--- Log opened Sat Nov 06 00:00:00 2010
--- Day changed Sat Nov 06 2010
00:00 < |Craig|>
https://github.com/Craig-Macomber/goFlame/blob/master/hello.go#L142
00:00 < anticw> yeah ...  needs stuff i dont have
00:00 < anticw> not sure how that plays with gccgo ...
00:00 < MaybeSo> Question for folks, would this be an idiomatic way of
extending a foreign struct (xdbc.Server)?  http://paste.pocoo.org/show/286720/
00:01 < MaybeSo> basically, trying to extend xdbc.Server to add a new
function (listForests)
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00:07 < anticw> iant: heh, got an ICE
00:07 <+iant> sigh
00:07 <+iant> can you open an issue?
00:07 < anticw> yeah ...  where should it live?
00:07 <+iant> the usual Go issues is fine
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00:13 < anticw> http://code.google.com/p/go/issues/list?thanks=1255
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00:14 <+iant> thanks
00:14 < anticw> not saying it should work/build as is ...  just not ICE
00:15 < anticw> iant: the issue is var a decl outside the file ...  how does
gccgo normally resolve those?
00:15 <+iant> ?
00:16 < anticw> ie.  var decl global in settings.go ...  and used in util.go
...  how would gccgo normally even find that?
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00:16 <+iant> I assume they are in the same package, gccgo looks at all the
source files in a package at once
00:16 < anticw> so i would need -c *.go ?
00:16 < anticw> or equiv ?
00:16 <+iant> yes
00:17 < anticw> yes, doesn't find it
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00:21 < |Craig|> wow, declaring variables that are just assigned to and used
in one spot in the next line can be way slower than in-lining them
00:22 < anticw> 6g/6l don't optimize much
00:22 < |Craig|> I can tell
00:23 < |Craig|> I found out how to do what I wanted with unsafe btw, though
it comes out a bit slower than the conditional because I have to go through a
bunch of stuff to make it work
00:23 < anticw> iant: does order matter?  i wouldn't have though so
00:23 <+iant> anticw: order does not matter
00:24 < anticw> ok ...  so i have a smaller test case ...  no ICE ...  but
it shows it not finding the global var defined elsewhere
00:24 <+iant> odd
00:25 <+iant> does it work with 6g?
00:25 < anticw> yes
00:25 <+iant> very odd
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00:25 <+iant> what is the error message?
00:27 < anticw> http://ichthyostega.pastebin.com/XZSpLS8Z
00:28 < anticw> and those missing decl's cause the ICE sometimes (not
always)
00:31 <+iant> looks like the gcc driver split up the input files for some
reason
00:31 < anticw> i think it's new ...  though oddly it built src/pkg/net ...
which does this (and others i'm sure)
00:31 <+iant> it will work if you do gccgo -o f.o f1.go f2.go
00:31 <+iant> that is, adding a -o option makes it work
00:32 <+iant> sorry, gccgo -c -o f.o f1.go f2.go
00:32 < anticw> indeed
00:32 < anticw> this is some fe input parsing weirdness then?
00:32 <+iant> OK, that needs another issue, without -o it should just use
the first filename or something
00:32 <+iant> really the gcc driver program itself
00:32 <+iant> before it gets to the compiler proper
00:32 < anticw> soooooooo....  another issue for that in the same place, or
leave you to file in in gcc-land?
00:33 <+iant> in the same place, thanks; for .c files the behaviour is
correct
00:33 <+iant> it needs to change for .go files
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00:34 <+iant> I think this broke in some merge from mainline gcc
00:36 < anticw> ok, it's there as well
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00:36 < anticw> i guess someone will tag those for you at some point
00:36 <+iant> great, thanks
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00:38 < anticw> iant: what's the highest safe level for optimization?  O2?
O3?
00:38 <+iant> those should be safe, yes
00:38 <+iant> O3 is the highest level
00:38 < anticw> -funroll-loops -O6 -filovegento
00:38 <+iant> there isn't any unsafe level, unless something is broken
00:38 <+iant> levels above O3 are accepted but they mean the same as O3
00:39 < anticw> how do i make it go up to 11?
00:39 <+iant> ha
00:39 < anticw> man, i should watch that again
00:41 < anticw> iant: if the last line lacks \n you get a weird error
00:41 <+iant> sigh
00:41 < anticw> want me to just file these and let you reject them later?
00:42 <+iant> if you are up for that, that would be great
00:42 <+iant> thanks
00:42 <+iant> clearly this needs more testing
00:42 < anticw> sure ...  i actually do use gccgo though ...  and don't
typically hit too many things
00:42 < anticw> i need to get static bins working again
00:42 < anticw> that's actually really useful for remote agents (one file is
nice for upgrades, you do a rename)
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00:48 < anticw> |Craig|: what cpu are you testing with?
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00:48 < anticw> |Craig|: with some tiny tweaks it builds to gccgo ...  i
didnt do a 6g comparison yet though
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01:02 < |Craig|> anticw: I'n back.  I've been running it under OSX on 2.66
GHz Intel Core 2 Duo
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01:05 < |Craig|> anticw: one oddity about that program is that as the data
array gets more 0s in it, it starts to run faster.  I think its because the +=
ends up adding 0 and skipping the slow mostly random'ly ordered fetch
01:06 < |Craig|> the total speed more than doubles because of it
01:06 < |Craig|> meaning that fetch is a huge portion of the execution time.
