Seymour Cray and the Development of Supercomputers
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Seymour Cray and the Development of Supercomputers
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Re: Seymour Cray and the Development of Supercomputers
#2Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
Re: Seymour Cray and the Development of Supercomputers
#3Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
Hold on there cowboy, the Cray 2 did 1.9 GFLops [1] but todays phones peak at 0.3 GFlops[2].
[1] https://en.m.wikipedia.org/wiki/Cray-2 [2] http://www.greenecomputing.com/apps/linpack/linpack-top-10/
Re: Seymour Cray and the Development of Supercomputers
#4Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
Hold on there cowboy, the Cray 2 did 1.9 GFLops [1] but todays phones peak at 0.3 GFlops[2]. [1] https://en.m.wikipedia.org/wiki/Cray-2 [2] http://www.greenecomputing.com/apps/linpack/linpack-top-10/
“Anyone can build a fast CPU. The trick is to build a fast system.” - Seymour Cray
Re: Seymour Cray and the Development of Supercomputers
#5Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
Hold on there cowboy, the Cray 2 did 1.9 GFLops [1] but todays phones peak at 0.3 GFlops[2]. [1] https://en.m.wikipedia.org/wiki/Cray-2 [2] http://www.greenecomputing.com/apps/linpack/linpack-top-10/
The iPhone 6S is rated at 172.8 GFlops.
https://en.wikipedia.org/wiki/Apple_mobile_application_proce...
Re: Seymour Cray and the Development of Supercomputers
#6Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
I often thought this, but a Cray is not a normal computer. From some comment, I learned that it had a 8MB L1 cache, meaning it could crunch all of it in one go, then refill, so on and so forth. It means these little 800MHz were used to their fullest, while nowadays multicore GHz chip have to wait a lot to get new data in smaller quantities. Making a Cray still as fast today (for adequate tasks of course).
So todays processor have higher peak bandwidth, on average, Cray can sustain larger bandwidth.
ps: https://archive.is/FWzLF read jojomonkeyboy comment
Re: Seymour Cray and the Development of Supercomputers
#7Growing up in the 80s, the Cray 2 was my poster computer. Until the day came when I realized it was only 800MHz and had 4GB RAM, and my phone was faster than that.
I often thought this, but a Cray is not a normal computer. From some comment, I learned that it had a 8MB L1 cache, meaning it could crunch all of it in one go, then refill, so on and so forth. It means these little 800MHz were used to their fullest, while nowadays multicore GHz chip have to wait a lot to get new data in smaller quantities. Making a Cray still as fast today (for adequate tasks of course). So todays p…
Most of the Gflops in a phone are in the GPU - precisely because it's massively parallel, like the Cray.
Intel's i7s and Xeons have a more general purpose architecture with much less parallelism, but still manage a steady few hundred Gflops on Linpack.
Re: Seymour Cray and the Development of Supercomputers
#8Cray 1: 80 MFLOPS and 8 megabytes in 1976. That was the standard for "mini-supercomputers" in the 1980s.
Re: Seymour Cray and the Development of Supercomputers
#9Earlier quoted context omitted.
I often thought this, but a Cray is not a normal computer. From some comment, I learned that it had a 8MB L1 cache, meaning it could crunch all of it in one go, then refill, so on and so forth. It means these little 800MHz were used to their fullest, while nowadays multicore GHz chip have to wait a lot to get new data in smaller quantities. Making a Cray still as fast today (for adequate tasks of course). So todays p…
Most of the Gflops in a phone are in the GPU - precisely because it's massively parallel, like the Cray. Intel's i7s and Xeons have a more general purpose architecture with much less parallelism, but still manage a steady few hundred Gflops on Linpack.
True, I was speaking about the CPUs. Also GPU are still dedicated to graphical workload on smartphone, or are they used through an opencl-like lib ?
Re: Seymour Cray and the Development of Supercomputers
#10Recommended reading for all Cray fans http://www.amazon.com/Supermen-Seymour-Technical-Wizards-Sup...