Re: Unidentified subject!

[Jeffrey Walton <noloader@gmail.com>]

On Sun, Feb 11, 2024 at 9:52 AM Thomas Schmitt <scdbackup@gmx.net> wrote:
>
> David Christensen wrote:
> > Concurrency:
> > threads throughput
> > 8       205+198+180+195+205+184+184+189=1,540 MB/s
>
> There remains the question how to join these streams without losing speed
> in order to produce a single checksum. (Or one would have to divide the
> target into 8 areas which get checked separately.)

Hash Tree or Merkle Tree. They are used in blockchains.

> Does this 8 thread generator cause any problems with the usability of
> the rest of the system ? Sluggish program behavior or so ?
>
> The main reason to have my own low-quality implementation of a random
> stream was that /dev/urandom was too slow for 12x speed (= 1.8 MB/s) CD-RW
> media and that higher random quality still put too much load on a
> single-core 600 MHz Pentium system. That was nearly 25 years ago.

Jeff