j...@well.com (Jack J. Woehr) writes: > How about "if all my disparate operating systems support TCP/IP and > C/C++, it's easier to accomplish the mission"? > > Which is more or less what it has come down to.
re: http://www.garlic.com/~lynn/2015g.html#78 Term "Open Systems" (as Sometimes Currently Used) is Dead -- Who's with Me? original mainframe TCP/IP product was done in vs/pascal for VM370 and communication group was sort of pushed into corner to eventually let it be released ... however with some performance issues (max 44kbyte/sec using nearly full 3090 processor). It was ported to MVS by providing simulation for the required VM370 functions. Open systems have had epidemics of exploits and vulnerabilities attributed to C-language buffer length and addressing semantics (the mainframe vs/pascal implementation was not known to have similar problems) ... some past posts on the subject http://www.garlic.com/~lynn/subintegrity.html#buffer I did the modifications to the vm370 version to support RFC1044 ... and in some tuning tests at Cray research got sustained channel throughput between 4341 and Cray using only modest amount of 4341 processor time. (possibly 500 times improvement in bytes moved per instruction executed). some past posts http://www.garlic.com/~lynn/subnetwork.html#1044 much later the communication group hired a subcontractor to do TCP/IP implementation in vtam and after the initial demonstration they told him that everybody *knows* that a *valid* tcp/ip implementation is slower than LU6.2, and they would only be paying for a *valid* implementation. we were also working with NSF and its supercomputer centers on interconnecting the labs ... originally we were suppose to get $20M. Then congress cut the budget and some other things happened and finally NSF releases RFP (several pieces based on what we already had running) ... but internal politics prevents us from bidding. The director of NSF tries to help and writes the corporation a letter (copying the CEO) with support from other agencies ... but that just made the internal politics worse (as did comments that what we already had running was at least five years ahead of all bid submissions). some old email http://www.garlic.com/~lynn/lhwemail.html#nsfnet as regional networks connect into the nodes, it evolves into the NSFNET backbone ... precursor to modern internet. some discussion http://www.technologyreview.com/featuredstory/401444/grid-computing/ some past posts http://www.garlic.com/~lynn/subnetwork.html#nsfnet and http://www.garlic.com/~lynn/subnetwork.html#internet -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
