On Sat, Jan 26, 2013 at 12:06 AM, ForBode <cab...@yahoo.com> wrote:
> Andrea, thank you so very much.
> It has been hectic trying to sort through what to turn on and off for
> raster data. In addition to that my background is not in image processing
> at all. The article you posted was enlightening. The results:
>
> The GeoTiff that rendered faster did indeed have overviews.
>
> The GeoTiff that locked up the CPU did NOT.
>
> I turned off all caching (I'd rather not use it) and loaded the corrected
> GeoTiffs (I used Gdal) and it's blazingly fast now on my Mac Pro. I will be
> trying it on my Computer 2 (Server) later and hope to see even better
> results.
>
> So my question is.... should I even bother with caching? It doesn't seem
> that it would improve performance. In fact, on my Computer 3 (production at
> site) disk thrashing seems to kill tomcat. I hope that with this new
> GeoTiff and no caching it will remedy the thrashing. After all, I'd rather
> use more CPU, in this case, than disk.
>
Hum... good question. Generally speaking caching helps more maps based on
vector data than on raster data,
but still, I have seen speedup factors or 5-10 times even on raster data.
However, I've seen them on Linux machines running directly on the hardware
(no VM), it may be that
on your server this does not apply
Cheers
Andrea
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