On Oct 03 09:46, Andriy Gapon wrote:
On 02/10/2017 21:34, Dan Mack wrote:
Another significant change in build times this week - not complaining,
just my observations on build times; same server doing buildworld during
the various phases of compiler changes over the last year or so FWIW:
|--------------+--------------+---------------+----------+-----------|
| Ver (svn-id) | World (mins) | Kernel (mins) | Relative | Comment |
|--------------+--------------+---------------+----------+-----------|
| 292733 | 90 | 16 | 0.5 | |
| 299948 | 89 | 16 | 0.5 | |
| 322724 | 174 | 21 | 1.0 | clang 4.x |
| 323310 | 175 | 21 | 1.0 | clang 4.x |
| 323984 | 175 | 21 | 1.0 | clang 4.x |
| 324130 | 285 | 21 | 1.6 | clang 5.x |
| 324204 | 280 | 21 | 1.6 | clang 5.x |
|--------------+--------------+---------------+----------+-----------|
It shocked me to a realize that I can build several platforms that do not have
clang support yet (like powerpc) one after another in a fraction of time
required to build just amd64.
It is insane now how long it takes on lesser powered hardware. When we
had gcc as the system compiler I could do a full buildworld/kernel in
around 3 hours. With the first version of clang that we had imported I
think it increased to around 6 hours. Clang4 made it around 8 hours. And
now clang5 it took 12 hours!
This is on an Intel Atom D525 with amd64. And I have a few things
disabled too like lib32 and profiled libraries.
--
Matt
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