Boolean choices are used to both enable a characteristic that’s disabled by default or disable a feature that’s enabled by default. These alternatives don’t require a parameter. Boolean -XX options are enabled utilizing the moreover sign (-XX:+OptionName) and disabled utilizing the minus indicator (-XX:-OptionName).
In such cases, you'll want to enclose the arguments in quotation marks, simply because usually the shell treats the semicolon like a command finish. As an example, if you would like exclude just the indexOf(String) method of the String class from getting compiled, use the subsequent:
The subsequent case in point reveals how to set the default log file (Observe that the identifier of the process is specified as %p):
Specifies the for each-thread area buffer measurement (in bytes). Append k or K, to specify the scale in KB, or m or M to specify the dimensions in MB, g or G to specify the dimensions in GB.
Decreases the amount of entry control checks inside the verifier. By default, this selection is disabled, and it’s overlooked (that is certainly, taken care of as disabled) for courses using a the latest bytecode Variation. You are able to permit it for courses with older versions of your bytecode.
Returns the largest (closest to constructive infinity) double price that is certainly less than or equivalent into the argument and is equivalent to your mathematical integer. Distinctive circumstances:
Sets the amount of threads useful for concurrent GC. Sets threads to approximately one/4 of the number of parallel garbage selection threads. The default price is determined by the volume of CPUs available to the JVM.
Enables Java heap optimization. This sets a variety of parameters for being optimal for extensive-functioning jobs with intensive memory allocation, depending on the configuration of the pc (RAM and CPU). By default, the choice is disabled and also the heap isn’t optimized.
If the -Xlogoption and nothing else is specified over the command line, the default configuration is applied. The default configuration logs all messages with a amount that matches possibly the warning or mistake despite what tags the information is related to. The default configuration is comparable to entering the following on the command line:
If the dimensions is too substantial, then only whole garbage collections are executed, which often can acquire quite a long time to finish. Oracle suggests you retain the scale for your younger generation better than 25% and lower than fifty% of the general heap measurement. The following illustrations demonstrate how to set the First and most measurement of youthful generation to 256 MB applying different units:
Sets the length of time (in milliseconds) a softly reachable item is stored Energetic within the important link heap following the final time it absolutely was referenced. The default value is a person 2nd of lifetime for each cost-free megabyte while in the heap. The -XX:SoftRefLRUPolicyMSPerMB choice accepts integer values representing milliseconds for every one particular megabyte of the current heap dimensions (for Java HotSpot Customer VM) or the most probable heap size (for Java HotSpot Server VM).
Sets a breakpoint when debugging the JVM her response to stop at the start of compilation of the required method.
If either benefit is NaN, then The end result is NaN. Compared with the numerical comparison operators, this method considers destructive zero to be strictly smaller sized than good zero. If a blog here person argument is optimistic zero and the other negative zero, the result is optimistic zero.
Sets the maximum bytecode size (in bytes) of a technique to become inlined. Append the letter k or K to point kilobytes, m or M to point megabytes, or g or G to indicate gigabytes. By default, the most bytecode measurement is ready to 35 bytes: