[math-fun] Lookup-table math
FYI -- In an age where you can purchase 128GB uSD cards for $50 (or less), who needs to do any calculations anymore? https://www.amazon.com/gp/product/B01M4MW74V Silicon Power 128GB Elite microSDXC UHS-1 Memory Card - with Adapter (SP128GBSTXBU1V20BS) Price: $49.99 & FREE Shipping --- I assume that we'll be back to purchasing (digital) math tables again. That's certainly the case today for modular and EC arithmetic. :-) As you can guess from the discussions, the article below was written quite a while ago, but his argument has gotten much better during the interim. http://wilsonminesco.com/16bitMathTables/ Large Look-up Tables for Hyperfast, Accurate, 16-Bit Scaled-Integer Math (Describes how to interface large -- greater than address space size -- ROMs to 8-bit microprocessors for ADC computations.)
Hello, a math table lookup on a SSD micro card ?: why not ... ok but the reading speed of those are something like 90 megs per second on a 'class 10' card, on the other hand there are those new ssd that can be plugged into a PCI express 4x slot (if you have one on your pc), http://www.materiel.net/ssd/samsung-serie-960-pro-m-2-pcie-vnme-2-to-136308.... the reading speed is 3500 megabytes per second. That's another animal, the drawback is of course the price and your electricity bill. ;-). and you have 1 TB of space to put tables. the price is about 650 us dollars. best regards, Simon Plouffe
Probably latency is much more important than bandwidth for this application. The latency of these cards is typically 100 microseconds for a random read (this is for a fast M2 card; secure digital cards and SATA are much slower). At 3GHz that's 300,000 cycles. Intel's XPoint (now branded Optane) promise much better latency, as low as 9 microseconds, but even this is 27,000 cycles. With a GPU and 9 microseconds you can do an awful lot of computation. On Sun, Apr 2, 2017 at 9:46 AM, Simon Plouffe <simon.plouffe@gmail.com> wrote:
Hello,
a math table lookup on a SSD micro card ?: why not ...
ok but the reading speed of those are something like 90 megs per second on a 'class 10' card,
on the other hand there are those new ssd that can be plugged into a PCI express 4x slot (if you have one on your pc),
http://www.materiel.net/ssd/samsung-serie-960-pro-m-2- pcie-vnme-2-to-136308.html
the reading speed is 3500 megabytes per second. That's another animal, the drawback is of course the price and your electricity bill. ;-). and you have 1 TB of space to put tables. the price is about 650 us dollars.
best regards,
Simon Plouffe
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participants (4)
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Adam P. Goucher -
Henry Baker -
Simon Plouffe -
Tomas Rokicki