Einstein in the News

tullio
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Will ATLAS appear in the top

Will ATLAS appear in the top 500 list to be published at the Dresden ISC? I was glad to see a picture of today Dresden, after having read "Slaughterhouse number 5" by Kurt Vonnegut.
Tullio

Bernd Machenschalk
Bernd Machenschalk
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RE: Will ATLAS appear in

Message 81958 in response to message 81957

Quote:
Will ATLAS appear in the top 500 list to be published at the Dresden ISC?


YES. The Linpack tests mentioned in the article have been done just for that.

BM

BM

Mike Hewson
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RE: Do you refer to c't

Message 81959 in response to message 81956

Quote:

Do you refer to c't 13/2008, S. 18: Supercomputer? There Andreas Stiller points out that the average Einstein@home host doesn't have the necessary "local capacity" ("lokale Speicherkapazität"). This is a bit misleading; actually the limiting factor for the searches we can run on Einstein@home is not so much the local power of the participant's machines, but the bandwidth with which we can transfer data between these and our servers. If we'd have a network to the Einstein@home participants as powerful as that we have on ATLAS - non-blocking "wire-speed" Gigabit-Ethernet between 1342 Nodes (4 cores per node, not 671 with 8 cores as Andreas wrote), we wouldn't need ATLAS.

ATLAS will run different types of searches for gravitational waves that are not suitable for Einstein@home, e.g. because you can't easily split the required data into such small pieces as we do for the continuous wave search. Probably similar to what Nemo does now (the "nice" CPU is usually Einstein@home).

Edit: ATLAS will probably contribute its idle time to Einstein@home from S5R4 on.

BM


Ah well, anytime E@H wants to do a dedicated fibre optic rollout then mark me down! A star topology perhaps? :-)

I guess the sin is that we're not in each others level 2 cache all day, speed of light not withstanding ..... :-)

@ulenz : any help is appreciated :-)

@JoeB : there are alot of neat analogies with M&M and LIGO:

- null comparator

- small signal expectation

- signal 'dithering' to enhance shifts

- motion of detector crucial to interpretation

- path folding

- environmental noise suppression

- several versions

Mind you I think a photodetector, or three, would have come in handy back then.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

ulenz
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RE: If we'd have a network

Message 81960 in response to message 81956

Quote:

If we'd have a network to the Einstein@home participants as powerful as that we have on ATLAS - non-blocking "wire-speed" Gigabit-Ethernet between 1342 Nodes (4 cores per node, not 671 with 8 cores as Andreas wrote), we wouldn't need ATLAS.

ATLAS will run different types of searches for gravitational waves that are not suitable for Einstein@home, e.g. because you can't easily split the required data into such small pieces as we do for the continuous wave search.
BM

Bernd:
My PC is reachable via DSL 7/24 if needed (up to 16000kbit/s down, 800 kbit/s up). I would be able to download and crunch data packages which are ten times and more bigger then now without any problems.Isn't that enough for your demands in comparison with an ATLAS-node?

Intel Q9300 Quadcore, 2500 Mhz, 4096 MB RAM, GeForce 9800 GT, Vista Ultimate 64-bit, Ubuntu 10.10 64 bit

Bernd Machenschalk
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RE: RE: Will ATLAS appear

Message 81961 in response to message 81958

Quote:
Quote:
Will ATLAS appear in the top 500 list to be published at the Dresden ISC?

YES. The Linpack tests mentioned in the article have been done just for that.

Top 500 June 2008 Rank 58

BM

BM

Mike Hewson
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RE: Top 500 June 2008 Rank

Message 81962 in response to message 81961

Quote:
Top 500 June 2008 Rank 58


Interestingly the OS stats show absolute dominance of Linux/Unix + variants. You know who doesn't even get onto the pie chart!

I wanna SuperBlade .... oh, it's all good :-)

Cheers, Mike.

( edit ) Just so you don't die wondering, you can get a 10 unit SuperBlade ( Intel Xeons x4 x quad core per unit ) with all the biggest, hottest & redundant stuff for ~ $20K USD. Will that be cash, credit card or cheque Sir? Seriously, banks are the wrong places to rob ...... these supercomputing centres would want to be very earnest about security.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

tullio
tullio
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Well, my SUN/Opteron combo is

Well, my SUN/Opteron combo is number 4 after 3 IBM. Cheers!
Tullio

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