From owner-freebsd-hackers  Thu Jul 20 17:59:39 1995
Return-Path: hackers-owner
Received: (from majordom@localhost)
          by freefall.cdrom.com (8.6.11/8.6.6) id RAA01174
          for hackers-outgoing; Thu, 20 Jul 1995 17:59:39 -0700
Received: from wdl1.wdl.loral.com (wdl1.wdl.loral.com [137.249.32.1])
          by freefall.cdrom.com (8.6.11/8.6.6) with SMTP id RAA01168
          for <hackers@freebsd.org>; Thu, 20 Jul 1995 17:59:37 -0700
Received: from miles.sso.loral.com (miles.wdl.loral.com) by wdl1.wdl.loral.com (5.x/WDL-2.4-1.0)
	id AA12095; Thu, 20 Jul 1995 17:59:01 -0700
Received: by miles.sso.loral.com (4.1/SSO-SUN-2.04)
	id AA03750; Thu, 20 Jul 95 20:59:22 EDT
Date: Thu, 20 Jul 1995 20:59:20 -0400 (EDT)
From: Richard Toren <rpt@miles.sso.loral.com>
X-Sender: rpt@miles
To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>
Cc: hackers@freebsd.org
Subject: Re: ramspeed results - ??
In-Reply-To: <199507202035.NAA09749@gndrsh.aac.dev.com>
Message-Id: <Pine.SUN.3.91.950720205408.3746B-100000@miles>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: hackers-owner@freebsd.org
Precedence: bulk

I saw that this would swap itself to death when I first inspected the 
code. I asked Poul-Henning Kamp about the malloc size and received:

>For the results to be comparable you cannot change that number.
>If you want to run it with less memory, you also need to remove the
>checksum check's later.

> >>> IF YOU CHANGE IT:  DO NOT PUBLISH YOUR NUMBERS !!! <<<

i did mention that I had only 8MB of memory. If the checksum fails, I 
don't think anything will be reported. And will the summary results 
(uSec/op) values really be comparable?

I think I will modify the block size, remove the checksum checks and see 
what I get. What order of magnitude seems reasonable?

                         ====================================================
Rip Toren               | The bad news is that C++ is not an object-oriented |
rpt@miles.sso.loral.com | programming language. .... The good news is that   |
                        | C++ supports object-oriented programming.          |
                        |    C++ Programming & Fundamental Concepts          |
                        |     by Anderson & Heinze                           |
                         ====================================================
On Thu, 20 Jul 1995, Rodney W. Grimes wrote:

> > 
> > I picked up ramspeed from this list a week ago or so. Ran it last night.
> > 1> Don't know how long it took, but it was over 90 minutes.
> 
> :-(.
> 
> > 2> iT's 486DX66, BT SCSI2 VLB controller, 8 MB memory
>                                             ^^^^^^^^^^^
> 
> That code as supplied requires at least 8MB of totally free
> and unused memory or you machine pages faults and swaps to
> death.  This means you need a machine with at least 12MB and
> usually more like 16MB to run it as supplied.
> 
> > 
> > Results -
> >  49005fb0 44.464 uS/op 2.25e+04 op/sec  0.086 mb/sec
> >  8938c0df 44.845 uS/op 2.23e+04 op/sec  0.085 mb/sec
> > 
> > What is this telling me. How does it compare? Is the 3rd a disk swap rate 
> > or something?
> 
> It is meaningless given the configuration.  All 3 result values are
> the same result just expressed in 3 different ways, they all have
> very simply mathmatical relations and given any 1 of them I can
> calculate the other 2.
> 
> Change:
> #define TESTSIZE (8192*1024)
> 
> to something like
> #define TESTSIZE (4096*1024)
> 
> And boot your system single user to run the test to maximize the
> free memory pool and to make sure that no vm page fragmentation
> has happened.
> 
> 
> 
> -- 
> Rod Grimes                                      rgrimes@gndrsh.aac.dev.com
> Accurate Automation Company                 Reliable computers for FreeBSD
>