[hashcash] Re: parallel hashcash proof of concept
- From: Hubert Chan <hubert@xxxxxxxxx>
- To: hashcash@xxxxxxxxxxxxx
- Date: Thu, 17 Mar 2005 12:45:31 -0500
>>>>> "Hal" == "Hal Finney" <hal@xxxxxxxxxx> writes:
[...]
Hal> Unfortunately there wasn't much difference. Maybe a tiny increase
Hal> in speed. But of course hashcash creation times are so variable,
Hal> even doing 100 coins the time varies by maybe 50%. So it's really
Hal> hard to tell if it is helping at all.
Thanks for your tests.
It's not really surprising. Both processes are doing similar things,
and are numeric-intensive, which apparently hyperthreading doesn't seem
to work well with.
Hal> I did a little research then and it seems that most hyperthreading
Hal> benchmarks show similar results of only a few percent increase at
Hal> best. I have to say that this CPU technology is more hype than
Hal> hyper.
I try to avoid the hype. ;-)
I think it all depends on the type of application you're running. If
both processes are numeric-intensive (or are doing the exact same
thing), I guess hyperthreading won't help, since you're still only using
one core. If your processes are doing vastly different things, like in
a typical office app or game, hyperthreading is probably more of a
winner. I don't think hashcash is, or ever will be, an application that
can take advantage of hyperthreading, since it just does a whole bunch
of integer calculations.
--
Hubert Chan <hubert@xxxxxxxxx> - http://www.uhoreg.ca/
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