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From: Robert Dewar <dewar@gnat.com>
Subject: Ada and OS/2
Date: 1999/10/24
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Date: 1999-10-24T00:00:00+00:00
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In article <slrn815aue.1oe.aidan@skinner.demon.co.uk>,
  aidan@skinner.demon.co.uk wrote:
> I've heard really good things about HPFS, is it the OS design
> or the file system itself that's doing it?

Well the high performance version is HPFS386, which is what I
use, and it seems to have far more effective caching
capabilities than competitive systems on Linux or NT.

The new file system in the latest versions of OS/2 is a
compeltely new journaling file system, which is supposed
to be still faster, but I have not yet tried this.

I must say that I find OS/2 to be an excellent platform for
Ada development, certainly far better than NT, I am not enough
of a Unix expert to fairly judge Linux as an alternative.

The one measurement I gave is an interesting one, which is
linking the whole of the GNAT compiler (i.e. gnat1). This
used to take about 50 seconds on my note book using 286 HPFS,
and that seems comparable (given the speed of my machine)
with what you see on NT or Linux, but using 386 HPFS, the
link takes about 7 seconds, apparently because of the very
effective caching of object files. Fast linking is always
welcome :-)

Anyway, if you do want to give OS/2 a try, as I noted in a
previous post, we will soon have a version of 3.12p for OS/2.
It is indeed already prepared, and we are just doing some
basic sanity checks on it this weekend before posting it.

It's nice to know there are some fellow OS/2 Ada users out
there, and as I have said before, you can expect better
support for OS/2 GNAT in the future (we actually have two
OS/2 enthusiasts at Ada Core Technologies :-)

Robert Dewar
Ada Core Technologies


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