[Insight-developers] fill

[M.Staring at lumc.nl]

Thanks for the confirmation
Marius

From: Bradley Lowekamp [mailto:blowekamp at mail.nih.gov]
Sent: woensdag 10 april 2013 18:07
To: Bill Lorensen
Cc: Staring, M. (LKEB); Insight Developers
Subject: Re: [Insight-developers] fill

I was able to get quite similar numbers on RH w/ gcc 4.4.7 in standard release mode:

Array size = 100, repetitions = 20000000
The elapsed time for a C++ fill_n 690000 ms.
The elapsed time for a itk.Fill   1910000 ms.
The elapsed time for a C   fill   2620000 ms.

Array size = 1000, repetitions = 2000000
The elapsed time for a C++ fill_n 460000 ms.
The elapsed time for a itk.Fill   1700000 ms.
The elapsed time for a C   fill   2520000 ms.

Array size = 10000, repetitions = 200000
The elapsed time for a C++ fill_n 420000 ms.
The elapsed time for a itk.Fill   1680000 ms.
The elapsed time for a C   fill   2510000 ms.

Array size = 100000, repetitions = 20000
The elapsed time for a C++ fill_n 570000 ms.
The elapsed time for a itk.Fill   1670000 ms.
The elapsed time for a C   fill   2510000 ms.

Array size = 1000000, repetitions = 2000
The elapsed time for a C++ fill_n 600000 ms.
The elapsed time for a itk.Fill   1680000 ms.
The elapsed time for a C   fill   2510000 ms.

Array size = 10000000, repetitions = 200
The elapsed time for a C++ fill_n 1510000 ms.
The elapsed time for a itk.Fill   1820000 ms.
The elapsed time for a C   fill   2540000 ms.

I did modify the test to set the value to 3.14, instead of 0, because other optimization may happen with a zero value...

Brad

On Apr 10, 2013, at 11:33 AM, Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>> wrote:


Or maybe Ubuntu is milliseconds and windows is seconds?

On Wed, Apr 10, 2013 at 11:28 AM, Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>> wrote:
The Ubuntu timings are much longer than windows. Was that expected?

On Wed, Apr 10, 2013 at 10:42 AM, <M.Staring at lumc.nl<mailto:M.Staring at lumc.nl>> wrote:


-----Original Message-----
From: Staring, M. (LKEB)
Sent: woensdag 10 april 2013 16:28
To: Insight Developers (insight-developers at itk.org<mailto:insight-developers at itk.org>)
Subject: FW: fill

Forgot to include the maliing list

-----Original Message-----
From: Staring, M. (LKEB)
Sent: woensdag 10 april 2013 16:24
To: 'Williams, Norman K'; blowekamp at mail.nih.gov<mailto:blowekamp at mail.nih.gov>
Cc: matt.mccormick at kitware.com<mailto:matt.mccormick at kitware.com>
Subject: RE: fill

Hi,

Attached you can find some timings for different POD types, I tested for short, int, float and double. std::fill_n is always faster, but less so for longer types.

I simply modified itk::Array::Fill to use std::fill_n instead of referring to the vnl_vector::fill which uses a simple loop over the data. Not sure if this is the way to go, but my experimental looks green:

        http://open.cdash.org/buildSummary.php?buildid=2871413

The patch I just submitted to gerrit:

        http://review.source.kitware.com/#/c/10801/

Curious to your comments,

Regards, Marius

-----Original Message-----

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