I got similar numbers with single-line ZIP compressed 2K EXRs - actually
a little better than that.
Clearly there are many factors that will affect the improvement observed.
On 03/21/2013 05:51 AM, Al Crate wrote:
Just tried out image player with uncompressed 16-half rgba 2K exr's
and it's about 15% faster.
This is obviously a very rough value.
On 20/03/13 16:17, Al Crate wrote:
Hiya Piotr ... small world eh?!
Nope pulling from iif-optimisations branch, I'll check and see if we've
missed out the sse2 compiler flags or something.
On 20/03/13 15:51, Piotr Stanczyk wrote:
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: openexr-devel-bounces+pstanczyk=ilm....@nongnu.org
[openexr-devel-bounces+pstanczyk=ilm....@nongnu.org] on behalf of Al
Crate [a...@dneg.com]
Sent: 20 March 2013 03:32
To: openexr-devel@nongnu.org
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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