#pypy IRC log for Thursday, 2010-02-11

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pedronisfijal: ping09:29
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kenaan03david 10r7118914 pypy/lang/prolog/branch/continuation-based/prolog/interpreter/test 07M(test_callable_interface.py tool.py): extract parse method to tool module ...11:00
kenaan03david 10r7119014 pypy/lang/prolog/branch/continuation-based/prolog/interpreter 05A(test_specialized_terms.py) 07M(term.py): Add specialized classes for terms with a certain amount of arguments ...11:00
kenaan03david 10r7119114 pypy/lang/prolog/branch/continuation-based/prolog 07M(termconstruction.py helper.py test_unification.py): update stuff to accept other term classes ...11:00
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cfbolzhello11:19
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kenaan03david 10r7119314 pypy/lang/prolog/branch/continuation-based/prolog 07M(__init__.py database.py test_builtin.py): fix some database related xfailing tests ...11:20
kenaan03david 10r7119414 pypy/lang/prolog/branch/continuation-based/prolog/interpreter 07M(term.py test_unification.py): Use specialized terms for up to 3 arguments ...11:20
kenaan03david 10r7119514 07M(pypy/lang/prolog/branch/continuation-based/prolog/interpreter/term.py): remove debug message ...11:20
pedroniscfbolz: hi11:23
cfbolzhi samuele11:24
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hpkmornings11:30
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cfbolzpedronis: ping?11:48
pedroniscfbolz: pong11:57
cfbolzit seems we might need to vacate cobra11:57
cfbolzwe need to do some server reshuffling here11:58
pedronisbit of a mess buildbot wise11:58
cfbolz:-(11:58
cfbolzI feared that11:58
pedronislet me check which runs are typically on it11:59
cfbolza subset of: pypy-c-app-level-linux-x86-32, pypy-c-stackless-app-level-linux-x86-32, pypy-c-Ojit-no-jit-linux-x86-3211:59
pedronisit all weill take longer with only wyvern basically12:09
pedronis(hoping that buildbot doesn't get too confused)12:09
pedronisI mean try to schedule too much stuff12:09
cfbolzpedronis: we will get some machine back after the reshuffling12:10
pedronisok12:10
cfbolzdo you think it will be fine for the meantime?12:10
pedronishopefully yes, we'll see12:10
cfbolzok12:10
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cfbolzthe actual shutdown will only be end next week12:11
cfbolzso till then nothing bad happens12:11
pedronisI will not be much around at that time though12:13
pedronis(still at pycon)12:13
cfbolzright12:13
hpkpedronis:  could you maybe connect some machine from OE's side? 12:13
Action: cfbolz lunch12:14
pedronisonly my box maybe, all out machines are quite busy12:14
hpki just remember jacob saying that there was some extra machine for pypy planned, but that probably takes a while or so12:14
pedronis(that's why there's was the idea of getting a benchmark server)12:14
cfbolzmaybe we can schedule a bit more on bigdogvm112:14
hpkhow much RAM is needed these days? 12:15
pedronis1.5G?12:15
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xorAxAxhttp://xkcd.com/303/13:21
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fijalhi14:58
fijalpedronis: pong14:59
cfbolzhi maciek15:10
Action: fijal is a bit lost in timezones15:11
pedronisfijal: the talk you were thinking of, is it the ep2008 gc talk?15:15
fijalyop15:16
kenaan03david 10r7119814 07M(pypy/lang/prolog/branch/continuation-based/prolog/interpreter/term.py): Unify signature for special class constructor ...15:18
pedronisfijal: ok15:18
fijalcfbolz: what is davide doing?15:24
cfbolzdavid15:25
cfbolzrefactoring prolog15:25
cfbolzto be more jittable15:25
cfbolzunfortunately we are discovering limitations in the JIT15:25
fijalsuprise15:26
fijalwhich one especially?15:27
cfbolzif you have complex virtuals, then optimizefindnode has bugs15:28
cfbolzif you have any sort of aliazing, optimizefindnode gives up15:28
cfbolz(and in prolog you always have aliasing)15:28
exarkunthose sound like the good kind of limitations, that can be fixed simply by programming a bunch?15:28
cfbolzexarkun: yes, for a certain definition of "a bunch"15:29
exarkunbut the whole jit probably doesn't need to be rewritten from scratch after 3 more phd theses?15:30
cfbolzwe hope not :-)15:30
cfbolzexarkun: well, twisted seems to be a bit of a problem for a tracing JIT15:31
exarkunso I've heard15:31
cfbolz(or event loops in general)15:31
exarkunfijal said something about stack depth15:31
fijalnot precisely about stack depth15:31
cfbolzalso the fundamental assumption (a loop often follows the same path) is not true15:32
fijalbut just calling a lot of stuff15:32
fijalcfbolz: it's not fundamental too much, since we have bridges15:32
fijalno?15:32
cfbolzit still is15:32
cfbolzif you really have megamorphic call sites, you have a problem15:32
fijalok, however this is a bit less of a problem15:34
fijal(as sometimes it really does follow the same trace)15:34
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fijalbut the length of the trace is far too big15:35
pedronisbut we have things we do in that case15:36
fijalyes, except we still spend forever tracing15:36
pedronisbut it's also true that megamorphic code means more chances15:36
pedronisto get traces that are too long15:36
cfbolzalso if you have a couple of megamorphic calls in a row15:36
cfbolzyou get exponential behaviour15:37
pedronis(we also don't really merge tails)15:37
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amaury_fijal: thanks for the post on python-dev16:04
fijalamaury_: well, up to some point I'm trying to be politically correct16:05
fijalbut I'm sort of fed up by negative PR some people are doing16:05
amaury_so am I16:05
fijalI guess a link to our benchmarks of computer language shootout to this discussion would be a bit of a blow to us merge16:05
fijal(that US is 2x slower on things)16:06
fijalbecause there is an assumption somewhere in the air that US is faster or the same speed16:06
fijalit's probably fixable though16:06
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fijalamaury_: I don't want to enter my-benchmark-is-the-best pissing contest though16:08
fijalwell, even on their benchmarks we're faster on django16:10
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Action: pedronis off19:26
pedronissee you19:26
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mwhudsonhm, i can't seem to log in to wyvern or cobra any more20:37
mwhudsonoh20:37
mwhudson-p 922, right?20:37
hpkthink so20:50
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--- Fri Feb 12 201000:00

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