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Use these options to configure your JVM. The options prefixed with -X are nonstandard. Options that relate to the JIT are listed under JIT and AOT command-line options. Options that relate to the Garbage Collector are listed under Garbage Collector command-line options.
JVM(Java Virtual Machine) acts as a run-time engine to run Java applications. JVM is the one that actually calls the main method present in a java code. JVM is a part of JRE(Java Runtime Environment). Java applications are called WORA (Write Once Run Anywhere).
This is where the JVM comes in, it takes the bytecode and then turns it into machine code that the computer can execute. So you need a JVM to run the bytecode produced by a java compiler, although you don't have to specifically have one installed.
To update JVM options manually for an MSI installation: jvmoptions file. For an MSI distribution the file is located in the %programdata%\JetBrains\YouTrack\conf directory. Edit the JVM options directly in the file.
Each thread in a Java application has its own stack. The stack is used to hold return addresses, function/method call arguments, etc. So if a thread tends to process large structures via recursive algorithms, it may need a large stack for all those return addresses and such. With the Sun JVM, you can set that size via that parameter.
It indeed sets the stack size on a JVM.
You should touch it in either of these two situations:
The latter usually comes when your Xss is set too large - then you need to balance it (testing!)
Each thread has a stack which used for local variables and internal values. The stack size limits how deep your calls can be. Generally this is not something you need to change.
If I am not mistaken, this is what tells the JVM how much successive calls it will accept before issuing a StackOverflowError. Not something you wish to change generally.
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