Re: SMP buildworld times / performance tests

[Peter Wemm]

Matthew Dillon wrote:
> 
> :> time make -j 20 buildworld build FreeBSD-current using 4.0 kernel
> :> 
> :>     4745.607u 1673.646s 1:29:07.45 120.0%   1323+1599k 8237+251565io 1615p
    f+0w
> :> 
> :> time make -j 20 buildworld build FreeBSD-current using 5.0 kernel
> :> 
> :>     4696.987u 1502.278s 1:10:34.17 146.4%   1359+1641k 10889+4270io 1779pf
    +0w
> :
> :Can I ask why is there a huge difference in the number of io (251k vs 4k)?
> :What is so different between 4.0 and 5.0 that causes this?
> 
>     That is very odd.  I'm using the same make.conf on both machines
>     but even if they weren't the same 19 minutes should not make that sort
>     of difference in I/O statistics.

One other possibility.. was the state of /usr/obj the same?  make world
does a lot less IO and is generally a fair bit quicker if /usr/obj is empty
from the start.

Just a thought...

Cheers,
-Peter



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