| 1 |
PaulNM wrote: |
| 2 |
> Hey folks, |
| 3 |
[...] |
| 4 |
> I've also seen some mentions of -j9 by people with dual core systems |
| 5 |
> elsewhere, indicating it drastically speed up some emerges. |
| 6 |
|
| 7 |
...and drastically slow down others? |
| 8 |
|
| 9 |
> So this leaves me with several possibilities. There's -j3 (current |
| 10 |
> setting), -j5, -j (no limit), -j9, or some other random number. Any |
| 11 |
> suggestions/warnings/links would be appreciated. |
| 12 |
|
| 13 |
Compiling the kernel with -j is a popular benchmark, because it really |
| 14 |
stresses the VM/disk/CPU. And before you get your hopes up too high: the |
| 15 |
ebuilds that really take long (mozilla, openoffice, glibc, gcc) won't |
| 16 |
use your makeopts anyway. |
| 17 |
|
| 18 |
My guess; going higher than -j5 won't do much for you, there will always |
| 19 |
be a process not waiting for IO (if your disk can handle the load, that |
| 20 |
is) for each CPU. -j3 will be better for cpp compiles, which hog the CPU |
| 21 |
longer and won't have to be scheduled out like with -j5. |
| 22 |
|
| 23 |
Other factors: is this a desktop system? Do you want to actually do |
| 24 |
something with it while it compiles? How much RAM do you have? |
| 25 |
|
| 26 |
(These are rethorical questions ;-)) |
| 27 |
|
| 28 |
Regards, |
| 29 |
T. |
| 30 |
-- |
| 31 |
gentoo-amd64@g.o mailing list |
Archives