Re: Architectural implications of locate mode I/O

mitchalsup@aol.com (MitchAlsup1) writes:

Once you recognize that I/O is eating up your precious CPU, and you
get to the point you are willing to expend another fixed programmed
device to make the I/O burden manageable, then you basically have
CDC 6600 Peripheral Processors, programmed in code or microcode.

>
Jan1979, I had lots of use of an early engineering 4341 and was con'ed
into doing a (cdc6600) benchmark for national lab that was looking for
70 4341s for computer farm (sort of leading edge of the coming cluster
supercomputing tsunami). Benchmark was fortran compute doing no I/O and
executed with nothing else running.
>
4341: 36.21secs, 3031: 37.03secs, 158: 45.64secs

>
now integrated channel microcode ... 158 even with no I/O running was
still 45.64secs compared to the same hardware in 3031 but w/o channel
microcode: 37.03secs.
>