Hi Richard,
Sorry to reply so late about this thread but I was away for few weeks.
> I'm trying to make my transform go fast. I've got a 1920x1080
> RGB image being transformed from sRGB to the display profile.
Ok, sounds very similar to what I have to do in my application.
(I also had to manage
Am 13.05.2013 23:17, schrieb Bob Friesenhahn:
> Are you sharing the same transform (created by one thread), or are you
> creating an independent transform for each thread (ideally created by the
> thread which uses it)? Creating the transform can consume considerable time
> so it can be useful
On 14/05/2013 09:20, Richard Hughes wrote:
> Other than profiling, how do we know if it's chosen a built-in version
> rather than the generic version?
I initially used profiling, but then I added some code to capture what
transforms were used. This is also on the same branch I pointed you at
bef
On Tue, 14 May 2013, Richard Hughes wrote:
>
>> Are you sharing the same transform (created by one thread), or are you
>> creating an independent transform for each thread (ideally created by the
>> thread which uses it)?
>
> One transform shared between threads. I can try to create multiple
> tran
On 14 May 2013 00:32, Robin Watts wrote:
> Before you dive into the complexities of multithreading etc, it would
> seem sensible to ensure you are getting the best possible performance
> out of the transform routine in the first place.
Makes sense.
> LCMS has various different transform routines
On 14 May 2013 09:12, Richard Hughes wrote:
> On 13 May 2013 22:17, Bob Friesenhahn wrote:
>> What specific CPU are you using?
>
> I'm profiling on Intel i7 M620 @ 2.67GHz
That's only a two-core CPU, I think, though each core can have two
threads. You may or may not get much benefit from hyperth
On 13 May 2013 22:17, Bob Friesenhahn wrote:
> What specific CPU are you using?
I'm profiling on Intel i7 M620 @ 2.67GHz
> It would be good to share the ICC profile you are using for testing since it
> can make a difference. If lcms is only doing indexed lookups for the
> profile, then memory a
On 13/05/2013 22:01, Richard Hughes wrote:
> I'm trying to make my transform go fast. I've got a 1920x1080 RGB
> image being transformed from sRGB to the display profile. I've got a
> quad core processor on my development box, no shaders or GPU, and I'm
> trying to do the transform as quickly as po
On Mon, 13 May 2013, Richard Hughes wrote:
>
> I figured 4 threads should be ~4x faster than using 1 thread (in the
> second case we should only have 4 threads, so not much overhead), but
> no matter the value of max_threads or 'n' I can only achieve a ~1.9x
> speed-up. I've tried with and without
Hi all,
I'm trying to make my transform go fast. I've got a 1920x1080 RGB
image being transformed from sRGB to the display profile. I've got a
quad core processor on my development box, no shaders or GPU, and I'm
trying to do the transform as quickly as possible.
I figured the fastest way to do t
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