());
  7.     }
  8.   }
  9. });

代码示例来源：origin: Sable/soot

  1. public static long getFreeLiveMemory() {
  2.  Runtime r = Runtime.getRuntime();
  3.  r.gc();
  4.  return r.freeMemory();
  5. }

代码示例来源：origin: dropwizard/dropwizard

  1. @Override
  2. @SuppressWarnings("CallToSystemGC")
  3. public void execute(Map<String, List<String>> parameters, PrintWriter output) {
  4.   final int count = parseRuns(parameters);
  5.   for (int i = 0; i < count; i++) {
  6.     output.println("Running GC...");
  7.     output.flush();
  8.     runtime.gc();
  9.   }
  10.   output.println("Done!");
  11. }

代码示例来源：origin: stanfordnlp/CoreNLP

  1. private static void checkMemoryUsage() {
  2.  Runtime runtime = Runtime.getRuntime();
  3.  runtime.gc();
  4.  long memory = runtime.totalMemory() - runtime.freeMemory();
  5.  log.info("USED MEMORY (bytes): " + memory);
  6. }

代码示例来源：origin: com.h2database/h2

  1. private static synchronized void collectGarbage() {
  2.   Runtime runtime = Runtime.getRuntime();
  3.   long total = runtime.totalMemory();
  4.   long time = System.nanoTime();
  5.   if (lastGC + TimeUnit.MILLISECONDS.toNanos(GC_DELAY) < time) {
  6.     for (int i = 0; i < MAX_GC; i++) {
  7.       runtime.gc();
  8.       long now = runtime.totalMemory();
  9.       if (now == total) {
  10.         lastGC = System.nanoTime();
  11.         break;
  12.       }
  13.       total = now;
  14.     }
  15.   }
  16. }

代码示例来源：origin: javamelody/javamelody

  1. @SuppressWarnings("all")
  2. private long gc() {
  3.   final long before = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
  4.   Runtime.getRuntime().gc();
  5.   final long after = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
  6.   return (before - after) / 1024;
  7. }

代码示例来源：origin: lealone/Lealone

  1. private static synchronized void collectGarbage() {
  2.   Runtime runtime = Runtime.getRuntime();
  3.   long total = runtime.totalMemory();
  4.   long time = System.currentTimeMillis();
  5.   if (lastGC + GC_DELAY < time) {
  6.     for (int i = 0; i < MAX_GC; i++) {
  7.       runtime.gc();
  8.       long now = runtime.totalMemory();
  9.       if (now == total) {
  10.         lastGC = System.currentTimeMillis();
  11.         break;
  12.       }
  13.       total = now;
  14.     }
  15.   }
  16. }

代码示例来源：origin: osmandapp/Osmand

  1. protected static long runGCUsedMemory()  {
  2.   Runtime runtime = Runtime.getRuntime();
  3.   long usedMem1 = runtime.totalMemory() - runtime.freeMemory();
  4.   long usedMem2 = Long.MAX_VALUE;
  5.   int cnt = 4;
  6.   while (cnt-- >= 0) {
  7.     for (int i = 0; (usedMem1 < usedMem2) && (i < 1000); ++i) {
  8.       // AVIAN FIXME
  9.       runtime.runFinalization();
  10.       runtime.gc();
  11.       Thread.yield();
  12.       usedMem2 = usedMem1;
  13.       usedMem1 = runtime.totalMemory() - runtime.freeMemory();
  14.     }
  15.   }
  16.   return usedMem1;
  17. }

代码示例来源：origin: com.h2database/h2

  1. /**
  2.  * Call the garbage collection and run finalization. This close all files
  3.  * that were not closed, and are no longer referenced.
  4.  */
  5. static void freeMemoryAndFinalize() {
  6.   IOUtils.trace("freeMemoryAndFinalize", null, null);
  7.   Runtime rt = Runtime.getRuntime();
  8.   long mem = rt.freeMemory();
  9.   for (int i = 0; i < 16; i++) {
  10.     rt.gc();
  11.     long now = rt.freeMemory();
  12.     rt.runFinalization();
  13.     if (now == mem) {
  14.       break;
  15.     }
  16.     mem = now;
  17.   }
  18. }

代码示例来源：origin: apache/kylin

  1. public static int gcAndGetSystemAvailMB() {
  2.   final int tolerance = 1;
  3.   try {
  4.     int lastMB = -1;
  5.     while (true) {
  6.       Runtime.getRuntime().gc();
  7.       Thread.sleep(1000);
  8.       int thisMB = getSystemAvailMB();
  9.       if (lastMB < 0) {
  10.         lastMB = thisMB;
  11.         continue;
  12.       }
  13.       if (lastMB - thisMB < tolerance) {
  14.         return thisMB;
  15.       }
  16.       lastMB = thisMB;
  17.     }
  18.   } catch (InterruptedException e) {
  19.     Thread.currentThread().interrupt();
  20.     logger.error("", e);
  21.     return getSystemAvailMB();
  22.   }
  23. }

