On mar, 2007-03-27 at 14:52 -0600, Federico Mena Quintero wrote:
> [/me wonders if thumbnailers are measurably faster by using mmap()
> instead of read()...]
It depends on their access pattern. If they need sequential access,
read() is better because it can do prefetching (readahead).
> [Can you have thumbnailable files that are too large to mmap() even with
> a full address space? 8 GB videos on a 32-bit box?]
Of course you can't mmap a complete 8GB file on a 32bits box, but you
can do it partially (how much at a time depends on the kernel
configuration).
Xav
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