On 12/16/11 07:44, Joe Holden wrote: > Arnaud Lacombe wrote: >> Hi, >> >> On Thu, Dec 15, 2011 at 2:32 AM, O. Hartmann >> <ohartman_at_zedat.fu-berlin.de> wrote: >>> Just saw this shot benchmark on Phoronix dot com today: >>> >>> http://www.phoronix.com/scan.php?page=news_item&px=MTAyNzA >>> >> it might be worth highlighting that despite Oracle Linux 6.1 Server is >> using a kernel + compiler almost 2 years old, it still manages to >> out-perform the bleeding edge FreeBSD :-) >> > serenity# gcc --version > gcc (GCC) 4.2.1 20070831 patched [FreeBSD] > > serenity# uname -r > 9.0-RC3 > For the underlying OS, as far as I know, the compiler hasn't as much impact as on userland software since autovectorization and other neat things are not used during system build. From my experience using gcc 4.2 or 4.4/4.5 does not have an impact beyond 3% when SSE isn't explicetly enforced. More interesting is the performance gain due to the architecture. I think it would be very easy for M. Larabel to repeat this benchmark with a "bleeding edge" Ubuntu or Suse as well. And since FreeBSD 9.0 can be compiled with CLANG, it should be possible to compare both also with "bleeding edge" compilers, say FreeBSD 9/CLANG, Ubuntu 12/gcc 4.6.2. >> Now, from what I've read so far in this thread, it seems that a lot of >> people are still in abnegation... >> >> my 0.2c, >> - Arnaud >> >>> It may be worth to discuss the sad performance of FBSD in some parts of >>> the benchmark. A difference of a factor 10 or 100 is simply far beyond >>> disapointing, it is more than inacceptable and by just reading those >>> benchmarks, I'd like to drop thinking of using FreeBSD even as a backend >>> server in scientific and business environments. In detail, some of the >>> SciMark benches look disappointing. The overall image can't help over >>> the fact that in C-Ray FreeBSD is better performing. >>> >>> From the compiler, I'd like say there couldn't be a drop of more than 10 >>> - 15% in performance - but not 10 or 100 times. >>> >>> I'm just thinking about the discussion of SCHED_ULE and all the saur >>> spots we discussed when I stumbled over the test. >>> >>> Regards, >>> Oliver
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