Any Rubix Cube can be solved in 20 moves

[YosemiteSam]

This is pretty cool. It proves that any Rubix Cube, no matter how messed up and be solved in 20 moves or less.

I would post the page here, but there are some charts and other things that make it much better to just read there.

LINK

 

[Phoenix]

Well heck. I could have really used that information about, oh, 30 years ago.

 

[DallasCowboysRule!]

How long is a CPU year?

 

[YosemiteSam]

How long is a CPU year?

1 year. For instance if they had 365 CPUs running simultaneously for 1 full day, the total CPU time used would equate to one year of (CPU) time.

NASA's new "Discover" super computer has a total of about 15,000 processors. If you were to run Discover at maximum capacity (using all CPUs) for one full day, it would be as if you computed whatever it is you were doing on one CPU for over 41 straight years!

15,000CPUs running for 1 day / 365 days in a year = 41.0958 years of CPU time.

 

[joseephuss]

1 year. For instance if they had 365 CPUs running simultaneously for 1 full day, the total CPU time used would equate to one year of (CPU) time.

NASA's new "Discover" super computer has a total of about 15,000 processors. If you were to run Discover at maximum capacity (using all CPUs) for one full day, it would be as if you computed whatever it is you were doing on one CPU for over 41 straight years!

15,000CPUs running for 1 day / 365 days in a year = 41.0958 years of CPU time.

Is processor speed taken into account? Processor A may be a lot faster than processor B.

 

[YosemiteSam]

Is processor speed taken into account? Processor A may be a lot faster than processor B.

Nope. Thats where they use FLOPS. (FLoating point Operations Per Second)

yottaFLOPS 10 to the 24
zettaFLOPS 10 to the 21
exaFLOPS 10 to the 18
petaFLOPS 10 to the 15
teraFLOPS 10 to the 12
gigaFLOPS 10 to the 9
megaFLOPS 10 to the 6
kiloFLOPS 10 to the 3

The Discover supercomputer listed above is capable of (aggregate) 159 teraFLOPS. It can basically, calculate 159 trillion floating point operations per second. Discover is a Climate Simulation supercomputer.

Just to be clear, the Discover supercomputer wasn't used in the Rubix Cube calculations. I was just using it as an example.

 

[ABQCOWBOY]

Nope. Thats where they use FLOPS. (FLoating point Operations Per Second)

yottaFLOPS 10 to the 24
zettaFLOPS 10 to the 21
exaFLOPS 10 to the 18
petaFLOPS 10 to the 15
teraFLOPS 10 to the 12
gigaFLOPS 10 to the 9
megaFLOPS 10 to the 6
kiloFLOPS 10 to the 3

The Discover supercomputer listed above is capable of (aggregate) 159 teraFLOPS. It can basically, calculate 159 trillion floating point operations per second. Discover is a Climate Simulation supercomputer.

Just to be clear, the Discover supercomputer wasn't used in the Rubix Cube calculations. I was just using it as an example.

RPERF or Relative Performance is probably a more accurate measure. Floating Points are relative to a program and some Computers are designed to handle Floating Point Workloads better then others. I mean, what do you need? Do you need I/O or do you need Cache?

Either way, the guy that said, "useful 30 years ago" was probably right.

 

[YosemiteSam]

RPERF or Relative Performance is probably a more accurate measure. Floating Points are relative to a program and some Computers are designed to handle Floating Point Workloads better then others. I mean, what do you need? Do you need I/O or do you need Cache?

Either way, the guy that said, "useful 30 years ago" was probably right.

We were discussing supercomputers and more times than not; that (floating point) is the case since most are for number crunching. Both in scientific and computer animation.