Example usage for java.lang Runtime freeMemory

Introduction

In this page you can find the example usage for java.lang Runtime freeMemory.

Prototype

public native long freeMemory();

Source Link

Document

Returns the amount of free memory in the Java Virtual Machine.

Usage

From source file:com.nridge.core.base.std.Platform.java

/**
 * Create a log message containing JVM Heap Memory statistics.
 * <p>totalMemory(): Returns the total amount of memory in the
 * Java virtual machine. The value returned by this method may
 * vary over time, depending on the host environment. Note that
 * the amount of memory required to hold an object of any given
 * type may be implementation-dependent.</p>
 * <p>maxMemory(): Returns the maximum amount of memory that the
 * Java virtual machine will attempt to use. If there is no inherent
 * limit then the value Long.MAX_VALUE will be returned.</p>
 * <p>freeMemory(): Returns the amount of free memory in the Java
 * Virtual Machine. Calling the gc method may result in increasing
 * the value returned by freeMemory.</p>
 * <p>In reference to your question, maxMemory() returns the -Xmx value.
 * You may be wondering why there is a totalMemory() AND a maxMemory().
 * The answer is that the JVM allocates memory lazily.</p>
 *
 * @param aTitle Title to save with log entry.
 *
 * @return Log message.//from  www  . j a  va2  s  .  c o  m
 *
 * @see <a href="http://stackoverflow.com/questions/3571203/what-is-the-exact-meaning-of-runtime-getruntime-totalmemory-and-freememory">Runtime Memory</a>
 * @see <a href="http://www.mkyong.com/java/find-out-your-java-heap-memory-size/">Heap Memory</a>
 * @see <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html">JavaDoc Runtime</a>
 */
public static String jvmLogMessage(String aTitle) {
    Runtime jvmRuntime = Runtime.getRuntime();

    if (StringUtils.isEmpty(aTitle))
        aTitle = "JVM";

    long maxMemory = jvmRuntime.maxMemory();
    long freeMemory = jvmRuntime.freeMemory();
    long totalMemory = jvmRuntime.totalMemory();
    long usedMemory = totalMemory - freeMemory;
    long availMemory = maxMemory - usedMemory;

    String logMsg = String.format("%s: Processors: %d, Mem Max: %s, Mem Total: %s, Mem Used: %s, Mem Avail: %s",
            aTitle, jvmRuntime.availableProcessors(), bytesToString(maxMemory), bytesToString(totalMemory),
            bytesToString(usedMemory), bytesToString(availMemory));
    return logMsg;
}

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From source file:com.fizzed.rocker.ConstantPoolMain.java

static public void garbageCollectAndPrintMemory() {

    //Getting the runtime reference from system
    Runtime runtime = Runtime.getRuntime();

    runtime.gc();/*  w w  w  .  j a v  a  2 s .  c om*/

    //System.out.println("##### Heap utilization statistics [MB] #####");

    //Print used memory
    System.out.println("Used Memory: " + (runtime.totalMemory() - runtime.freeMemory()));

    //Print free memory
    /**
    System.out.println("Free Memory:"
    + runtime.freeMemory());
             
    //Print total available memory
    System.out.println("Total Memory:" + runtime.totalMemory());
            
    //Print Maximum available memory
    System.out.println("Max Memory:" + runtime.maxMemory());
    */
}

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From source file:com.fizzed.rocker.bin.ConstantPoolMain.java

static public void garbageCollectAndPrintMemory() {

    //Getting the runtime reference from system
    Runtime runtime = Runtime.getRuntime();

    runtime.gc();//w ww  . j av  a2s.com

    //System.out.println("##### Heap utilization statistics [MB] #####");

    //Print used memory
    System.out.println("Used Memory: " + (runtime.totalMemory() - runtime.freeMemory()));

    //Print free memory
    /**
    System.out.println("Free Memory:"
    + runtime.freeMemory());
            
    //Print total available memory
    System.out.println("Total Memory:" + runtime.totalMemory());
            
    //Print Maximum available memory
    System.out.println("Max Memory:" + runtime.maxMemory());
    */
}

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From source file:eu.stratosphere.nephele.instance.HardwareDescriptionFactory.java

/**
 * Returns the size of free memory in bytes available to the JVM.
 * //from ww w.ja v a 2s . c om
 * @return the size of the free memory in bytes available to the JVM or <code>-1</code> if the size cannot be
 *         determined
 */
private static long getSizeOfFreeMemory() {
    float fractionToUse = GlobalConfiguration.getFloat(ConfigConstants.TASK_MANAGER_MEMORY_FRACTION_KEY,
            ConfigConstants.DEFAULT_MEMORY_MANAGER_MEMORY_FRACTION);

    Runtime r = Runtime.getRuntime();
    long max = r.maxMemory();
    long total = r.totalMemory();
    long free = r.freeMemory();

    long available = max - total + free;
    return (long) (fractionToUse * available);
}

