[Gdal-dev] ECW compression - Extremely slow Linux performance

[Andrew Larcombe]

Frank Warmerdam wrote:
> Andrew Larcombe wrote:
>> Frank - according to top the CPU usage varies but never gets above 
>> 20%. Does this shed any more light on the issue?
> 
> Andrew,
> 
> This indicates things are stalling somewhere.  My guess then is that it
> is a thread switching issue of some sort.  How confident are you that
> you are using the latest and greatest ECW SDK?
> 
> It could also be some sort of IO problem.  I think the encoder keeps
> temp files in /tmp.  I trust that is a fast local disk too?
> 
> Beyond that it gets pretty involved to try and diagnose.   I just hate
> multithreaded libraries.

Frank,

I will check the ECW SDK on Monday and report back. Thanks for your help,

Regards,

Andrew

-- 
Andrew Larcombe
andrew at andrewlarcombe.co.uk