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Re: baseline performance test using java ...

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On 7/2/2011 3:45 PM, lbrt chx _ gemale kom wrote:
> ~ I have searched to no avail for some kind of hardware baseline
> performance test for a piece of code. ~ Notice that I don't mean to
> "profile" code, with "baseline" I mean that the actual performance of
> an algorithm should me gauged against its  underlying hardware and
> OS, like its I/O subsystem (RAM (types, speed, amount), file access,
> ...)

As far as I know, performance should be measured relatively.  That is, I 
run some code on my system, then make changes and run it again.  I 
measure the speed up or slow down.

Then I compare that to the first time.  It's relative speed increase 
that matters.  Speed on your system doesn't mean much to me.


> ~ We have all learned we should avoid String(s) and use
> StringBuffer(s) or better yet StringBuilder(s) but there is


Er, no.  Strings are great.  They are immutable.  This can give HUGE 
performance gains when dealing with multi-threaded code and such like 
(for example, lambda expressions).



> java -version>  version.txt java -verbose:class
> -XX:+PrintGCTimeStamps -XX:+PrintGCDetails code class.txt 2>&1

No sure I follow the GC related stuffs.  Is garbage collection somehow 
related to running speed?

As for the rest of it, I'm not really convinced a general methodology or 
set of parameters could be produced.  Too many variables.  The devil in 
the details, and since code is little else but details, by substitution 
we can establish that in fact Satan is loose in your system.

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baseline performance test using java ... lbrt chx _ gemale kom - 2011-07-02 22:45 +0000
  Re: baseline performance test using java ... markspace <-@.> - 2011-07-02 16:00 -0700
  Re: baseline performance test using java ... Patricia Shanahan <pats@acm.org> - 2011-07-02 16:50 -0700

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