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From source file:org.soitoolkit.commons.mule.util.MiscUtil.java

private static void printMemUsage() {
    int mb = 1024 * 1024;

    MemoryMXBean mxb = ManagementFactory.getMemoryMXBean();
    MemoryUsage hm = mxb.getHeapMemoryUsage();
    MemoryUsage nhm = mxb.getNonHeapMemoryUsage();
    //      int finalizable = mxb.getObjectPendingFinalizationCount();

    logger.trace("Heap Memory:  init/used/committed/max=" + hm.getInit() / mb + "/" + hm.getUsed() / mb + "/"
            + hm.getCommitted() / mb + "/" + hm.getMax() / mb);
    logger.trace("Non-Heap Mem: init/used/committed/max=" + nhm.getInit() / mb + "/" + nhm.getUsed() / mb + "/"
            + nhm.getCommitted() / mb + "/" + nhm.getMax() / mb);
    //                 logger.trace("finalizable: " + finalizable);

    //Getting the runtime reference from system
    Runtime runtime = Runtime.getRuntime();

    logger.trace("Used/Free/Total/Max:"
            //Print used memory
            + (runtime.totalMemory() - runtime.freeMemory()) / mb + "/"

            //Print free memory
            + runtime.freeMemory() / mb + "/"

            //Print total available memory
            + runtime.totalMemory() / mb + "/"

            //Print Maximum available memory
            + runtime.maxMemory() / mb);
}

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From source file:org.apache.solr.handler.admin.SystemInfoHandler.java

/**
 * Get JVM Info - including memory info//from   ww w  .j a  v a 2 s  .  c om
 */
public static SimpleOrderedMap<Object> getJvmInfo() {
    SimpleOrderedMap<Object> jvm = new SimpleOrderedMap<Object>();
    jvm.add("version", System.getProperty("java.vm.version"));
    jvm.add("name", System.getProperty("java.vm.name"));

    Runtime runtime = Runtime.getRuntime();
    jvm.add("processors", runtime.availableProcessors());

    long used = runtime.totalMemory() - runtime.freeMemory();
    // not thread safe, but could be thread local
    DecimalFormat df = new DecimalFormat("#.#");
    double percentUsed = ((double) (used) / (double) runtime.maxMemory()) * 100;

    SimpleOrderedMap<Object> mem = new SimpleOrderedMap<Object>();
    mem.add("free", humanReadableUnits(runtime.freeMemory(), df));
    mem.add("total", humanReadableUnits(runtime.totalMemory(), df));
    mem.add("max", humanReadableUnits(runtime.maxMemory(), df));
    mem.add("used", humanReadableUnits(used, df) + " (%" + df.format(percentUsed) + ")");
    jvm.add("memory", mem);

    // JMX properties -- probably should be moved to a different handler
    SimpleOrderedMap<Object> jmx = new SimpleOrderedMap<Object>();
    try {
        RuntimeMXBean mx = ManagementFactory.getRuntimeMXBean();
        jmx.add("bootclasspath", mx.getBootClassPath());
        jmx.add("classpath", mx.getClassPath());

        // the input arguments passed to the Java virtual machine
        // which does not include the arguments to the main method.
        jmx.add("commandLineArgs", mx.getInputArguments());
        // a map of names and values of all system properties.
        //jmx.add( "SYSTEM PROPERTIES", mx.getSystemProperties());

        jmx.add("startTime", new Date(mx.getStartTime()));
        jmx.add("upTimeMS", mx.getUptime());
    } catch (Exception e) {
        log.warn("Error getting JMX properties", e);
    }
    jvm.add("jmx", jmx);
    return jvm;
}

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From source file:io.bitsquare.common.util.Utilities.java

public static void printSystemLoad() {
    Runtime runtime = Runtime.getRuntime();
    long free = runtime.freeMemory() / 1024 / 1024;
    long total = runtime.totalMemory() / 1024 / 1024;
    long used = total - free;
    log.info("System load (no. threads/used memory (MB)): " + Thread.activeCount() + "/" + used);
}

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From source file:org.eclipse.wb.internal.core.editor.errors.report2.EnvironmentFileReportInfo.java

