RE: Java's poor performance

All - Everyone here, should get a copy of this book from O'Reilly.

Java Performance Tuning

By Jack Shirazi
September 2000
ISBN: 0-596-00015-4

Best regards, Kelly Smith

-----Original Message-----
From: tini-admin-6tN4nzCoH/[email protected] [mailto:tini-admin-6tN4nzCoH/[email protected]]On Behalf Of
Fred
Sent: Sunday, April 25, 2004 6:25 PM
To: tini-6tN4nzCoH/[email protected]
Subject: [TINI]Java's poor performance




Hi all,

I am completing a university project about Java in embedded systems.  I have
developed a realtime data acquisition system in Java (but I had to do the
deterministic scheduling using a native ISR).
I am very curious to know why exactly Java takes so long to do even simple
things like assigning the values in an array.  I know it's only an 8-bit
microcontroller and this means that the bytecode translates into more
machine instructions than on a PC.  But this is the same with C!!!
The difference in execution times is huge.   The interpreter overhead
shouldn't be as much as it seems to be.  I would have thought an interpreter
simply needs to translate the bytecode into machine code at run-time.

Why is Java so slow?
Is it because Java interpreters are very inefficient and hence translate the
bytecode into many machine instructions?
...or is is because of the garbage collector which keeps interrupting?
...or is it because there are many instances of the interpreter sharing the
cpu?

Thanks in advance to all you coffee-sipping geeks  ;-)

Fred

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