xception: Java VM debugging flags

<body><script type="text/javascript"> function setAttributeOnload(object, attribute, val) { if(window.addEventListener) { window.addEventListener('load', function(){ object[attribute] = val; }, false); } else { window.attachEvent('onload', function(){ object[attribute] = val; }); } } </script> <div id="navbar-iframe-container"></div> <script type="text/javascript" src="https://apis.google.com/js/platform.js"></script> <script type="text/javascript"> gapi.load("gapi.iframes:gapi.iframes.style.bubble", function() { if (gapi.iframes && gapi.iframes.getContext) { gapi.iframes.getContext().openChild({ url: 'https://www.blogger.com/navbar.g?targetBlogID\x3d11356004\x26blogName\x3dxception\x26publishMode\x3dPUBLISH_MODE_BLOGSPOT\x26navbarType\x3dBLUE\x26layoutType\x3dCLASSIC\x26searchRoot\x3dhttps://openrent.blogspot.com/search\x26blogLocale\x3den_US\x26v\x3d2\x26homepageUrl\x3dhttp://openrent.blogspot.com/\x26vt\x3d-4655156434419967503', where: document.getElementById("navbar-iframe-container"), id: "navbar-iframe", messageHandlersFilter: gapi.iframes.CROSS_ORIGIN_IFRAMES_FILTER, messageHandlers: { 'blogger-ping': function() {} } }); } }); </script>

Java VM debugging flags

If you want to see what's going on inside a JVM, use these flags at a minimum:
-XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+PrintHeapAtGC -verbose:gc -Xloggc:/path/to/logfile/gc.log

You can also add these options to obtain data from the JVM:

-XX:+PrintHeapUsageOverTime Print heap usage and capacity with timestamps
-XX:+PrintGCApplicationStoppedTime Measure the length of the collection pauses.
-XX:+PrintTLAB Trace all the operations on TLAB's (Thread Allocation Buffers)
-XX:+PrintGCApplicationConcurrentTime Measure the amount of time the applications runs between collection pauses
-XX:+PrintTenuringDistribution Gives the aging distribution of the allocated objects in the young generation.
-XX:+TLABStats
-XX:+PrintGCTaskTimeStamps