From: Michael Erdmann <boavista@berlin.snafu.de>
Subject: Re: Ada for OS/2 (was Re: Linux faster than OS/2...)
Date: 1997/07/06
Date: 1997-07-06T00:00:00+00:00 [thread overview]
Message-ID: <33BFD446.205A@berlin.snafu.de> (raw)
In-Reply-To: dewar.868154088@merv
Robert Dewar wrote:
>
> Michael said
>
> <<I have done this today. It seems now to work a bit faster.>>
>
> That's not very convincing :-)
> Did you actually measure the difference.
> I tried the -pipe and it made no difference at all to the
> compilation speed of several examples I tried.
I have repeated the measurement. The difference is not measurable,
what happend was more simple. I did increase my ram cache from
1.5M to 2M and this caused most of the enhancement in the speed.
>
> But a lot depends on your setup. In my setup, I have 80 megs and never
> swap, so in fact disk IO is completely overlapped (I tried an interesting
> experiment which was to put
>
> sources, objects, temp files, ali files
>
> for the library all in a RAM disk, and compile the library. It took,
> within measurable accuracy EXACTLY the same time as using a disk with
> the normal HPFS cache.
>
I dont have 80 MB, but i allready thought about installing a ram disk
for the same purpose.
> That's why I don't think -pipe will help. If you have a decent amount
> of RAM and a 2 meg cache, then the temporary files get written to the
> cache, and read from the cache. Sure, they get written to disk as well,
> but these are lazy writes from the cache which can be completely
> overlapped with computation.
I agree on this and i am not going to install any ramsdisk.
By the way i have redone some measurement based upon a software package
called rudstone. I did take the sources from the 1995 Ada CDROM from
Walnut Creek and done the same measurements:
Compilation+Build Execution
OS/2 150 sec 97
Linux 135 sec 114
Compiling is slower in OS/2 but the execution time for the benchmark
is smaler, meaning better performance.
What i understood so far, i have to accept some performance degrade
for the compilation in favor of the OS/2 features, but the performance
of programms is not automaticaly less good then with Linux.
As a result i decided to stay with OS/2 instead of switching to Linux.
Michael
next prev parent reply other threads:[~1997-07-06 0:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5ovqj1$4ul$1@unlisys.unlisys.net>
[not found] ` <5p06jo$c1r$2@elektron.et.tudelft.nl>
[not found] ` <5p38a7$2df$2@unlisys.unlisys.net>
[not found] ` <5p93ov$9ro@news.mr.net>
[not found] ` <5p9tpm$e90$1@unlisys.unlisys.net>
1997-07-01 0:00 ` Ada for OS/2 (was Re: Linux faster than OS/2...) system
1997-07-02 0:00 ` Robert Dewar
1997-07-02 0:00 ` system
1997-07-02 0:00 ` Robert Dewar
1997-07-02 0:00 ` Ralph Paul
1997-07-02 0:00 ` Robert Dewar
1997-07-03 0:00 ` Matthieu Willm
1997-07-02 0:00 ` Jerry van Dijk
1997-07-05 0:00 ` Michael Erdmann
1997-07-03 0:00 ` Geert Bosch
1997-07-04 0:00 ` Haug Buerger
1997-07-04 0:00 ` Robert Dewar
1997-08-18 0:00 ` Ada for OS/2 Geert Bosch
1997-08-19 0:00 ` Tarjei T. Jensen
1997-08-19 0:00 ` Robert Dewar
[not found] ` <33BEBF5C.367F@berlin.snafu.de>
1997-07-05 0:00 ` Ada for OS/2 (was Re: Linux faster than OS/2...) Robert Dewar
1997-07-06 0:00 ` Michael Erdmann [this message]
1997-07-04 0:00 ` erdmann
1997-07-04 0:00 ` Geert Bosch
1997-07-07 0:00 ` Michael Erdmann
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