java.lang.Runtime.maxMemory()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.maxMemory()方法的一些代码示例，展示了Runtime.maxMemory()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.maxMemory()方法的具体详情如下：
包路径：java.lang.Runtime
类名称：Runtime
方法名：maxMemory

Runtime.maxMemory介绍

[英]Returns the maximum number of bytes the heap can expand to. See #totalMemory for the current number of bytes taken by the heap, and #freeMemory for the current number of those bytes actually used by live objects.
[中]返回堆可以扩展到的最大字节数。请参见#totalMemory了解堆当前占用的字节数，以及#freeMemory了解活动对象实际使用的字节数。

代码示例

代码示例来源：origin: skylot/jadx

/**
 * @return 20% of the maximum heap size limited to 512 MB (bytes)
 */
public static long calculateMinFreeMemory() {
  Runtime runtime = Runtime.getRuntime();
  long minFree = (long) (runtime.maxMemory() * 0.2);
  return Math.min(minFree, 512 * 1024L * 1024L);
}

代码示例来源：origin: stackoverflow.com

Runtime rt = Runtime.getRuntime();
long maxMemory = rt.maxMemory();
Log.v("onCreate", "maxMemory:" + Long.toString(maxMemory));

代码示例来源：origin: skylot/jadx

public static boolean isFreeMemoryAvailable() {
  Runtime runtime = Runtime.getRuntime();
  long maxMemory = runtime.maxMemory();
  long totalFree = runtime.freeMemory() + (maxMemory - runtime.totalMemory());
  return totalFree > MIN_FREE_MEMORY;
}

代码示例来源：origin: apache/incubator-druid

public long getMaxHeapSizeBytes()
{
 return Runtime.getRuntime().maxMemory();
}

代码示例来源：origin: apache/incubator-dubbo

@Override
public Status check() {
  Runtime runtime = Runtime.getRuntime();
  long freeMemory = runtime.freeMemory();
  long totalMemory = runtime.totalMemory();
  long maxMemory = runtime.maxMemory();
  boolean ok = (maxMemory - (totalMemory - freeMemory) > 2048); // Alarm when spare memory < 2M
  String msg = "max:" + (maxMemory / 1024 / 1024) + "M,total:"
      + (totalMemory / 1024 / 1024) + "M,used:" + ((totalMemory / 1024 / 1024) - (freeMemory / 1024 / 1024)) + "M,free:" + (freeMemory / 1024 / 1024) + "M";
  return new Status(ok ? Status.Level.OK : Status.Level.WARN, msg);
}

代码示例来源：origin: apache/incubator-dubbo

@Override
public Status check() {
  Runtime runtime = Runtime.getRuntime();
  long freeMemory = runtime.freeMemory();
  long totalMemory = runtime.totalMemory();
  long maxMemory = runtime.maxMemory();
  boolean ok = (maxMemory - (totalMemory - freeMemory) > 2048); // Alarm when spare memory < 2M
  String msg = "max:" + (maxMemory / 1024 / 1024) + "M,total:"
      + (totalMemory / 1024 / 1024) + "M,used:" + ((totalMemory / 1024 / 1024) - (freeMemory / 1024 / 1024)) + "M,free:" + (freeMemory / 1024 / 1024) + "M";
  return new Status(ok ? Status.Level.OK : Status.Level.WARN, msg);
}

代码示例来源：origin: neo4j/neo4j

private double determineGoodBufferSize( double atLeast )
{
  double heapHint = Runtime.getRuntime().maxMemory() / (1024 * 1024 * 14);
  double result = Math.max( atLeast, heapHint );
  return Math.min( result, 700 );
}

代码示例来源：origin: stanfordnlp/CoreNLP

public int getMaxAvailableMemory(boolean accurate) {
 if (accurate) {
  System.gc();
 }
 return (int) ((r.maxMemory() - r.totalMemory() + r.freeMemory()) / 1024);
}

代码示例来源：origin: redisson/redisson

/**
 * Returns the amount of available memory (free memory plus never allocated memory).
 */
public static long availableMemory() {
  return Runtime.getRuntime().freeMemory() + (Runtime.getRuntime().maxMemory() - Runtime.getRuntime().totalMemory());
}

代码示例来源：origin: redisson/redisson

/**
 * Returns the amount of available memory in percents.
 */
public static float availableMemoryPercent() {
  return availableMemory() * 100.0f / Runtime.getRuntime().maxMemory();
}

代码示例来源：origin: apache/flink

private static void verifyJvmOptions() {
  long heap = Runtime.getRuntime().maxMemory() >> 20;
  Assert.assertTrue("Insufficient java heap space " + heap + "mb - set JVM option: -Xmx" + MINIMUM_HEAP_SIZE_MB
      + "m", heap > MINIMUM_HEAP_SIZE_MB - 50);
}

