FW: Re: [PyKDE] PyQt Installation Problems

gvermeul at labs.polycnrs-gre.fr gvermeul at labs.polycnrs-gre.fr
Wed Nov 21 21:46:51 GMT 2001

I fully agree with the observation that C++ compilations are CPU bound.

PyQt can be build in parallel makes if you make all the sipXXXVersion.h
first. So:

(cd qt; make sipqtVersion.h)
(cd qtgl; make sipqtglVersion.h)
.. for all other subdirectories
and finally:
make -j2

Works great!

I think that even normal C compilations are CPU bound, it is just
that g++ is very slow (MSVC is much faster for C++ compilations,
though the link step is much slower).

IMHO, 256 Mbyte is more than enough (128 Mbyte is sometimes a bottleneck).

I also tweak my hard drives for optimal speed, mostly for psychological
reasons. Disk caching in Linux is very good, so in my experience a
faster hard drive is barely noticable.

Best regards -- Gerard Vermeulen.

> -----FW:
> <Pine.NEB.4.40.0111211309110.22625-100000 at panix2.panix.com>-----
> Date: Wed, 21 Nov 2001 13:29:43 -0500 (EST)
> From: Donovan Rebbechi <elflord at panix.com>
> To: Jim Bublitz <jbublitz at nwinternet.com>
> Subject: Re: [PyKDE] PyQt Installation Problems
> Cc: pykde at mats.gmd.de
> [ forward to the list if you like, I can't post ]
> On Wed, 21 Nov 2001, Jim Bublitz wrote:
> > the compile). So, tip: install the qt-devel rpm along with a new
> qt
> > install and if possible uninstall the old qt version. If you
>    ...
> > 2. PyQt likes recent versions of  automake, autoconf and libtool.
> I
> > upgraded the machine to autoconf2.13, automake2.52 and
> > libtool1.4.2. Don't know if that made any difference, but those
> > work. Those may not be the latest versions - I don't have the URLs
> > for them handy, but I believe they're on the GNU site, or search
> > on Google.
> In fact if one wants to do *any* serious compiling on their machine,
> the -devel packages associated with all the installed libs are
> essential, not optional. And build software like make, autoconf,
> automake and libtool needs to be up to date.
> Taking some common sense precautions up-front can save a lot of
> wasted effort tracking down build failures.
> > 4. If you install a new ATA/IDE drive or distribution, be sure to
> > run hdparm and to check/set 32 bit I/O and DMA options (eg 'hdparm
> > /dev/hda' will display the current settings for hda - read the man
> > page or the Ultra-DMA Mini HowTo and be careful though). PyQt and
> > PyKDE2 are long compiles with a lot of HD activity so you want all
> > the speed you can get. Lots of memory helps too - 256MB PC133
> > are under $30 now.
> This is a controversial viewpoint, but my humble prejudice is that
> C++ translation units take so long to compile that the operation is
> not IO bound. A C++ translation unit can take a second or more to
> compile on a fairly fast CPU, and a modern machine can do *a lot* of
> IO in that time window.
> Memory certainly helps, and if you've got an SMP machine, so does
> "-j2" (though unfortunately not with PyQt. There appears to be
> something wrong with the dependencies, so parallel builds don't
> work)
> -- 
> Donovan
> --------------End of forwarded message-------------------------
> ----------------------------------
> E-Mail: Jim Bublitz <jbublitz at nwinternet.com>
> Date: 21-Nov-01
> Time: 10:55:13
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