("\nTotal Memory: " + total / mb + "MB") Public static void printUsage(Runtime runtime) Returns the total amount of swap space in bytes. Returns the total amount of physical memory in bytes. Returns the "recent cpu usage" for the whole system. Returns the CPU time used by the process on which the Java virtual machine is running in nanoseconds. Returns the "recent cpu usage" for the Java Virtual Machine process. Returns the amount of free swap space in bytes. Returns the amount of free physical memory in bytes. Returns the amount of virtual memory that is guaranteed to be available to the running process in bytes, or -1 if this operation is not supported. In JDK 1.7, you can get system CPU and memory usage via. it's been reported that getSystemLoadAverage() returns -1 on Windows).Īlthough originally licensed under GPL, it has been changed to Apache 2.0, which can generally be used for closed source, commercial products. Also, some JMX functionality may not be available to all platforms (i.e. The getSystemLoadAverage() and disk space querying methods are only available under Java 6. For disk space, File.getTotalSpace() and File.getUsableSpace().For memory, OperatingSystemMXBean.getTotalPhysicalMemorySize() and OperatingSystemMXBean.getFreePhysicalMemorySize().
For CPU usage, OperatingSystemMXBean.getSystemLoadAverage() / OperatingSystemMXBean.getAvailableProcessors() (load average per cpu).For my GPL projects, I will definitely consider SIGAR in the future.įor my current needs, I'm leaning towards the following: It's possible that Hyperic may license SIGAR for commercial use, but I haven't looked into it. However, due it being licensed under the GPL, I cannot use it for my original purpose (a closed source, commercial product). 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.
To clarify, I would like to get the current CPU usage for the whole system, not just the Java process(es). 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).
Although these are viable options, I would prefer not to maintain OS-specific code myself if someone already has a better solution. 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. *Note that I mean overall memory available to the whole system, not just the JVM. I would like to monitor the following system information in Java:
0 kommentar(er)