private static String createContents(IProject project) {
    String c = "";
    c += "Product Name: " + BrandingUtils.getBranding().getProductName() + CR;
    c += "Product Version: " + ProductInfo.getProduct().getVersion() + "[" + ProductInfo.getProduct().getBuild()
            + "]" + CR;
    c += "Installation Path: " + getInstallationPath() + CR;
    c += "Eclipse Version: " + PlatformInfo.getEclipseVersion().toString() + CR;
    c += "Eclipse Build Name: " + PlatformInfo.getEclipseBuildName() + CR;
    c += "Eclipse Build ID: " + PlatformInfo.getEclipseBuildId() + CR;
    c += "IDE Name: " + PlatformInfo.getIDEName() + CR;
    c += "IDE Version: " + PlatformInfo.getIDEVersionString() + CR;
    c += "IDE NL: " + PlatformInfo.getIDENL() + CR;
    c += "Eclipse Commands: " + StringUtils.replaceChars(getSystemProperty("eclipse.commands"), "\n\r", " ")
            + CR;/*w  ww .  ja  v  a  2 s .  co m*/
    c += "Eclipse VM: " + getSystemProperty("eclipse.vm") + CR;
    c += "Eclipse VM Args: " + getSystemProperty("eclipse.vmargs") + CR;
    c += "OS Name: " + getSystemProperty("os.name") + CR;
    c += "OS Arch: " + getSystemProperty("os.arch") + CR;
    c += "OS Version: " + getSystemProperty("os.version") + CR;
    String linuxDescription = getLinuxDescription();
    if (!StringUtils.isEmpty(linuxDescription)) {
        c += "Linux Description: " + linuxDescription + CR;
    }
    String m_mozillaResult = tryCreateMozilla();
    if (!StringUtils.isEmpty(m_mozillaResult)) {
        c += "Browser Creation Result: " + m_mozillaResult + CR;
    }
    Runtime runtime = Runtime.getRuntime();
    c += "Available Processors: " + runtime.availableProcessors() + CR;
    c += "Memory Max: " + runtime.maxMemory() + CR;
    c += "Memory Total: " + runtime.totalMemory() + CR;
    c += "Memory Free: " + runtime.freeMemory() + CR;
    c += "Java Vendor: " + getSystemProperty("java.vendor") + CR;
    c += "Java Version: " + getSystemProperty("java.version") + CR;
    c += "Java Library Path: " + CR + getSystemProperty("java.library.path") + CR;
    c += "Project Class Path: " + CR + getClassPath(project) + CR;
    return c;
}

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From source file:org.apache.axiom.attachments.impl.PartFactory.java

/**
 * This method checks the configured threshold and
 * the current runtime information.  If it appears that we could
 * run out of memory, the threshold is reduced.
 * //  w w w . j  a  v a2 s .co m
 * This method allows the user to request a much larger threshold without 
 * fear of running out of memory.  Using a larger in memory threshold generally 
 * results in better throughput.
 * 
 * @param configThreshold
 * @param inflight
 * @return threshold
 */
private static int getRuntimeThreshold(int configThreshold, int inflight) {

    // Determine how much free memory is available
    Runtime r = Runtime.getRuntime();
    long totalmem = r.totalMemory();
    long maxmem = r.maxMemory();
    long freemem = r.freeMemory();

    // @REVIEW
    // If maximum is not defined...limit to 1G
    if (maxmem == java.lang.Long.MAX_VALUE) {
        maxmem = 1024 * 1024 * 1024;
    }

    long availmem = maxmem - (totalmem - freemem);

    // Now determine the dynamic threshold
    int dynamicThreshold = (int) availmem / (THRESHOLD_FACTOR * inflight);

    // If it appears that we might run out of memory with this
    // threshold, reduce the threshold size.
    if (dynamicThreshold < configThreshold) {
        if (log.isDebugEnabled()) {
            log.debug("Using Runtime Attachment File Threshold " + dynamicThreshold);
            log.debug("maxmem   = " + maxmem);
            log.debug("totalmem = " + totalmem);
            log.debug("freemem  = " + freemem);
            log.debug("availmem = " + availmem);
        }

    } else {
        dynamicThreshold = configThreshold;
        if (log.isDebugEnabled()) {
            log.debug("Using Configured Attachment File Threshold " + configThreshold);
            log.debug("maxmem   = " + maxmem);
            log.debug("totalmem = " + totalmem);
            log.debug("freemem  = " + freemem);
            log.debug("availmem = " + availmem);
        }
    }
    return dynamicThreshold;
}

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From source file:com.weibo.api.motan.util.StatsUtil.java

public static String memoryStatistic() {
    Runtime runtime = Runtime.getRuntime();

    double freeMemory = (double) runtime.freeMemory() / (1024 * 1024);
    double maxMemory = (double) runtime.maxMemory() / (1024 * 1024);
    double totalMemory = (double) runtime.totalMemory() / (1024 * 1024);
    double usedMemory = totalMemory - freeMemory;
    double percentFree = ((maxMemory - usedMemory) / maxMemory) * 100.0;

    double percentUsed = 100 - percentFree;

    DecimalFormat mbFormat = new DecimalFormat("#0.00");
    DecimalFormat percentFormat = new DecimalFormat("#0.0");

    StringBuilder sb = new StringBuilder();
    sb.append(mbFormat.format(usedMemory)).append("MB of ").append(mbFormat.format(maxMemory)).append(" MB (")
            .append(percentFormat.format(percentUsed)).append("%) used");
    return sb.toString();
}

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