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Re: Speed does matter [message #91780 is a reply to message #91774]

Tue, 25 August 2015 14:35

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 8/25/15 7:03 AM, Kallisthène wrote:
> Le mardi 25 août 2015 10:32:22 UTC+2, superchromix a écrit :
>> Nice comparison. On my desktop, running IDL 8.5 and Matlab 2010b,
>> I get the following results:
>>
>> IDL: % Time elapsed: 6.4400001 seconds.
>>
>> MATLAB 2010b: Elapsed time is 0.594112 seconds.
>>
>> Again, MATLAB for loops run faster by a factor of ~10.
>
> Great idea,
>
>
> I ran also these codes, with bigger numbers, 1000 instead of 500 for
> each dimension and with Matlab 2015a I got 6.3 secondes to compare
> with 102 secondes on my IDL 8.5. My desktop runs 4 cores and has 12
> Go RAM and it runs faster with Matlab by a factor of 16 ! Damn.
>

For what it's worth, I got about a 5x speedup of IDL over Python. I used
1000 elements for each dimension:

$ python mg_loopspeed.py
222.15 secs

Code is:

import numpy as np
import time

nx = 1000
ny = 1000
nz = 1000

arr = np.zeros((nx, ny, nz))

tic = time.clock()

for z in xrange(nz):
for y in xrange(ny):
for x in xrange(nx):
arr[x, y, z] = 1.0

toc = time.clock()
print '%0.2f secs' % (toc - tic)

For comparison, my IDL time:

$ idl -e ".run mg_loopspeed"
IDL Version 8.5, Mac OS X (darwin x86_64 m64).
(c) 2015, Exelis Visual Information Solutions, Inc., a subsidiary of
Harris Corporation.

% Compiled module: $MAIN$.
% Compiled module: TIC.
Elapsed Time: 47.486635

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)

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[Message index]

		Re: Speed does matter By: Kallisthène on Thu, 04 October 2012 06:24
		Re: Speed does matter By: Kallisthène on Thu, 13 August 2015 00:31
		Re: Speed does matter By: Kallisthène on Thu, 13 August 2015 00:33
		Re: Speed does matter By: chris_torrence@NOSPAM on Thu, 13 August 2015 14:19
		Re: Speed does matter By: Kallisthène on Fri, 14 August 2015 05:16
		Re: Speed does matter By: chris_torrence@NOSPAM on Thu, 20 August 2015 10:47
		Re: Speed does matter By: Kallisthène on Fri, 21 August 2015 01:09
		Re: Speed does matter By: Dae-Kyu Shin on Mon, 24 August 2015 21:34
		Re: Speed does matter By: markb77 on Tue, 25 August 2015 01:32
		Re: Speed does matter By: Kallisthène on Tue, 25 August 2015 06:03
		Re: Speed does matter By: Michael Galloy on Tue, 25 August 2015 14:35
		Re: Speed does matter By: Kallisthène on Wed, 26 August 2015 01:41
		Re: Speed does matter By: Kallisthène on Thu, 03 September 2015 00:47
		Re: Speed does matter By: Kallisthène on Mon, 17 October 2016 00:17
		Re: Speed does matter By: wlandsman on Mon, 17 October 2016 11:34
		Re: Speed does matter By: Markus Schmassmann on Tue, 18 October 2016 03:35
		Re: Speed does matter By: chris_torrence@NOSPAM on Thu, 13 August 2015 14:21
		Re: Speed does matter By: Kallisthène on Fri, 14 August 2015 04:59

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