Benchmarks of 5.4 and 6.0 on a 6-CPU host (HP Netserver LT 6000r)

[Julian Elischer]

David Landgren wrote:

> List,
>
> A while back, I mentioned that I was going to bring a six-processor 
> box (an HP Netserver LT 6000r) from 5.x to 6.0-STABLE, and someone 
> asked for some before and after benchmarks. With the recent spate of 
> advisories, I figured it was time to recompile the world, which gave 
> me the chance to perform the other side of the benchmark, to see how 
> 6.0 performs.
>
> The benchmark was of course to buildworld and buildkernel.
>
> Back in november I was running a reasonably recent 5.4-STABLE. I first 
> ran the build with -j12 to give the system a workout, and then 
> afterwards without, for the real thing. Each time I moved /usr/obj to 
> /usr/obj-old, in order to have a fresh /usr/obj directory tree created 
> each time. (In fact, I didn't have much choice in the matter: cruft 
> from 5.4 builds or something or other cause the very first make to 
> fail. Zapping /usr/obj fixed that).
>
> In all cases the machine was very lightly loaded.
>
> 5.4-STABLE compilation times
> ----------------------------
>
> # Build world, 12 processes:
> time env -i make -j12 -DALWAYS_CHECK_MAKE buildworld
>     real    43m28.093s
>     user    152m18.214s
>     sys     41m6.976s
>
> # Build word, normal:
> time env -i make -DALWAYS_CHECK_MAKE buildworld
>     real    157m46.084s
>     user    143m20.122s
>     sys     17m53.311s
>
> # Build kernel, 12 processes:
> time env -i make -j12 -DALWAYS_CHECK_MAKE buildkernel KERNCONF=PROFANE
>     real    18m30.613s
>     user    30m46.221s
>     sys     6m0.858s
>
> # Build kernel, normal:
> time env -i make -DALWAYS_CHECK_MAKE buildkernel KERNCONF=PROFANE
>     real    32m51.860s
>     user    29m53.228s
>     sys     3m30.556s
>
> 6.0-STABLE compilation times
> ----------------------------
>
> # Build world, 12 processes:
> time env -i make -j12 -DALWAYS_CHECK_MAKE buildworld
>     real    43m40.423s
>     user    155m43.345s
>     sys     30m15.898s
>
> (Of note, system time has declined by 25%)
>
> # Build word, normal:
> time env -i make -DALWAYS_CHECK_MAKE buildworld
>     real    160m28.020s
>     user    146m26.300s
>     sys     16m4.736s
>
> (No difference)
>
> # Build kernel, 12 processes:
> time env -i make -j12 -DALWAYS_CHECK_MAKE buildkernel KERNCONF=PROFANE
>     real    18m12.984s
>     user    31m31.825s
>     sys     4m26.606s
>
> (again, a clear reduction of 25%)
>
> # Build kernel, normal:
> time env -i make -DALWAYS_CHECK_MAKE buildkernel KERNCONF=PROFANE
>     real    33m30.404s
>     user    30m42.769s
>     sys     2m52.994s
>
> (no difference)
>
> So my naive reading of the above is yes, the kernel 6.0 is quite a bit 
> more efficient on multiprocessor systems, the more the machine is 
> loaded, the more the difference.


but the real times didn't change.. (in fact got a bit worse in some 
cases) which I guess is something
that could be looked at..

did you build in a chroot so athat the same tools were being used both 
times :-)


>
> David Landgren