代码示例来源：origin: lealone/Lealone

  1. /**
  2.  * Call the garbage collection and run finalization. This close all files
  3.  * that were not closed, and are no longer referenced.
  4.  */
  5. static void freeMemoryAndFinalize() {
  6.   IOUtils.trace("freeMemoryAndFinalize", null, null);
  7.   Runtime rt = Runtime.getRuntime();
  8.   long mem = rt.freeMemory();
  9.   for (int i = 0; i < 16; i++) {
  10.     rt.gc();
  11.     long now = rt.freeMemory();
  12.     rt.runFinalization();
  13.     if (now == mem) {
  14.       break;
  15.     }
  16.     mem = now;
  17.   }
  18. }

代码示例来源：origin: lipangit/JiaoZiVideoPlayer

  1. public void onAutoCompletion() {
  2.   Runtime.getRuntime().gc();
  3.   Log.i(TAG, "onAutoCompletion " + " [" + this.hashCode() + "] ");
  4.   onEvent(JZUserAction.ON_AUTO_COMPLETE);
  5.   dismissVolumeDialog();
  6.   dismissProgressDialog();
  7.   dismissBrightnessDialog();
  8.   onStateAutoComplete();
  9.   if (currentScreen == SCREEN_WINDOW_FULLSCREEN || currentScreen == SCREEN_WINDOW_TINY) {
  10.     backPress();
  11.   }
  12.   JZMediaManager.instance().releaseMediaPlayer();
  13.   JZUtils.scanForActivity(getContext()).getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  14.   JZUtils.saveProgress(getContext(), jzDataSource.getCurrentUrl(), 0);
  15. }

代码示例来源：origin: apache/drill

  1. public String getMemString(boolean runGC) {
  2.   if (runGC) {
  3.    Runtime.getRuntime().gc();
  4.   }
  5.   long endDirect = manager.getMemDirect();
  6.   long endHeap = manager.getMemHeap();
  7.   long endNonHeap = manager.getMemNonHeap();
  8.   return String.format("d: %s(%s), h: %s(%s), nh: %s(%s)", //
  9.     DrillStringUtils.readable(endDirect - startDirect), DrillStringUtils.readable(endDirect), //
  10.     DrillStringUtils.readable(endHeap - startHeap), DrillStringUtils.readable(endHeap), //
  11.     DrillStringUtils.readable(endNonHeap - startNonHeap), DrillStringUtils.readable(endNonHeap) //
  12.    );
  13.  }
  14. }

代码示例来源：origin: bumptech/glide

  1. @Test
  2. public void submit_withPreviousButNoLongerReferencedIdenticalRequest_completesFromMemoryCache() {
  3.  // We can't allow any mocks (RequestListner, Target etc) to reference this request or the test
  4.  // will fail due to the transient strong reference to the request.
  5.  concurrency.get(
  6.    GlideApp.with(context)
  7.      .load(ResourceIds.raw.canonical)
  8.      .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
  9.      .submit(IMAGE_SIZE_PIXELS, IMAGE_SIZE_PIXELS));
  10.  // Force the collection of weak references now that the listener/request in the first load is no
  11.  // longer referenced.
  12.  Runtime.getRuntime().gc();
  13.  concurrency.pokeMainThread();
  14.  concurrency.get(
  15.    GlideApp.with(context)
  16.      .load(ResourceIds.raw.canonical)
  17.      .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
  18.      .listener(requestListener)
  19.      .submit(IMAGE_SIZE_PIXELS, IMAGE_SIZE_PIXELS));
  20.  verify(requestListener)
  21.    .onResourceReady(
  22.      anyDrawable(),
  23.      any(),
  24.      anyDrawableTarget(),
  25.      eq(DataSource.MEMORY_CACHE),
  26.      anyBoolean());
  27. }

代码示例来源：origin: bumptech/glide

  1. @Test
  2. public void submit_withPreviousButNoLongerReferencedIdenticalRequest_doesNotRecycleBitmap() {
  3.  // We can't allow any mocks (RequestListener, Target etc) to reference this request or the test
  4.  // will fail due to the transient strong reference to the request.
  5.  Bitmap bitmap =
  6.    concurrency.get(
  7.      GlideApp.with(context)
  8.        .asBitmap()
  9.        .load(ResourceIds.raw.canonical)
  10.        .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
  11.        .submit(IMAGE_SIZE_PIXELS, IMAGE_SIZE_PIXELS));
  12.  // Force the collection of weak references now that the listener/request in the first load is no
  13.  // longer referenced.
  14.  Runtime.getRuntime().gc();
  15.  concurrency.pokeMainThread();
  16.  FutureTarget<Bitmap> future = GlideApp.with(context)
  17.    .asBitmap()
  18.    .load(ResourceIds.raw.canonical)
  19.    .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
  20.    .submit(IMAGE_SIZE_PIXELS, IMAGE_SIZE_PIXELS);
  21.  concurrency.get(future);
  22.  Glide.with(context).clear(future);
  23.  clearMemoryCacheOnMainThread();
  24.  BitmapSubject.assertThat(bitmap).isNotRecycled();
  25. }

代码示例来源：origin: bumptech/glide

  1. Runtime.getRuntime().gc();
  2. concurrency.pokeMainThread();
  3. try {

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