Disabling hotspot/optimisations

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nobrow - 16 May 2006 17:43 GMT

Is it possible to disable runtime optimisations (inlining, compilation,
and whatever else goes on) on modern *sun* JVMs (>= 1.4)? -classic has
been gone since 1.4 so how does one disable hotspot these days? -Xint
isnt quite the same thing ... is it?

Thanks.

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Thomas Hawtin - 16 May 2006 17:41 GMT

> Is it possible to disable runtime optimisations (inlining, compilation,
> and whatever else goes on) on modern *sun* JVMs (>= 1.4)? -classic has
> been gone since 1.4 so how does one disable hotspot these days? -Xint
> isnt quite the same thing ... is it?

-classic made the JRE use the old JIT compiler instead of one of the new
adaptive compilers. -Xint makes the JRE not use any compilers. Modern
JREs don't have ye olde JIT compiler, so you can't have that.

There are numerous tuning options. Inlining can be switched off
altogether with -XX:-Inline. If you don't want compilation, then -Xint.
-client forces the less aggressive compiler (the default on most machines).

What are you trying to achieve?

Tom Hawtin

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Unemployed English Java programmer
http://jroller.com/page/tackline/

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nobrow - 17 May 2006 08:38 GMT

> > Is it possible to disable runtime optimisations (inlining, compilation,
> > and whatever else goes on) on modern *sun* JVMs (>= 1.4)? -classic has
[quoted text clipped - 15 lines]
> Unemployed English Java programmer
> http://jroller.com/page/tackline/

Now why didnt that come up during googling? ... A full list is at
http://java.sun.com/docs/hotspot/VMOptions.html

Thanks Tom!

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Disabling hotspot/optimisations

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