Mail Archives: cygwin/2003/08/27/21:36:19
Rich,
First off, if you're willing to forgo the ability to access UNC paths from
Cygwin, you can set your Cygdrive prefix to '//' to address the drives in
the same way you did in your old GNU toolset (see
<http://cygwin.com/ml/cygwin/2003-05/msg00825.html>).
Secondly, why not use Cygwin perl? This way you automatically get
the cygdrive prefix that Cygwin is configured with.
Igor
On Wed, 27 Aug 2003, Rich Elberger wrote:
> This is starting to sound promising. I hope others have similar
> experiences.
>
> Unfortunately I cannot just take make and the cyg dll. The problem comes
> in with how different utils interpret drive paths:
>
> our old gnu: //c/...
> perl: c:/...
> cyg: /cygdrive/c/... (we mount NFS exports, hence the drive notation)...
>
> So, we basically need to move things from the inside out rather than start
> patching things on the outside of the system, eventually getting to the
> core. This makes the migration pretty expensive, so I would like to see
> more cases before making the resource justification case. If it's a set
> of production machines, no problem, but the change would have to occur on
> all development workstations.
>
> I highly appreciate everyone's help because I think this is the only forum
> I could ever get such kind of feedback.
>
> -- rich
>
> On Wed, 27 Aug 2003, Rolf Campbell wrote:
>
> > make -j does work in cygwin, to an extent. If you try to use too many
> > processes, cygwin seems to flip out. -j20 does seem to work fine though
> > (it only starts acting strang around -j100).
> >
> > On my large build system, we have a slow disk, and I find that when the
> > disk cache is empty, -j4 speeds it up about 40%. When the build system
> > is cached, -j slows things down by a few percent. This is dealing with
> > 1 processor. Of course, if you have multiple processors, the speed
> > should scale linearly (with 4 cpu's, -j4 is about 70% faster).
> >
> > Rich Elberger wrote:
> >
> > > Hi folks,
> > > Currently our build environment uses parallel make (-j jobs option) on all
> > > our unixes using gnu tools. We use an older version of gnu tools on our
> > > windows boxes. The older make on the windows box does not do parallel
> > > make (or at least correctly). I want to upgrade to the latest cygwin to
> > > see if parallel make works, but this will require significant changes to
> > > our build engine, so I would like to confirm a few things if possible.
> > >
> > > 1. Does the -j jobs option work well on windows. (part b: does it work
> > > with the MSVC (6/7) compiler (which probably doesn't make a difference
> > > anyway)?
> > > 2. Has anyone done this in a very large project, and if so, do you have
> > > any performance gain stats (which, I acknowledge, is tied to
> > > processor-intensive makes and how many processors the machine has).
> > >
> > > I realize that dos does not allow for threading so I don't know if this is
> > > a cmd.exe-related issue or not (since cmd.exe is the parent shell, I
> > > don't know if this affects the behavior).
> > >
> > > thanks in advance --
--
http://cs.nyu.edu/~pechtcha/
|\ _,,,---,,_ pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`' -. ;-;;,_ igor AT watson DOT ibm DOT com
|,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D.
'---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow!
"I have since come to realize that being between your mentor and his route
to the bathroom is a major career booster." -- Patrick Naughton
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