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What is Client VM?

 
Mallesham Karnati
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Could someone explain what is meant by Java Hotspot client VM?
When you say 'client VM', does it mean that there are server VMs?
In what way it is different from regular Java VM, i.e. java.exe ?
 
Marilyn de Queiroz
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The client VM is the default.
You can set a flag to run the VM as server. Type "java -help" to see your options.
 
Ilja Preuss
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The difference is in the type of optimizations that get performed. The client VM is faster at startup, the server VM gets faster after some time with long running processes.
 
Mallesham Karnati
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Thanks Marylin and Ilja for your quick response. What is the significance of the term 'Hotspot' in Java Hotspot Clint VM?
 
Ilja Preuss
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"HotSpot Engine" is Sun's name for the optimizer that got introduced with Java 1.2, if I remember correctly. "hotspot" is the term for a part of the code that is executed very much and therefore is important for the performance of the overall system. The "HotSpot Engine" is designed to concentrate on those hotspots for optimization purposes.

See http://java.sun.com/products/hotspot/ for more info.
 
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