![]() Can leave jstat running in the background and use the data at a later time without the need to monitor its progress.The following section will look at 3 different solutions for inspecting the JVM as well as pros and cons for each: There are multiple good articles on what each of the memory types mean and do, but the primary memory type we will focus on is the 'Old Gen' memory. If all of the 'max' values in the output above are added together, you will see this number. The JVM is going to take 75% of the remaining available memory which is roughly 5.6 GB (in this case). With 8 GB of RAM usually only a few hundred MBs are used by the OS. JVM Reaction Threshold set at 5.5 GB out of 5.5 GB from Tenured Generation JVM Warning Threshold set at 5.4 GB out of 5.5 GB from Tenured Generation T17:10:13 Resource decision manager establishing memory thresholds: Pool CMS Perm Gen (init=20.8 MB, used=45 MB, committed=73.2 MB, max=160 MB) Pool CMS Old Gen (init=248 MB, used=777.2 MB, committed=1.8 GB, max=5.5 GB) Pool Par Survivor Space (init=768 KB, used=0 bytes, committed=33.2 MB, max=33.2 MB) Pool Code Cache (init=2.4 MB, used=7 MB, committed=7.1 MB, max=48 MB) Lets start with looking at the mem.log for a box with 8 GB of RAM: T17:10:13 Initializing resource decision manager, detecting memory configuration: The memory utilization graph of your system will just appear to flat-line.** But what does it really do with all that memory? Hopefully by the end of this guide you will have a better idea of what goes on under that line and be able to tweak your systems to maximum efficiency.** ![]() ![]() ![]() When Nexpose starts, it takes a 75% sized chunk of the available memory. This guide is designed to show a few techniques to monitor how the Java Virtual Machine (JVM) memory is used. ![]()
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