Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Message-ID:	<3A7A25FF.2A2BDB7@nc.rr.com>
Date:	Thu, 01 Feb 2001 22:14:07 -0500
From:	Greg Smith <gsmith AT nc DOT rr DOT com>
X-Mailer:	Mozilla 4.76 [en] (WinNT; U)
X-Accept-Language:	en
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Some basic questions

Hi,

I'm a minor developer for an open source project called Hercules which emulates
IBM mainframe architecture under linux (http://www.conmicro.cx/hercules/).
Some enterprising souls have gotten the program to work under windows32 by
utilizing cygwin.  I must admit, I'm impressed with the performance of the program
running on my NT 4.0 sp6 dual pIII 256M system...

q1) The program obtains the emulated storage in a single malloc().  Under linux,
     we allow the size to range up to 256M, but under cygwin, the most storage
     we can malloc at a single time is 96M.  Is there some way we can adjust this limit ?
     By the same token, we seem to get malloc() failures a lot sooner than we do
     under linux; I am pretty sure the total amount of space we've tried to obtain is
     under 256M; again, is this some limit we can bypass ?

q2) What is the state of pthreads under cygwin ?  (The emulator is heavily multi-threaded).
     Currently we are using an implementation of pthreads from
     ftp://sources.redhat.com/pub/pthreads-win32, and using the snapshot from August 13
     (later instances seem to require a dll that I haven't been successful in creating).

q3) I am having a difficult time debugging the multi-threaded program both under
     cygwin and linux (Redhat 7.0 + the 2.4 kernel and associated requisites).  I
     assume my problems under cygwin is due to using a foreign pthreads implementation ?
     I would also be extremely grateful if some kind person could direct me to
     some instructions for debugging under linux, too.  By the way, the cygwin debugger
     is impressive, is there a linux equivalent too ?  (Afraid my ignorance is showing
     here, I'm actually a mainframer type myself).

q4) One reason I upgraded to linux kernel 2.4 is that the program works, in my
     personal experience, 20% faster under cygwin than under linux.  Even with the
     new kernel, I can not recoup the performance difference.  Does anyone have
     a plausible explanation ?

This is my first post to the list, and I've only been a member for 15 min ;-), so if
I've overstepped some boundaries then I'm sure some of you will let me know...

Thanks,

Greg Smith
gsmith at nc dot rr dot com


--
Want to unsubscribe from this list?
Check out: http://cygwin.com/ml/#unsubscribe-simple

- Raw text -