 | | | Dual-core Opteron Support on RHEL v3 | Dual-core Opteron Support on RHEL v3 2006-01-23 - By Brian Long
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On Mon, 2006-01-23 at 19:24 +0100, coyote@(protected) wrote:
> Hi All,
>
> I don't run an Opteron-based box at all I seem to recall that someone
> (Brian Long from Cisco, maybe) had some cache-trashing & performance
> issues on dual-core opteron systems from Sun (V20z and V40z) when running
> some huge parallel makes on these boxes (RHEL3 U5 & U6). I don't know if
> these were resolved but the issues seemed serious enough to be taken with
> care.. I don't know if RHEL4 handles this differently, though..
>
> PS: Look in the RHEL3 archives for the "Dual-core & Parallel Compile
> Issues" thread (no pun intended).
Vincent,
Your are correct that this was my issue, but we've found the real
culprit. We were using back-end Teambuilder nodes (product from
Trolltech) to run the gcc invocations. It turns out that if I run a
compile job on the front-end 8-way (4 dual-core) system without
Teambuilder, it outperforms single-core performance.
When I enable TeamBuilder, it's performance is worse than the single-
core node and we've deduced this is because of the reduced clock speed
on the dual cores (because of the way Teambuilder works).
Because of this new-found data (as of about 10 days ago), we are re-
evaluating dual-core systems for these compiles as well as for business
apps like Oracle RDBMS. Internally, we are skipping RHEL 3 Update 6 and
we're releasing an Update 7-based distro in the April timeframe where we
also plan to announce internal IT support for dual-core systems.
/Brian/
--
Brian Long | | |
IT Data Center Systems | .|||. .|||.
Cisco Linux Developer | ..:|||||||:...:|||||||:..
Phone: (919) 392-7363 | C i s c o S y s t e m s
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