Re: maximum theoretical speedup with dual quad processors
Re: maximum theoretical speedup with dual quad processors
- Subject: Re: maximum theoretical speedup with dual quad processors
- From: Peter Duniho <email@hidden>
- Date: Mon, 2 Feb 2009 20:30:53 -0800
On Feb 1, 2009, at 8:37 PM, Michael Ash wrote:
Thanks to both you and Rob for repeating the experiment. Interesting
that it's so variable. On my computer it would occasionally require
several million to crash, but most of the time it explodes within the
first few hundred thousand.
I've been testing your code too. The first time I ran it, it crashed
after 1,150,000 operations had been added. But the second time, more
than two hours and 40 million operations later, it was still running
fine. I've had a couple more attempts where it went well over 1
million without problem.
I'm going to keep trying, but it looks very hard to reproduce on my
system (MacBook Pro Core 2 Duo 2.33Ghz, Leopard 10.5.6).
Just for clarification, what kind of "explode" happens on your
computer (and the other respondents, if they have that information)?
On my computer, the one time I saw it crash, it was an
NSInvalidArgumentException, complaining that in "-[MyOperation start]"
the "receiver has already started or finished". I'm wondering if this
is the exception everyone sees, or if the actual exception varies from
one execution of the program to the next.
If the problem is difficult to reproduce on some computers, knowing
the exact failure could greatly help Apple track the problem down.
Pete
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