Re: VERY PECULIAR PROBLEM
On 13.03.2015 11:12, Robbie Brown wrote:
On 13/03/15 09:36, Nigel Wade wrote:
My guess, and it has to be a guess because of the total lack of
information as others have highlighted, is that your code (the *other*
code, which you don't show) "doesn't count time" because it's running in
another thread which isn't synchronized properly. The code you've shown
is a tight, CPU bound, loop so I guess the other thread is starved of
CPU cycles. Add your System.out and the tight loop becomes I/O bound,
allowing the other thread to gain CPU cycles.
All complete conjecture based on a complete lack of information.
This sounds highly plausible.
CPU starvation is not so likely on modern hardware and OS. I think it
more plausible that, since writing to the stream is missing (which is
synchronized!), there is no memory barrier and updates on non volatile
variables in the measurement thread are not visible to whatever other
thread tries to get at the timing measurement.
OP why don't you paste-bin your code and let the boffins (and us that
are less than perfect) have a look.
Amen. There is really far too little information.
Cheer
robert
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