Re: Architectural implications of locate mode I/O

Lynn Wheeler wrote:
 

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 

 
Do you have data on how the CDC 6600 did ?

>
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.