Permits tracing of classes as They are really loaded. By default, this option is disabled and courses are usually not traced.
Enables invoking of concurrent GC by utilizing the Program.gc() request and unloading of courses through the concurrent GC cycle. This option is disabled by default and may be enabled only together with the -XX:+UseConcMarkSweepGC selection.
The JVM takes advantage of an analogous mechanism to implement the aspect of dumping thread stacks for debugging reasons. The JVM takes advantage of CTRL_BREAK_EVENT to accomplish thread dumps.
Allows logging of compilation exercise to the file named hotspot.log in the current Doing the job directory. You may specify a different log file route and name utilizing the -XX:LogFile option.
Sets the prefetch instruction to prefetch forward of the allocation pointer. Just the Java HotSpot Server VM supports this feature. Probable values are from 0 to 3. The actual Directions at the rear of the values depend on the platform. By default, the prefetch instruction is about to 0:
Set a breakpoint when debugging the JVM to stop at the beginning of compilation of the specified method.
Only Home windows Server 2003 supports large pages. To make use of this function, the administrator will have to 1st assign additional privilege to your user who will be jogging the appliance:
In case the argument is favourable zero or adverse zero, The end result is positive zero. If the argument is infinite, The end result is constructive infinity. Should the argument is NaN, The end result is NaN.
Returns absolutely the price of a float value. If the argument is just not damaging, the argument is returned. If your argument is destructive, the negation of your argument is returned. Unique cases:
This option has a limit of two GB; best site usually, an error is generated. The most code cache measurement should not be below the Preliminary code cache measurement; see the option -XX:InitialCodeCacheSize. This option is such as -Xmaxjitcodesize.
Automobile-tunes RTM locking according to the abort ratio. This ratio is specified by -XX:RTMAbortRatio solution. If the number of aborted transactions exceeds the abort ratio, then the strategy that contains the lock are going to be deoptimized and recompiled with all locks as typical locks. This selection is disabled by default. The -XX:+UseRTMLocking choice has to be enabled.
A Observe (with any luck , short-term) concerning the Eugene San PPA for people who are seeking to utilize it and so are obtaining troubles: As of time of the entry, the eugenesan/java PPA is broken. When you have tried to use it, chances are you'll do the next to get rid of web link it and use webupd8.org's PPA technique (earlier mentioned) in its place
Specifies no matter if JFR should create a ongoing recording to disk. By default, this parameter is ready to Phony (continuous recording to disk is disabled). To empower it, set the parameter to legitimate, in addition to set defaultrecording=legitimate.
Permits the usage of the serial rubbish collector. This is mostly the only option for compact and easy applications that do not require any Distinctive features from garbage selection.