Hi.
On Fri, 17 Apr 2015 12:08:31 -0700
David Christensen <dpchr...@holgerdanske.com> wrote:
> 1. I use 'shred' when I want to fill a disk or partition with random
> numbers. It is ~1.7 orders of magnitude faster than /etc/urandom.
And 'shred' uses /dev/urandom in turn:
$ strace -e trace=file shred -s 100M - > /dev/null
…
open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
open("/dev/urandom", O_RDONLY) = 3
Although, according to strace, 'shred' cheats and only reads 2k bytes
from /dev/urandom, and not 100m as 'dd' does.
Given that, no wonder that shred is faster.
> 2. Perl's Math::Random::ISAAC::XS is only slightly faster than
> /dev/urandom.
That Perl module doesn't seem to use kernel-based entropy at all. Thank
you for pointing me out at it, now I know it so I avoid it.
Reco
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