Computing Performance Google Group

Intel Atom vs Core

flucifr...@acm.org (Federico Lucifredi) — Mon, 13 May 2013 21:52:40 UT

Interesting comparison between Atom and Core processor performance on the
pages of RTC magazine:
[link]
Best -Federico

Load Average Redux: One metric to rule them all

flucifr...@acm.org (Federico Lucifredi) — Wed, 20 Mar 2013 00:57:43 UT

Hello Computing Performance,
Our favorite topic makes a comeback, as the feature of my Admin Magazine
monthly column. I thought if I could spare ourselves a few future
questions on the subject, the public service announcement was well worth it
[link]

Xeon Phi Coprocessor Optimization

flucifr...@acm.org (Federico Lucifredi) — Wed, 20 Mar 2013 00:41:24 UT

Hello Computing Performance,
I am reading the MK book "Intel Xeon Phi Coprocessor High Performance
Programming", and I just realized Intel has two whitepapers on Xeon Phi
tuning already up on their site:
[link]

Re: [computing-perf] openbenchmarking.org

ag...@agner.org (Agner Fog) — Tue, 13 Nov 2012 07:20:34 UT

How open is openbenchmarking.org? It is not very clear from the website
whether it is a non-profit organization or a privately owned company.

An open platform for exchanging performance-related information sounds
like a good initiative, but I wouldn't like to work for free for such a
platform if somebody else can copyright my contribution and make money

openbenchmarking.org

flucifr...@acm.org (Federico Lucifredi) — Mon, 12 Nov 2012 23:46:10 UT

Hello Computing Performance,
On a completely separate note, I need to mention that the Phoronix team,
headed by Michael Larabel, has recently created
[link]
As a community where results of performance testing are stored and
shared. I am curious to see if it picks up steam, I think there is some

Tuning Garbage Collection in Virtualized environments

flucifr...@acm.org (Federico Lucifredi) — Mon, 12 Nov 2012 21:54:42 UT

Hello Computing Performance,
Emad Benjamin has given a superb presentation at the local New England
Java User Group (NEJUG), from the looks of it. I was away on business, but
the slides (200 of them!) tell very interesting stories about the art of GC
tuning, adding virtualization to the mixture - I wish I had seen this years

Re: New C++ vector class library

flucifr...@acm.org (Federico Lucifredi) — Sat, 22 Sep 2012 16:35:00 UT

Impressive - well done Agner!
Apologies for the late reply, somehow I had missed the original message.
Best -F

Disks lie: Disks from the perspective of the filesystem

flucifr...@acm.org (Federico Lucifredi) — Sat, 22 Sep 2012 16:33:02 UT

Hello Computing Performance,
Marshall Kirk McKusick contributed this interesting piece to the ACM
Queue:
Disks from the Perspective of a File System - Disks lie. And the
controllers that run them are partners in crime.
[link]
Concise and very interesting. Looks at how the underlying disk

Re: Load average vs runq

flucifr...@acm.org (Federico Lucifredi) — Tue, 17 Jul 2012 01:51:53 UT

Hello Computing Performance,
I just noticed that the kernel has now distributed logic to computing
these numbers - and there is an update pending for the next kernel, too.
Looks like the old code was too taxing sampling-wise for many-core CPUs.
The patch for the upcoming 3.5 kernel is here (RC7), for those interested.

Re: Thread profiler.

ardyfa...@gmail.com (Ardy Falls) — Thu, 12 Jul 2012 08:18:10 UT

Ok, I release it...
[link]

Re: Thread profiler.

ardyfa...@gmail.com (Ardy Falls) — Mon, 09 Jul 2012 21:55:33 UT

I am working on one now, I will release it soon too google code, once I do,
I'll post again in this thread.

Re: [computing-perf] x32 ABI

flucifr...@acm.org (Federico Lucifredi) — Sun, 08 Jul 2012 13:27:12 UT

I was speaking about this with one of the glibc maintainers, and he also was ofthe opinion that the advantages were too small.

Thanks -F

______________________________ ___________
-- "'Problem' is a bleak word for challenge" - Richard Fish
(Federico L. Lucifredi) - flucifredi at acm.org - GnuPG 0x4A73884C

Re: [computing-perf] x32 ABI

ag...@agner.org (Agner Fog) — Sun, 08 Jul 2012 07:39:34 UT

Thanks for pointing out the x32 ABI. I am not on the Linux kernel
mailing list so I was not aware of it.

I think the advantage of x32 over x64 is small because everything pushed
on the stack is still 64 bits.

The current default data model for x64 Linux already allows 32-bit
absolute pointers. We only need compiler support for it. (is it possible

x32 ABI

flucifr...@acm.org (Federico Lucifredi) — Sun, 08 Jul 2012 03:16:44 UT

Hello Computing Performance,
I have been reading about the x32 ABI, found a few interesting
resources:

[link]

and the Intel presentation:
[link]

The summary seems to be, x64 with 32-bit pointers - as the x86 model

New C++ vector class library

ag...@agner.org (Agner Fog) — Sun, 03 Jun 2012 09:25:20 UT

Great news. I have made a new vector class library for x86 and x86-64
that makes it easier to use the vector instruction sets from SSE2 to AVX
and AVX2. It's a C++ library that defines a lot of vector classes,
functions and operators. Adding two vectors is as simple as writing a +
sign instead of using assembly code or intrinsic functions. This is