01:06 < anticw> cache misses are very slow
01:06 < |Craig|> yep
01:08 < |Craig|> unfortunately that code is pretty much cache miss
generating algothem.
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01:11 < |Craig|> maybe i'm wrong, taking out that fetch does not speed it
up.  Now I'm confused.  perhaps the saving are in the floating point pipeline when
operating on 0s
01:12 < |Craig|> optimization is a very strange thing
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01:14 < |Craig|> hum, looks like its half the fetch, and maybe half that
adding floats to 0 is really fast.  I think I'm going to stop screwing with it
01:14 < |Craig|> I don
01:15 < |Craig|> I don't feel like trying to learn how the floating point
pipeline works
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01:18 < anticw> the fetch time should be way higher than fp add
01:19 < |Craig|> I took out the changing index and just made it always 0 so
it should fetch real quick, and it ran slower
01:20 * |Craig| is confused
01:20 < |Craig|> I need to redesign all the code anyway to add features, I'm
just trying to learn whats going on
01:23 < |Craig|> anyone here tried goclipse ?
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03:20 < plexdev> http://is.gd/gLDdA by [Russ Cox] in go/src/libmach/ --
libmach: detail for darwin errors
03:20 < plexdev> http://is.gd/gLDdG by [Russ Cox] in go/src/ -- env.bash:
more quoting in case of spaces
03:20 < plexdev> http://is.gd/gLDdM by [Peter Mundy] in 2 subdirs of go/src/
-- testing: rename type Test to InternalTest
03:20 < plexdev> http://is.gd/gLDe2 by [Wei Guangjing] in go/src/pkg/net/ --
net: fix windows build
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12:18 < nsf> http://github.com/nsf/gortfm/graphs/languages
12:18 < nsf> lol, documentation generator..
12:18 < nsf> ah..  it's because of the jquery
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16:40 < Guest61971> Hi. I have a trouble googling for way(s) how to
pretty-print (possibly complex) Go variables.  Is there a way?
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17:14 < exch> Guest95927: fmt.Printf("%v", myvar) will print it's contents.
Also check out %+v and %#v for even more verbose content.  Not sure if that
qualifies as 'pretty' though.  It doesn't do indentation of nested struct fields
and what not
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19:50 < SoniaKeys> does anyone remember the recent conversation about
bufio.ReadString vs ioutil.ReadFile?
19:52 < SoniaKeys> anyway, i just found a case where bufio was faster.  i
had a 177M file i needed to read.
19:52 < SoniaKeys> i guess chaching or something made 177M an unreasonable
amount to read all at once.
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19:58 < Tv> SoniaKeys: you mean ioutil.ReadAll?
20:00 < Tv> SoniaKeys: and yes, reading 177MB into memory in a single slurp
is most likely a bad idea, for example: you'll have to wait until it's all read
before you start processing it; if you wish to process it once, you'll do two
cache passes for the whole data; etc
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20:01 < SoniaKeys> really i was using ioutil.Readfile.  it's so convenient
to just give it a file name and get back all the data.
20:02 < Tv> oh yeah, almost the same thing
20:02 < SoniaKeys> but yes, i think there is duplication on a number of
levels.
20:02 < Tv> i misread your first line as ioutil.ReadString
20:02 < Tv> my later statement still holds
20:02 < SoniaKeys> yes, no argument.
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20:27 < HollyRain> hi!  how to delete any project from
http://godashboard.appspot.com/project ?
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22:56 < zhaozhou> Is it possible to create a web server which uses the host
name to load up and run an external go script somehow, effectively creating an
automated virtual host web server?  (i.e.  i load example.tld, server loads up
example.tld.go or something, which in turn does everything the website needs)
22:58 < SirPsychoS> that would be cool - I'd start with a map[string]string
that maps subdomains to executable filenames, then use something in os.* to
execute the appropriate subprocess
22:59 < SirPsychoS> or just leave out the map and just use the domain as the
filename
23:00 < zhaozhou> But how would I communicate with the subprocess, to be
able to print to the socket?
23:00 < zhaozhou> Or, could I perhaps use something like RPC to send the
socket to the subprocess?
23:01 < SirPsychoS> call os.Pipe() before exec-ing and have the subprocess
output on stdout?
23:01 < SirPsychoS> I just found this, which could be relevant:
http://pastie.org/870720
23:03 < zhaozhou> Hmmm, fair enough (and simple enough).  I'll give it a
shot, thanks.
23:03 < SirPsychoS> no problem
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23:47 < leanid-chaika> Help me.  How to reopen/redirect stderr and stdout to
my file?
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23:52 < Tv1> leanid-chaika: http://golang.org/pkg/syscall/#Dup2
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23:53 < Tv> leanid-chaika: you kind of need to know C & unix
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23:59 < leanid-chaika> Tv1 thanks.  Tv you are right :)
--- Log closed Sun Nov 07 00:00:15 2010