On a different machine - G5 IMac 1.5 Gbyte ram with your definitions
fn fmt r
Name Time Space
------ ----- -----
coord0 1.000 1.380
coord1 1.446 1.000
version ''
Binary: j601binc_darwin_powerpc
Library: j601libc
Help: j601hlpc
Engine: j601/2006-11-17/17:05
ProductName: Mac OS X
ProductVersion: 10.4.8
BuildVersion: 8L127
java version "1.5.0_06" Java(TM) 2 Runtime Environment, Standard
Edition (build 1.5.0_06-112) Java HotSpot(TM) Client VM (build
1.5.0_06-64, mixed mode, sharing)
At 23:48 -0500 2007/01/29, Dan Bron wrote:
> Is there any chance the sample data you used was pushing your
machine into swap?
I doubt it. I have 2.5GB of physical memory, and watching taskman
during the execution showed that memory wasn't the bottleneck (i.e.
memory was far from pinned).
What's odd is that I have a dual core CPU, and both cores showed
activity (~60% each). Isn't J single threaded? If so, then how
come both "CPUs" showed activity? Maybe the OS was using both to
shift memory around?
In any case, my results are also repeatable. Just to be sure, I
shut down every process except J and taskman and re-ran the tests a
few times. So, the differences are real; I don't know what could
cause them.
Let's try to calibrate. First, let us know what environment you're
running under. Mine is:
OS: Windows XP Professional v 2002, Service Pack 2
CPU: Pentium 4, 3.20 GHz/3.19 GHz (dual core)
RAM: 2.50 GB
J: j601/2006-11-17/17:05 (601c) using jconsole -jprofile
So, if you haven't already, download and install J 6.01c. Then,
shut down every process you can, and run jconsole -jprofile .
In that console, run the following lines, which are the same as
before, except that I've replaced ? with ?. so that our dataset
will be the same.
9!:12''
6
9!:14''
j601/2006-11-17/17:05
coord0 =: $ #: I.@,
coord1 =: ;@:(i.@:}:@:$ ,.&.> <@I.)
b =: ?.@:$&2
ts =: 6!:2 , 7!:2@:]
fmt =: [: ,.&:>/ [: }.@:, (<4 1 $ ' ') ,. (;:'Name
Time Space') ,&.> '-' ,&.> [: <@:>"1@:|: [ ,. '0.3d' 8!:0 ] %"1
<./@:]
M =: b 1000 10 10 100
r =: 20 ts&> ' M' , L:0~ fn =. coord0`coord1
fn fmt r
Name Time Space
------ ----- -----
coord0 1.512 1.380
coord1 1.000 1.000
-Dan
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