Re: Should we remove java from the default bootstrap languages?

[Laurent GUERBY <laurent at guerby dot net>]

On Sat, 2008-06-21 at 21:03 +0200, Arnaud Charlet wrote:
> > Without Ada (=all) bootstrap gets down to 1h54 at -j1 so Ada is 0h24, or
> > 17% of =all, without Ada and Java (=c,c++,fortran,objc) it gets down to
> > 1h17 at -j1 so java is 0h37 or 27% of =all.
> 
> Note that I recently made the ada build parallel on trunk, so these figures
> should be very different on trunk, since now building e.g. libada is
> much faster with -jxx and will give a significant speed up.

More data on make bootstrap times:

baseline: gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
trunk revision 137004 Sat Jun 21 19:20:06 UTC 2008

-j4 =c
4671.57user 231.40system 22:37.84elapsed 361%CPU

ï-j4 =c,c++
5432.07user 293.57system 26:43.52elapsed 357%CPU

-j4 =c,ada
6819.21user 304.12system 32:08.14elapsed 369%CPU

-j4 =c,java (,c++ implied)
8909.32user 471.50system 45:33.95elapsed 343%CPU

So about estimated 1h59 for =c,ada at -j1 vs 1h22 for =c
and around 90% of expected speedup with or without Ada (according to
user+system vs elapsed). Ada cost of 0h37, +45% vs =c.

On the two 8 barcelona 2.2 GHz cores machine donated by AMD
to the GCC compile farm I measured:

-j8 =c
4115.01user 177.29system 12:50.72elapsed 556%CPU 

-j8 =c,fortran
4379.00user 205.48system 12:34.10elapsed 607%CPU 
(see below)
ï
-j8 =c,c++
4632.48user 213.45system 14:04.17elapsed 574%CPU

-j8 =c,ada
5805.12user 227.32system 16:57.56elapsed 592%CPU 

ï-j8 =c,java (,c++ implied)
7845.79user 348.71system 23:45.03elapsed 575%CPU 

I noticed insn-attrtab compilation is about 5mn20s and probably
explain about all of the not so perfect speedup: when I look at top it
takes more than 1 minute per stage finishing alone. I've seen it up to 3
minutes alone. There's a comment in the Makefile about trying to
compile it earlier but it doesn't seem to work all the time
(likely reason behind c,fortran faster than =c)

Is there a plan to cut this one?

Laurent