In a message dated 10/18/2005 8:59:24 A.M. Central Daylight Time, [EMAIL PROTECTED] writes:
>ISTR that Hasp used various "interleave" factors to write logical >blocks 1,2,3 et cetera as physical blocks 1,3,5.. or 1,4,7.. so that >in the time that it took to traverse the intervening trackspace the >Problem Program (such an appropriate term) had the opportunity to >generate another block of output lines. Yes. And the interleaving factor was a user-changeable parameter (HASP Installation Parameter). I think it defaulted to 1, which meant one DASD block would be skipped when sequentially moving through the SYSOUT data belonging to one file. E.g., if there were five blocks per track, then they were formatted with record numbers in the count fields of 1, 4, 2, 5, 3. The idea was to allow for extra DASD latency time to overlap the time it took either for the application program to generate the next block of SYSOUT or else for the HASP Print/Punch code to deblock all the logical records in one block and send those logical records to either a real local or remote printer or punch (or other unit record device, such as a plotter). Two things wrong with this idea were that (1) all SPOOL volumes would be formatted the same, and thus some application programs might generate SYSOUT at rates that did not match the latency, and (2) there were no high-speed DASD back-up and restore utilities available that could handle non-isotonically increasing DASD record numbers. >Today, while waiting on the 'phone for a customer to check a library >for something, I filled and switched the electric kettle on, >interleaving two tasks, using the latencies in each to do something >useful in the other. Women, generally, are better trained at this >multitasking, IMO :-) . I disagree. I think most men and women are equally capable of multi-tasking. But I think most women are more easily distracted by task(N+1) while multitasking on tasks(N-1 and N) and then they forget about tasks (N-1 and N). Just my opinion. Bill Fairchild ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
