lkml.org 
[lkml]   [2007]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: A little coding style nugget of joy
> This is a terrible assumption in general (i.e. if filesize % blocksize 
> is close to uniformly distributed). If you remove one byte and the data
> is stored with blocksize B, then you either save zero bytes with
> probability 1-1/B or you save B bytes with probability 1/B. The
> expected number of bytes saved is B*1/B=1. Since expectation is linear,
> if you remove x bytes, the expected number of bytes saved is x (even if
> there is more than one byte removed per file).

You didn't calculate the probability of actually saving a full block
or not (that's the only thing that matters). I assumed it's relatively
small and can be ignored in practice since the amount of end white
space is negligible compared to total file size.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-19 23:33    [W:0.225 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site