Martin Gregorie  wrote:
> System       Real    User    Sys     CPU
> ======
> Lenovo T420   0.254s  0,252s 0.002s  1.9GHz Core i5
> Lenovo R61i   0.702s  0.693s 0.006s  1.6GHz Core Duo
> Whitebox PC   0.321s  0.314s 0.004s  1.0GHz AMC Dual Athlon
> RPI 2B       21.995s 11.496s 0.040s

Bear in mind that you're probably running a 32 bit RPi OS (on the Pi 2 you
will be), and the PCs are probably running 64 bit binaries.  That'll make a
large difference to the speed of the arithmetic for this test.

Also to note that GNU Factor can be compiled to use libgmp, which has custom
assembler implementations of key functions.  It appears the one on Ubuntu
18.04 isn't compiled that way, but that could make a large difference in
performance if different OSes are compiled different ways (as well as the
ARM v x86 comparison being different)

I don't think it's a particularly good benchmark to compare across
architectures.  And of course it's only single threaded.

> I'd been wondering whether an RP14B would be a good replacement for the
> old AMD whitebox, but it looks as if a some sort of mini-ITX system would
> be a better bet because I do all backups via rsync to a removable USB
> drive connected to the old AMD system, and to do what I need it to do, a
> replacement would need a minimum of 4 USB ports plus SATA and a VGA-
> capable display port.

That sounds like what you care about is I/O performance rather than CPU
performance.  Also bear in mind that mini ITXes are (mostly) a completely
different power class from the RPi.  Horses for courses.

Theo

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