Archives
Archives
| From: | Richard Fish <bigfish@××××××××××.org> | ||
|---|---|---|---|
| To: | gentoo-user@l.g.o | ||
| Subject: | Re: [gentoo-user] Gcc 4.1 compile speed | ||
| Date: | Thu, 07 Sep 2006 04:31:01 | ||
| Message-Id: | 7573e9640609062124u100d20b4x33127cee8b2d986c@mail.gmail.com | ||
| In Reply to: | [gentoo-user] Gcc 4.1 compile speed by Mark Kirkwood |
||
| 1 | On 9/6/06, Mark Kirkwood <markir@××××××××××××.nz> wrote: |
| 2 | > After upgrading to gcc to 4.1, I notice that pure c projects take |
| 3 | > significantly longer to compile than under 3.4 (e.g. Postgres 8.1.4 - 7 |
| 4 | > minutes vs 5 minutes for -O2 optimization) |
| 5 | |
| 6 | To paraphrase from the amd64 list, It makes faster binaries slower. |
| 7 | But yeah, known issue: |
| 8 | |
| 9 | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21456 |
| 10 | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23955 |
| 11 | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687 |
| 12 | |
| 13 | Bottom line is that the optimizer makes many more passes over the code |
| 14 | now, so produces better optimizations, but it takes longer. We can |
| 15 | only hope that 4.2 begins to speed things up again. |
| 16 | |
| 17 | BTW, -O3 is meant to take a long time to compile...so it is probably |
| 18 | more useful to do your C++ comparisons at -O2. |
| 19 | |
| 20 | -Richard |
| 21 | -- |
| 22 | gentoo-user@g.o mailing list |
| Subject | Author |
|---|---|
| Re: [gentoo-user] Gcc 4.1 compile speed | Mark Kirkwood <markir@××××××××××××.nz> |