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why need different jvm implementation?

 
kumar Reddy
Greenhorn
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hi
i have a small question

j2sdk1.4 comes with a default implementation of jvm?

but there exists many implemntations of jvm from different vendors such as IBM J9 VM?

i would just like to know why is it like this..why dont we use the default vm provided by sun?

when should we use the JVM'S from other vendors?

thank you
 
Ernest Friedman-Hill
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Given that there is Windows, why do we need other OSs?

Given the ix86 architecture, why do we need PowerPC or Sparc?

Given that Ford makes the Escort, why do we need Kia or Lexus or Hummer?

Pepsi, Pepsi, no Coke!
 
Jeroen Wenting
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Originally posted by Ernest Friedman-Hill:

Given that Ford makes the Escort, why do we need Kia or Lexus or Hummer?


I've often wondered about that, especially Kia and Lexus

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Manufacturers make JVMs optimised for their specific needs and desires.
Someone might want one that has a smaller memory footprint and doesn't need some things the default one has.
Another might want more security as standard and is willing to sacrifice performance for that.
Etc. etc.
 
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