Sets the action measurement (in bytes) for sequential prefetch instructions. Append the letter k or K to indicate kilobytes, m or M to point megabytes, g or G to indicate gigabytes. By default, the action sizing is ready to 16 bytes:
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Apps embedding the JVM routinely must entice signals such as SIGINT or SIGTERM, which can cause interference Using the JVM signal handlers.
Sets the number of interpreted process invocations just before compilation. By default, during the server JVM, the JIT compiler performs ten,000 interpreted process invocations to assemble details for productive compilation.
Disables the system that allows instruments attach to your JVM. By default, this selection is disabled, which means the attach system is enabled and you will use diagnostics and troubleshooting equipment like jcmd, jstack, jmap, and jinfo.
Sets the period of time (in milliseconds) a softly reachable item is kept Lively within the heap once the final time it was referenced. The default worth is just one second of lifetime for every free of charge megabyte while in the heap. The -XX:SoftRefLRUPolicyMSPerMB selection accepts integer values symbolizing milliseconds for every a single megabyte of the useful content present heap measurement (for Java HotSpot Shopper VM) or the maximum attainable heap dimensions (for Java HotSpot Server VM).
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If enabled, will save jstat binary data if the Java application exits. This binary data is saved within a file named hsperfdata_pid, in which pid is the next page method identifier with the Java software that you ran. Use thejstat command to display the general performance facts contained Within this file as follows:
The flags have now been produced out of date, and their use generates a warning. In the foreseeable future release these flags will likely be removed absolutely.
Windows: The following illustration demonstrates how the -XX:OnError possibility image source can be utilized to run the userdump.exe utility to acquire a crash dump in the event of an irrecoverable error (the %p designates the current procedure).
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Specifies the identify of the class for being introduced. Command-line entries subsequent classname are the arguments for the leading system.
-XX:SharedArchiveConfigFile=shared_config_file The option is accustomed to specify more shared knowledge extra into the archive file. In JDK nine, it supports strings and symbols. The string info and symbol facts need to be generated by the jcmd Resource attaching to some managing JVM procedure. See jcmd.