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POHow do I monitor the computer's CPU, memory, and disk usage in Java?
 

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  1. POHow do I monitor the computer's CPU, memory, and disk usage in Java?
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    <p>I would like to monitor the following system information in Java:</p> <ul> <li>Current CPU usage** (percent)</li> <li>Available memory* (free/total)</li> <li><p>Available disk space (free/total)</p> <p>*Note that I mean overall memory available to the whole system, not just the JVM.</p></li> </ul> <p>I'm looking for a cross-platform solution (Linux, Mac, and Windows) that doesn't rely on my own code calling external programs or using JNI. Although these are viable options, I would prefer not to maintain OS-specific code myself if someone already has a better solution.</p> <p>If there's a free library out there that does this in a reliable, cross-platform manner, that would be great (even if it makes external calls or uses native code itself).</p> <p>Any suggestions are much appreciated.</p> <p>To clarify, I would like to get the current CPU usage for the whole system, not just the Java process(es).</p> <p>The SIGAR API provides all the functionality I'm looking for in one package, so it's the best answer to my question so far. However, due it being licensed under the GPL, I cannot use it for my original purpose (a closed source, commercial product). It's possible that Hyperic may license SIGAR for commercial use, but I haven't looked into it. For my GPL projects, I will definitely consider SIGAR in the future.</p> <p>For my current needs, I'm leaning towards the following:</p> <ul> <li>For CPU usage, <code>OperatingSystemMXBean.getSystemLoadAverage() / OperatingSystemMXBean.getAvailableProcessors()</code> (load average per cpu)</li> <li>For memory, <code>OperatingSystemMXBean.getTotalPhysicalMemorySize()</code> and <code>OperatingSystemMXBean.getFreePhysicalMemorySize()</code></li> <li>For disk space, <code>File.getTotalSpace()</code> and <code>File.getUsableSpace()</code></li> </ul> <p>Limitations:</p> <p>The <code>getSystemLoadAverage()</code> and disk space querying methods are only available under Java 6. Also, some JMX functionality may not be available to all platforms (i.e. it's been reported that <code>getSystemLoadAverage()</code> returns -1 on Windows).</p> <p>Although originally licensed under GPL, it <a href="http://forums.hyperic.com/jiveforums/thread.jspa?threadID=11426&amp;tstart=0" rel="noreferrer">has been changed</a> to <a href="http://support.hyperic.com/display/SIGAR/Home#Home-license" rel="noreferrer">Apache 2.0</a>, which can generally be used for closed source, commercial products.</p>
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    1. USDavid Crow
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    1. COTo clarify, the sigar api gets you system info. If you want jvm info use JMX.
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      1. POHow do I monitor the computer's CPU, memory, and disk usage in Java?
      1. USMatt Cummings
    2. COSIGAR being under the GPL does not preclude you from using it, it just means you have to contact the authors and request alternate licensing. Authors are often happy to accept a small fee and allow commercial licensing.
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    3. COSince version 1.6.4 SIGAR is using the Apache license.
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