Another application by the VMSG author was parasite/story. It used the PVM logical device/3270 facility and had a HLLAPI type scripting language (before the advent of ibm/pc) ... it was "after" REX was available internally. Another remarkable thing was that the executable was small enough to fit in the CMS "transient" area.
some old storys ... including automatic logging into RETAIN and retrieving PUT buckets: http://www.garlic.com/~lynn/2001k.html#35 Newbie TOPS-10 7.03 question http://www.garlic.com/~lynn/2001k.html#36 Newbie TOPS-10 7.03 question for other topic drift ... in the early 80s I did a re-implementation of the spool file system written in vs/pascal running in virtual machine. a problem was that HSDT project was putting in multiple T1 (and higher speed links) ... with aggregate thruput requirements of megabyte/sec or more. This was effectively impossible with RSCS and the existing spool file system. The spool file interface was synchronous transfer of 4k block at a time. On a system with competing transfers, a RSCS transfer might be stuffed in queue with 3-4 other operations ... giving RSCS possibly 4-5 4kbyte transfers/sec; I needed possibly 200-300 4kbyte transfers/sec for RSCS. I had my page-mapped filesystem for CMS with things like contiguous allocation, efficient multiple block transfers and while CMS might view the interface as synchronous ... but playing games with page table entries allowed for asynchronous transfers (a CMS application with moderate filesystem use had something like three times the thruput using page-mapped filesystem compared to normal CMS filesystem running on exact same hardware), i could leverage that interface for the virtual machine spool file implementation ... but I was taking spool file assembler kernel implementation, redo it in virtual machine pascal implementation and get at least 100 times increased thruput. The additional challenge was that since RSCS transferred the whole 4k spool file block ... all of the high-thruput changes & modifications had to be done so that they were transparent and interoperated with RSCS running on unmodified vm370 systems. old posts on the subject in this mailing list http://www.garlic.com/~lynn/2000b.html#43 Migrating pages from a paging device (was Re: removal of paging device) http://www.garlic.com/~lynn/2003k.html#63 SPXTAPE status from REXX other posts on the subject: http://www.garlic.com/~lynn/94.html#22 CP spooling & programming technology http://www.garlic.com/~lynn/94.html#29 CP spooling & programming technology http://www.garlic.com/~lynn/2003b.html#33 dasd full cylinder transfer (long post warning) misc. past HSDT posts http://www.garlic.com/~lynn/subnetwork.html#hsdt -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970
