[argyllcms] Re: Multithreading support
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 21 Apr 2014 17:50:53 +1000
Michael Darling wrote:
> Any thoughts of making Argyll threaded?
Hi,
well it's certainly possible - lots of things in the
profiling process are highly parallel in nature.
> It's bouncing between 12% and 13% CPU usage. 8 logical cores on my
> machine, so looks like it isn't threaded. I'm assuming the operation here
> has parallel elements to benefit from threading, but I could of course be
> wrong.
If you are talking about the B2A lookup step, then there are two parts,
setting up the acceleration structure and actually doing the inverse
lookups. I haven't really thought about what's involved in threading
the former. Threading the latter is complicated by the computation cache
- updates to the cache would have to be protected, and it might be a challenge
to make sure that this didn't become the bottleneck. Coordinating
threads could be interesting too - there would be quite different execution
times, and what do you do about grid points that depend on a cache entry that is
in the process of being computed ? - ie. how do you not end up starving
threads ? etc.
I have no plans to try and do such work though - I currently have many much
more urgent tasks.
Graeme Gill.
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