[distcc] Scaling?
Jaan Oras
joras at itcollege.ee
Wed Feb 5 09:50:28 GMT 2003
Hi!
I just tried distcc in our school and i found out that using 14 computers
the speedup was about 6 times. Why isnt the speedup bigger? What limits it?
I could try to make some test with other number of computers(i could use up
to 50 p3`s plus 24 p4 at 1.7GHz) later, but if the limit is explained
somewhere then i will skip it :)
THE Test:
DistCC(http://distcc.samba.org) test
Computers:
13 P3 about 600MHz with 256MB RAM
1 P4 at 1.4GHz
Network:
100Mbit
Comments:
First 3 tests were made on P3 computers only
Last 2 tests were made on P4 computer as the main computer and P3 computers
as compiling servers
Test1:
Compiling Vim6.1 without distcc
real 3m27.970s
user 3m7.900s
sys 0m8.480s
Test2:
Compiling Vim6.1 with distcc on 2 machines
real 1m57.934s
user 1m46.180s
sys 0m7.420s
Test3:
Compiling Vim6.1 with distcc on 3 machines
real 1m29.412s
user 1m18.940s
sys 0m6.780s
Test3:
Compiling Vim6.1 with distcc on 5 machines
real 1m6.749s
user 0m56.930s
sys 0m7.040s
Test4:
Compiling QT Libraries without distcc
real 92m16.201s
user 90m13.190s
sys 1m44.520s
Test5:
Compiling QT Libraries with distcc on 14 machines
real 15m49.675s
user 11m25.110s
sys 0m33.010s
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