Xref: news2.mv.net comp.os.msdos.djgpp:8438
From: mlkessle AT cip DOT physik DOT uni-wuerzburg DOT de (Manuel Kessler)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: P5 Profiling
Date: 9 Sep 1996 12:32:20 GMT
Organization: CipPool der Physikalischen Institute, Uni Wuerzburg
Lines: 41
Message-ID: <5112ok$fsi@winx03.informatik.uni-wuerzburg.de>
References: <199609061759 DOT KAA07125 AT bluesky DOT com>
NNTP-Posting-Host: wpax02.physik.uni-wuerzburg.de
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp



Kevin Baca (kbaca AT skygames DOT com) wrote:
: Yesterday I asked if anyone was interested in seeing the code I use 
: to profile programs on Pentium machines.  I got a few replies, so 
: here it is.
: 
: Note:  The opcodes used in the macros below (RDMSR and WRMSR) will 
: generate a General Protection Fault (GPF) unless they are executed at 
: ring 0.  They run fine under Win95 DOS shells, but under plain DOS 
: you need to use a DPMI provider that allows your program to run in 
: ring 0.  CWSDPMI does NOT allow your program to run in ring 0, but 
: CWSDPR0 does.  Look at my batch file below to see how to tell your 
: program to use CWSDPR0.  Be aware that CWSDPR0 does not support 
: virtual memory.  I haven't tried this stuff under any other DPMIs 
: except Win95 and CWSDPR0.  I'd be interested to know if it works
: under others (i.e. QEMM and Windows NT).

[SNIP]
I made some patches for CWSDPMI (the ring 3 DPMI provider) to support the
RDMSR/WRMSR/RDTSC instructions. So you get the best of both: virtual memory
support AND profiling capabilities. The downside is, you have to run CWSDPMI in
a HIMEM-only environment, no V86-managers like EMM386 etc. But its fine for me,
because i'm currently working on pentium optimized BLAS, so i need virtual
memory and profiling. If anyone is interested, feel free to email me, so i can
mail you the sources OR visit my homepage, but not before tomorrow, as i don't
have the patches at hand.

Special hint to Charles W. Sandman: is it possible or worth to get this into 
the next release of CWSDPMI, at least as a compile-time option? And, of course,
many thanks for this great piece of code!

Ciao,
	Manuel

-- 
Manuel Kessler
Graduate Student at University of Wuerzburg, Germany, Physics Department
SNAIL: Zeppelinstrasse 5, 97074 Wuerzburg, Germany
EMAIL: mlkessle AT cip DOT physik DOT uni-wuerzburg DOT de
WWW: http://www.cip.physik.uni-wuerzburg.de/~mlkessle