Hi Tony, David and all,
Does anyone remember how many transistors are in a link? We are
gathering information on transistor efficiency; now Tony's numbers
indicate floating point costs about 50,000, and David on memory
indicates 4KB costs about 200,000. 25,000 for CPU and 25,000 for
links would indicate 6000 per link, but that is just a guess and I
could be way off.
As you may be guessing, I am imagining an eight-link Transputer!
Long ago, in my PDPTA'96 Roadmap paper, I calculated "burden
bandwidth" for a one-direction link communication using Forrest
Crowell and Neal Elzenga's published measurements, and got
37MB/s, same whether links were running one-way or both-ways,
and per-unidirectional-communication timing bandwidth of 1.2 MB/s
when running both ways. This means by extrapolation that eight
links running full speed both ways would be supportable (reducing
CPU speed by 52% due to DMA burden).
Everything can be mapped into modern cores and communications
(e.g. Manchester code lanes); the principle stays the same.
Larry
Hi Larry
As I recall, T414 was about 250,000 and the T800 was 300,000.
Tony Gore
All,
How many transistors does a Transputer have (e.g. of the T2 or T4 family)? I have heard a wide range numbers from 27,000 to 200,000, but am having trouble finding an authoritative reference.
Larry