Dual CPU: kompilace kernelu (diskuse)

Asi je nejlepší +2, protože jakmile dám -j4 a kompiluju něco biggy (čti: kdelibs, glibc, qt), tak sekanec...

“Being honest may not get you a lot of friends but it’ll always get you the right ones” ―John Lennon

10.4.2006 06:10 David Watzke | skóre: 74 | blog: Blog... | Praha
Rozbalit Rozbalit vše Re: Dual CPU: kompilace kernelu

Zkusím to taky... než odejdu do školy, tak to spustím :-)

“Being honest may not get you a lot of friends but it’ll always get you the right ones” ―John Lennon

10.4.2006 13:58 David Watzke | skóre: 74 | blog: Blog... | Praha
Rozbalit Rozbalit vše Re: Dual CPU: kompilace kernelu

AMD64 Athlon 3000+, 1GB RAM, vanilla-2.6.17-rc1. Trochu jsem upravil formátování ;-)

for N in {1..6}; do
  make clean > /dev/null
  echo "make -j$N"
  time make -j$N > /dev/null || echo Failed
done

make -j1
real    3m38.282s
user    3m14.194s
sys     0m20.321s

make -j2
real    3m34.612s
user    3m14.164s
sys     0m20.359s

make -j3
real    3m34.647s
user    3m14.276s
sys     0m20.224s

make -j4
real    3m34.463s
user    3m14.386s
sys     0m20.003s

make -j5
real    3m34.398s
user    3m14.058s
sys     0m20.280s

make -j6
real    3m34.458s
user    3m14.214s
sys     0m20.079s

“Being honest may not get you a lot of friends but it’ll always get you the right ones” ―John Lennon

Preco "real" pri -j[456] nie je suctom "user" a "sys"?

Inac moje testy tiez ukazali, ze na 2xCPU bolo najrychlejsie -j2

If you hold a Unix shell up to your ear, you can you hear the C.

10.4.2006 18:54 diverman | skóre: 32 | blog: život s tučňáčkem
Rozbalit Rozbalit vše Re: Dual CPU: kompilace kernelu

Asi jste to špatně pochopil. Pro j=4,5,6 kompilace trvala okolo 25 minut. To je real. User už je jen součtem pro oba procesory.

deb http://ftp.cz.debian.org/debian jessie main contrib non-free

Mám ještě zajímavější výsledek, jeden procesor, bez HT. Nechápu :-)

make -j1
real    5m11.228s
user    4m28.177s
sys     0m29.662s

make -j2
real    5m6.803s
user    4m29.181s
sys     0m29.166s

make -j3
real    5m6.027s
user    4m29.525s
sys     0m28.850s

make -j4
real    5m6.636s
user    4m29.157s
sys     0m29.338s

make -j5
real    5m6.910s
user    4m29.673s
sys     0m28.754s

make -j6
real    4m59.729s
user    4m27.581s
sys     0m28.742s

„There is no dark side of the Moon really… as a matter of fact it's all dark.“