代码示例来源：origin: skylot/jadx

public void update() {
  long used = runtime.totalMemory() - runtime.freeMemory();
  int usedKB = (int) (used / 1024);
  setValue(usedKB);
  setString(String.format(textFormat, (usedKB / TWO_TO_20), maxGB));
  if ((used + Utils.MIN_FREE_MEMORY) > runtime.maxMemory()) {
    setForeground(RED);
  } else {
    setForeground(GREEN);
  }
}

代码示例来源：origin: prestodb/presto

@Inject
public LocalMemoryManager(NodeMemoryConfig config, ReservedSystemMemoryConfig systemMemoryConfig)
{
  requireNonNull(config, "config is null");
  long availableMemory = Runtime.getRuntime().maxMemory();
  if (config.isLegacySystemPoolEnabled()) {
    configureLegacyMemoryPools(config, systemMemoryConfig, availableMemory);
  }
  else {
    configureMemoryPools(config, availableMemory);
  }
}

代码示例来源：origin: neo4j/neo4j

private static String memoryStats()
{
  Runtime runtime = Runtime.getRuntime();
  return format( "Memory[used:%s, free:%s, total:%s, max:%s]",
      Format.bytes( runtime.totalMemory() - runtime.freeMemory() ),
      Format.bytes( runtime.freeMemory() ),
      Format.bytes( runtime.totalMemory() ),
      Format.bytes( runtime.maxMemory() ) );
}

代码示例来源：origin: skylot/jadx

public static String memoryInfo() {
  Runtime runtime = Runtime.getRuntime();
  long maxMemory = runtime.maxMemory();
  long allocatedMemory = runtime.totalMemory();
  long freeMemory = runtime.freeMemory();
  return "heap: " + format(allocatedMemory - freeMemory) +
      ", allocated: " + format(allocatedMemory) +
      ", free: " + format(freeMemory) +
      ", total free: " + format(freeMemory + maxMemory - allocatedMemory) +
      ", max: " + format(maxMemory);
}

代码示例来源：origin: greenrobot/EventBus

@Test
public void testUnregisterNotLeaking() {
  int heapMBytes = (int) (Runtime.getRuntime().maxMemory() / (1024L * 1024L));
  for (int i = 0; i < heapMBytes * 2; i++) {
    @SuppressWarnings("unused")
    EventBusBasicTest subscriber = new EventBusBasicTest() {
      byte[] expensiveObject = new byte[1024 * 1024];
    };
    eventBus.register(subscriber);
    eventBus.unregister(subscriber);
    log("Iteration " + i + " / max heap: " + heapMBytes);
  }
}

代码示例来源：origin: apache/flink

private static void verifyJvmOptions() {
  final long heap = Runtime.getRuntime().maxMemory() >> 20;
  Assert.assertTrue("Insufficient java heap space " + heap + "mb - set JVM option: -Xmx" + MINIMUM_HEAP_SIZE_MB
      + "m", heap > MINIMUM_HEAP_SIZE_MB - 50);
}

代码示例来源：origin: neo4j/neo4j

public void dumpConfiguration()
{
  checkPageSize( config );
  String pageCacheMemory = config.get( pagecache_memory );
  long totalPhysicalMemory = OsBeanUtil.getTotalPhysicalMemory();
  String totalPhysicalMemMb = (totalPhysicalMemory == OsBeanUtil.VALUE_UNAVAILABLE)
                ? "?" : "" + ByteUnit.Byte.toMebiBytes( totalPhysicalMemory );
  long maxVmUsageMb = ByteUnit.Byte.toMebiBytes( Runtime.getRuntime().maxMemory() );
  String msg = "Physical mem: " + totalPhysicalMemMb + " MiB," +
         " Heap size: " + maxVmUsageMb + " MiB," +
         " Page cache: " + pageCacheMemory + ".";
  log.info( msg );
}

代码示例来源：origin: skylot/jadx

public HeapUsageBar() {
  this.textFormat = NLS.str("heapUsage.text");
  setBorderPainted(false);
  setStringPainted(true);
  setValue(10);
  int maxKB = (int) (runtime.maxMemory() / 1024);
  setMaximum(maxKB);
  maxGB = maxKB / TWO_TO_20;
  update();
  timer = new Timer(2000, this);
  addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
      Runtime.getRuntime().gc();
      update();
      if (LOG.isDebugEnabled()) {
        LOG.debug("Memory used: {}", Utils.memoryInfo());
      }
    }
  });
}

代码示例来源：origin: greenrobot/EventBus

@Test
public void testUnregisterNotLeaking() {
  int heapMBytes = (int) (Runtime.getRuntime().maxMemory() / (1024L * 1024L));
  for (int i = 0; i < heapMBytes * 2; i++) {
    @SuppressWarnings("unused")
    EventBusBasicTest subscriber = new EventBusBasicTest() {
      byte[] expensiveObject = new byte[1024 * 1024];
    };
    eventBus.register(subscriber);
    eventBus.unregister(subscriber);
    log("Iteration " + i + " / max heap: " + heapMBytes);
  }
}

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