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Re: PATCH RFA: Do not build java by default
On Thu, Nov 18, 2010 at 4:41 PM, Michael Matz <matz@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
thus, enabling Java makes CPU time increase by 50% while
disabling Ada reduces CPU time by only 25%.
Richard.