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[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO
- From: "hubicka at ucw dot cz" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 12 May 2012 18:32:14 +0000
- Subject: [Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO
- Auto-submitted: auto-generated
- References: <bug-45375-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375
--- Comment #132 from Jan Hubicka <hubicka at ucw dot cz> 2012-05-12 18:32:14 UTC ---
> > tree VRP : 65.88 ( 2%) usr 0.73 ( 2%) sys 66.71
> >( 2%) wall 862879 kB (24%) ggc
>
> Is it possible to do this again with gathering statistics enabled? The
I started it some time ago, but it takes a while (it runs out of RAM even
on my machine ;)
> only thing I can think of for this would be ASSERT_EXPRs and all the
> rewriting involved for them.
It also might be folding doing too much of temporary stuff.
> > tree slp vectorization : 25.42 ( 1%) usr 0.16 ( 0%) sys 25.50
> > ( 1%) wall 436119 kB (12%) ggc
>
> This 12% also seems excessive.
Indeed it is.
> > integrated RA : 191.13 ( 7%) usr 0.44 ( 1%) sys 190.64
> > ( 7%) wall 2328880 kB (65%) ggc
>
> Uh, wow! :-(
Tep, sems something degenerate here. IRA is usually not that big of memory
hog.
Honza