On 2 Jan 2011, at 03:29, Sunil S Nandihalli wrote:
can I force the JIT to be called immediately for certain pieces of
code after it starts executing with out waiting for the JVM realize
it is necessary....? I would not mind jitting the whole code ..
Actually I don't mind waiting a few extra seconds at the start since
actual run-time for the program could be a couple of hundred
minutes...
Is startup time the only reason why the whole code is not jitted
immediately.. ?
No. JIT compilation is based on run-time profiles of the code, so it
requires information that is not available before starting the
program. To given an example, if a method is called frequently with a
specific argument type, a specialized version can be compiled.
In terms of total runtime there wouldn't be much to gain anyway from
compiling upfront. All you'd gain is a more uniform cost of function
calls. But why care unless you need real-time performance - and then
you shouldn't be using a JVM language anyway.
Konrad.
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