In the UEC Cup last weekend, I rented a machine from Amazon EC2 to run
Erica:
High-CPU Extra Large Windows Instance (c1.xlarge) $1.16 per/hour
(High-CPU Extra Large Instance 7 GB of memory, 20 EC2 Compute Units (8
virtual cores with 2.5 EC2 Compute Units each), 1690 GB of local instance
storage, 64-bit platform)
However, according to my testing, this machine is around 1.5 times slower
than my 4-core (i7 950) PC. It is a "high-level" instance aleady but
actually very slow. A competition on equal hardware from Amazon EC2 might be
interesting, but such weak hardware might not reflect program's performance
on large simulations.
Aja
-----原始郵件-----
From: Mark Boon
Sent: Wednesday, December 07, 2011 11:13 PM
To: [email protected]
Subject: [Computer-go] Elastic Cloud
I haven't had time to concern myself with computer-Go the past years. I even
have a hard time keeping up with this list. But today I had a few hours to
kill. For work I deal a lot with the Amazon EC2 service these days. And I
noticed they're not billing us for the micro instances. We mostly use their
"large" instances anyway. It turns out for the first year Amazon doesn't
charge for a micro instance. You probably need a credit card to open an
account but then you have a free Linux instance for a year. Normally they
charge $0.02 per hour (comes down to $15 for a month full-time use) or less
when you 'reserve' usage ahead of time.
I remember a while back there was some discussion about holding a
competition on equal hardware. This may be a good and cheap, maybe even
free, way to arrange something like this.
I didn't really have a clue as to how fast these micro instances are so
while I had a little time I decided to give it a little spin. I set up a
micro instance and installed some basic packages on it, like git and make. I
downloaded Libego, compiled it (something I never managed on my Mac) and ran
its benchmark. It literally didn't take me more than 15 minutes in all from
starting the instance to running Libego. It reported 27kpps and 10kpps per
Ghz. This seems to point to a 2.66Ghz processor underneath. Not terribly
exciting, but not too bad either (hey, it's free!).
The numbers seemed a bit low. So I looked in the code and modified it so
that it did just playouts and didn't use the sampler (I didn't bother to
find out what the sampler was for) and the numbers improved a bit to 44kpps
and 16kkps per Ghz.
Next I uploaded a Java jar with the refbot I made some years back. That
recorded 27kkps for plain playouts. It does compute real liberties, not
pseudo like Libego, but that's minor.
My Mac does around 11-12 kkps per Ghz for the Java version, so that looked
fairly normal to me. I thought Libego did more like 40 kkps per Ghz, so that
surprised me a bit. Maybe others can tell me if this sounds about right for
Libego.
Anyway, I thought maybe some if you might be interested in this. I know that
not everyone would favor a competition on equal hardware, but I think it
would be an interesting alternative.
Mark Boon
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