Thanks. This is interesting. Possibly also of interest: https://clearlinux.org/ Not for HPC, but some aspects look useful.
On 09/10/2018 06:50 AM, John Hearns via Beowulf wrote:
Chris Samuels recent post reminds me. I went to a fascinating and well delivered talk by Jason Hearne McGuiness https://www.meetup.com/ACCULondon/events/253570550/ https://accu.org/index.php/accu_branches/accu_london Slides are here: https://github.com/acculondon/2018-September I would encourage everyone to give this presentation at least a browse. Jason has done a lot of work in comparing the assembler code emitted by C++ compilers for simple statement blocks. Even within the g++ series there are wildly different assembler sequences emitted. And of course differences between Intel and Clang. I would have naively assumed that within g+++ at least as improvements are made then there would be some commonality - ie an evolution. But I would be wrong. Jason work in HFT so the default path loaded in IF statements (for instance) is important for low latency. Jason also did a lot of work in comparing performance before and after the Spectre/Meltdown fixes. There is a huge amount of work gone into that. One other takeaway - the choice of Linux OS is critical. Really. Common wisdom is that OS choice accounts for approx. 4% of performance difference. Not so. There isa big difference between CentOS 6 and 7 (7 being better) and Ubuntu does not shine at all well on his FIX benchmarks. Gentoo does well - Jason being a fan of Gentoo. As I remember on these benchmarks OS choice can affect results by 20% !!!! Lastly Jason mentioned IncludeOS http://www.includeos.org/ these gusy are implementing something I have tossed about on this list in the past - running applications in a lightweight OS without all the overhead of a multitasking system. I dont know that much about it - is anyone from that company on the list? John Hearns _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
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