Re: [Beowulf] Quadrics?

2011-04-04 Thread Beat Rubischon
Hi Vincent! On 04.04.11 21:16, Vincent Diepeveen wrote: > latency is superior of quadrics compared to all the infini* stuff. Quadrics was great stuff - but it was outperformed once Mellanox invited their ConnectX chips. Additional the Quadrics team never got their PCIe chips (QSnet III) to fly. F

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Greg Lindahl
On Mon, Apr 04, 2011 at 09:54:37AM -0700, Massimiliano Fatica wrote: > If you are old enough to remember the time when the first distribute > computers appeared on the scene, > this is a deja-vu. Not to mention the prior appearance of array processors. Oil+Gas bought a lot of those, too. Some imp

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Mark Hahn
well, for your application, which is quite narrow. >>> >>> Which is about any relevant domain where massive computation takes place. >> >> you are given to hyperbole. the massive domains I'm thinking of >> are cosmology and explicit quantum condensed-matter calculations. >> the experts in t

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Vincent Diepeveen
On Apr 4, 2011, at 11:54 PM, Mark Hahn wrote: >>> well, for your application, which is quite narrow. >> >> Which is about any relevant domain where massive computation takes >> place. > > you are given to hyperbole. the massive domains I'm thinking of > are cosmology and explicit quantum conde

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Mark Hahn
>> well, for your application, which is quite narrow. > > Which is about any relevant domain where massive computation takes place. you are given to hyperbole. the massive domains I'm thinking of are cosmology and explicit quantum condensed-matter calculations. the experts in those fields I talk

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Vincent Diepeveen
On Apr 4, 2011, at 10:20 PM, Mark Hahn wrote: >> GPU's completely annihilate cpu's everywhere. > > this is complete nonsense. GPUs do very nicely on a quite narrow > set of problems. for a somewhat larger set of problems, they do OK, > but pretty "meh", really, considering. for many problems

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Mark Hahn
> GPU's completely annihilate cpu's everywhere. this is complete nonsense. GPUs do very nicely on a quite narrow set of problems. for a somewhat larger set of problems, they do OK, but pretty "meh", really, considering. for many problems, GPUs are irrelevant, whether that's because the proble

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Vincent Diepeveen
On Apr 4, 2011, at 6:54 PM, Massimiliano Fatica wrote: > If you are old enough to remember the time when the first distribute > computers appeared on the scene, > this is a deja-vu. Developers used to program on shared memory ( > mostly with directives) were complaining > about the new programmin

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Vincent Diepeveen
you can forget about getting much info other than marketing data. the companies and orgainsations that already calculate for years at gpu's they are really good in keeping their mouth shut. But if you realize that even with 16 fast AMD cores (which for this specific prime number code are a LO

Re: [Beowulf] Chinese supercomputers to use ‘homemade’ chips

2011-04-04 Thread Vincent Diepeveen
On Mar 11, 2011, at 7:20 AM, Mark Hahn wrote: >> Interesting: >> Chinese supercomputers to use ‘homemade’ chips >> http://timesofindia.indiatimes.com/tech/personal-tech/computing/ >> Chinese-supercomputers-to-use-homemade-chips/articleshow/7655183.cms > > it's important to remind ourselves that

Re: [Beowulf] Quadrics?

2011-04-04 Thread Vincent Diepeveen
hi, sometimes i go through a lot of mails at the mailing list here and had missed this one. please keep me up to date and/or add me to mailing lists there. latency is superior of quadrics compared to all the infini* stuff. drivers that integrate into kernels - well some modifications shouldn'

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Massimiliano Fatica
If you are old enough to remember the time when the first distribute computers appeared on the scene, this is a deja-vu. Developers used to program on shared memory ( mostly with directives) were complaining about the new programming models ( PVM, MPL, MPI). Even today, if you have a serial code th

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Lux, Jim (337C)
You've described it pretty well.. Look how long it took for "standard libraries" to take advantage of things like MPI to become "of course we use that".. If the original code used standard library calls for things like matrix math, and it's a "drop in" so you could do a "test case" in less than

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread C. Bergström
Herbert Fruchtl wrote: > They hear great success stories (which in reality are often prototype > implementations that do one carefully chosen benchmark well), then look at > the > API, look at their existing code, and postpone the start of their project > until > they have six months spare tim

Re: [Beowulf] GP-GPU experience

2011-04-04 Thread Herbert Fruchtl
They hear great success stories (which in reality are often prototype implementations that do one carefully chosen benchmark well), then look at the API, look at their existing code, and postpone the start of their project until they have six months spare time for it. And we know when that is.