Re: [Openexr-devel] iif-optimisations branch tests

[Piotr Stanczyk]

Hey Al, 

Are you grabbing code from the develop branch? 
There should be a input file method :

    //---------------------------------------------------------------
    // Check if SSE optimization is enabled
    //
    // Call after setFrameBuffer() to query whether optimized file decoding
    // is available - decode times will be faster if returns true
    //
    // Optimization depends on:
    //   the file type (only scanline data is supported),
    //   the framebuffer channels (RGB/RGBA mono or stereo)
    //   the framebuffer channel types (all channels half-float format only)
    //   the file channels (RGB/RGBA mono or stereo)
    //   the file channel types (all channel half-float format only)
    //   whether SSE2 instruction support was detected at compile time
    //
    // Calling isOptimizationEnabled before setFrameBuffer will throw an 
exception
    //
    //---------------------------------------------------------------

isOptimizationEnabled

Can you run that and let me know what you are seeing?
The read times should indeed be mostly dominated by the (de)compressor 
workload. However, on my machine here I saw something in the region of 10-15% 
improvement.
Are you able to try this on an uncompressed file? You should see quite a 
significant speed up there. 

Let me know if that is not the case and we can look into this further.

________________________________________
From: address@hidden address@hidden on behalf of Al Crate address@hidden
Sent: 20 March 2013 03:32
To: address@hidden
Subject: [Openexr-devel] iif-optimisations branch tests

Hi all,

Just built the iff-optimised version, I tweaked the code in IlmImfTest
to spit out some timings between the aligned and unaligned tests.

The timings are almost identical, which isn't what I'd expect, is there
anything I should be doing here to make this work, I also tried using
the optimised libraries in our playback tool and that showed little to
no speed improvements.

I'm guessing I'm not using these correctly, is there some compiler
option I require or memory alignment needed?

cheers

al


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