linux-kernel - Re: Dhrystone -- userland version

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Message-ID: <Y7pRw47hidw+s6+g@mit.edu>
Date:   Sun, 8 Jan 2023 00:16:51 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        geert+renesas@...der.be, Andrew Morton <akpm@...l.org>
Subject: Re: Dhrystone -- userland version

On Sat, Jan 07, 2023 at 11:30:15PM +0100, Pavel Machek wrote:
> 
> Distributions do not usually carry dhrystone, and I don't think anyone
> really maintains it. It is useful tool, and it seems we'll maintain
> it.
> 
> I'd like to add enough glue so that it would be runnable from
> userspace, too? Userland version is what is actually useful to me, and
> it should not be hard.

I don't see whatever message you were replying to, and it doesn't seem
to be archived in lore[1], so I'm not sure about the context.  But you
are talking about the Dhrystone benchmark[2], right?

[1] https://lore.kernel.org/all/Y7nyd4hPeXsdiibH@duo.ucw.cz/T/#u
[2] https://wiki.cdot.senecacollege.ca/wiki/Dhrystone_howto

If so, I'm confused what you mean by "add enough glue so that it would
be runnable from userspace" --- Dhrystone is a userspace benchmark,
dating from the 1980's, although what it benchmarks is often more about
the compiler than the CPU's performace.

   "When first released, the Dhrystone benchmark fulfilled a useful
   function – at least it gave an alternative indicator to vendors’
   literal MIPS ratings. However, more than twenty years later, there
   are undoubtedly better benchmarks available for measuring processor
   performance."

						- Ted