On Sun, Mar 29, 2020 at 10:30:39AM -0500, Bruce Dubbs via blfs-dev wrote:
> On 3/29/20 10:13 AM, Ken Moffat via blfs-dev wrote:
> > On Sat, Mar 28, 2020 at 12:48:38AM +0100, Uwe Düffert via blfs-dev wrote:
> >
> > (changing the subject)
> > >
> > > Is there any special reason we would want to upgrade llvm but not rustc?
> > > Both are rather ugly packages with pretty long pretty similar build times,
> > > but recent rustc versions are available way longer than the recent llvm
> > > one.
> > > I'd even expect rustc to be easier to upgrade due to fewer stuff to test!?
> > >
> >
> > When I built rustc 1.40.0, 1.41.0 and 1.41.1 I used all 8 cores. It
> > seemed to me that the install phase was taking a long time, but I
> > didn't think too much about that.
> >
> > For the book, we want timings with 4 cores, so I took the siblings
> > offline. A manual ./x.py build took just under 56 minutes. I then
> > started the (DESTDIR) install - on 1.39.0 the other day, that took 8
> > minutes and I was surprised at how quick it seemed. With 1.42.0
> > that took over 57 minutes (longer than the 'build'). Total is 65
> > SBU, and the tests took 17 SBU.
> >
> > The build of 1.42.0 using system llvm was smaller than 1.39.0 with
> > its shipped llvm. Oh, and while all of the build, install and test
> > were running (for measuring, I do tests afterwards, to see how the
> > space changes) from time to time the desktop was unusable, e.g. lost
> > a few characters when typing a mail.
>
> Did you log the install? Is it doing a complete rebuild? What happens if
> we just did
>
> DESTDIR=${PWD}/install python3 ./x.py install
>
> without the build. I know that the tests would not be run until after the
> install. Also, do we need --exclude src/tools/miri on the install line?
>
> -- Bruce
Hi Bruce,
I did log it, but after discovering it had been swapping, finally
grokking Pierre's comment re the grep and then killing everything
unnecessary on that box it is now rerunning the build.
Interesting ideas. I'll try to test all of them.
Thanks.
ĸen
--
When alle is ſayed and all is done, ye must chooſe your faces wisely,
for soon enouff ye will be playing with fyre."
The Nice and Accurate Prophecies of Agnes Nutter, Prophecy 5004
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