Allows logging of compilation activity to a file named hotspot.log in The present Performing Listing. You could specify a distinct log file route and identify utilizing the -XX:LogFile alternative.
Logging can be managed at operate time by way of Diagnostic Commands (With all the jcmd utility). Anything that can be specified about the command line will also be specified dynamically Using the VM.
Sets a tailor made command or possibly a series of semicolon-separated instructions to run when an irrecoverable mistake happens. In case the string consists of spaces, then it needs to be enclosed in quotation marks.
Lower Java heap measurement by decreasing the values of your parameters MaxHeapFreeRatio (default price is 70%) and MinHeapFreeRatio (default benefit is 40%) With all the command-line alternatives -XX:MaxHeapFreeRatio and -XX:MinHeapFreeRatio. Reducing MaxHeapFreeRatio to as low as ten% and MinHeapFreeRatio to 5% has successfully decreased the heap dimensions devoid of too much functionality regression; nevertheless, outcomes could fluctuate tremendously dependant upon your software.
Sets the percentage in the heap to work with because the minimal with the young generation sizing. The default value is five % of your Java heap.
Home windows: If the option -agentlib:foo is specified, then the JVM tries to load the library named foo.dll in the location specified by The trail system variable.
Instructs to not print the compile instructions. By default, the commands which my sources you specify with the -XX:CompileCommand choice are printed; by way of example, if you exclude from compilation browse around this site the indexOf() approach to the String class, then the subsequent is printed to plain output:
Use the subsequent commands and Innovative runtime options to obtain decreased reaction occasions for the software:
Notice that PrintGCApplicationConcurrentTime and PrintGCApplicationStoppedTime are logged on precisely the same tag and aren’t divided in the new logging.
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When current at run time, --illegal-entry= usually takes a key phrase parameter to specify a method of operation:
Messages tagged with gc, meta, andclass aren’t be logged asclass* is about to off. The default configuration for all other messages at stage warning is in impact aside from People which include class.
Logs messages tagged with the gc tag utilizing the trace amount into a rotating file set with 5 documents with dimension one MB with the base title gctrace.txt and uses decorations uptimemillis and pid.
Permits GC in the younger generation right before Each individual comprehensive GC. This selection is enabled by default. Oracle endorses that you choose to don’t disable it, due to the fact scavenging the young generation in advance of an entire GC can lower the volume of objects reachable from your old era space in to the younger technology Place.