On Thu, Nov 18, 2010 at 4:59 PM, Richard Guenther
<richard.guent...@gmail.com> wrote:
> On Thu, Nov 18, 2010 at 4:41 PM, Michael Matz <m...@suse.de> wrote:
>> Hi,
>>
>> On Thu, 18 Nov 2010, Jeff Law wrote:
>>
>>> > I think that it should still be the case that if you break Java, and
>>> > one of the Java testers catches you, you still have an obligation to
>>> > fix the problem. All we're changing is whether you build Java by
>>> > default; nothing else.
>>>
>>> Agreed. I'd really like to see java removed from the default languages;
>>> I just don't see the cost vs benefit justifies keeping java in the
>>> default languages.
>>
>> I'd like to reiterate a request from the summit that is related to the
>> default languages discussion: Add Ada to the default languages in exchange
>> for java+libjava. It builds nicely parallel (and fairly quick), doesn't
>> have a ghastly large runtime library, and tests a huge number of
>> middle-end paths taken by no other language.
>>
>> At the summit not many people were in favor of that, but I can't think of
>> any logical reason for that.
>>
>> (Of course it would be only added to the default languages if a host Ada
>> compiler is already pre-existing. I.e. we wouldn't add more
>> requirements.)
>
> Some numbers (12 threads machine, make -j12):
>
> Bootstrap on x86_64, all languages, multilibs not disabled (but a tree
> w/o libquadmath)
>
> 11910.45user 345.06system 26:05.82elapsed 782%CPU (0avgtext+0avgdata
> 2797888maxresident)k
> 378176inputs+26582792outputs (1768major+237834772minor)pagefaults 0swaps
>
> Same, w/o Java (but a tree w/ libquadmath):
>
> 7906.15user 260.27system 16:04.65elapsed 846%CPU (0avgtext+0avgdata
> 1238864maxresident)k
> 251808inputs+16966856outputs (1719major+178250323minor)pagefaults 0swaps
>
> Same, w/o Java and w/o Ada (also w/ libquadmath):
>
> 5963.16user 200.42system 12:07.44elapsed 847%CPU (0avgtext+0avgdata
> 1238864maxresident)k
> 992inputs+14262344outputs (0major+145323512minor)pagefaults 0swaps
Of course a roundtrip is still dominated by testing, for a tree w/o Java
and w/o Ada we have (multilib testing, {,-m32}):
15510.72user 2312.78system 34:56.02elapsed 850%CPU (0avgtext+0avgdata
6539456maxresident)k
141984inputs+25827288outputs (121major+1685085397minor)pagefaults 0swaps
Richard.
