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

[Frank Warmerdam]

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.

Best regards,
-- 
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