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
Marti
- Original Message -
From: "Louis Solomon [SteelBytes]" <[EMAIL PROTECTED]>
To: "lcms-user"
Sent: Tuesday, May 16, 2006 2:18 PM
Subject: Re: [Lcms-user] threading
Incoming 1.16 will have more support for multithreading, though.
and what's the ETA on 1.16? 1w
Incoming 1.16 will have more support for multithreading, though.
and what's the ETA on 1.16? 1week? 1month? 6months?
Louis Solomon
www.SteelBytes.com
---
Using Tomcat but need to do more? Need to support web services, security?
Get stuff d
On 5/13/06, Marti <[EMAIL PROTECTED]> wrote:
It works fine as long as you use just one color transform per thread.
Sharing transforms between threads doesn't work because the
1-pixel cache. So you must, either, use just one tranform per thread or
inhibit the caching by using cmsFLAGS_NOTCACHE.
I
ards
Marti Maria
The littleCMS project
http://www.littlecms.com
- Original Message -
From: "Boudewijn Rempt" <[EMAIL PROTECTED]>
To:
Sent: Friday, May 12, 2006 9:06 PM
Subject: Re: [Lcms-user] threading
On Friday 12 May 2006 17:04, John Cupitt wrote:
Hello all,
I'
On Friday 12 May 2006 17:04, John Cupitt wrote:
> Hello all,
>
> I've just noticed cmsDoTransform() isn't threadsafe (when I found
> random image corruption on my SMP box, heh).
>
> Has any thought gone into making a threadsafe version? If I looked at
> this, would there be interest in patches?
Ee
On Saturday 13 May 2006 15:18, Marti wrote:
> Hi,
>
> >Eeek... I was wondering about this after I got some crashes in an
> >experimental
> > version of Krita, too, but I rather hoped it wasn't this problem.
>
> It works fine as long as you use just one color transform per thread.
> Sharing transfor
On 5/13/06, Bob Friesenhahn <[EMAIL PROTECTED]> wrote:
On Fri, 12 May 2006, John Cupitt wrote:
> I've just noticed cmsDoTransform() isn't threadsafe (when I found
> random image corruption on my SMP box, heh).
What part of the code is not thread safe? Are you sure that the
thread safety problem
On Fri, 12 May 2006, John Cupitt wrote:
I've just noticed cmsDoTransform() isn't threadsafe (when I found
random image corruption on my SMP box, heh).
What part of the code is not thread safe? Are you sure that the
thread safety problem is not a problem with your own application or
the way
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