On Mon, 19 Feb 2024 21:54:56 -0600, Charles Mills wrote: > ... your program or some other unrelated program -- has recently issued an > STCK and your program must spin, consuming CPU cycles, until a unique STCK > ... > >OTOH, if you do need a monotonic value, then you should redesign and recode to >use STCKE. > STCKE is faster than STCK because its granularity if finer and doesn't need to spin as long.
How many instructions could have been issued during such a (microcode) STCKE spin? I know, it's model dependent. And a mischievous programmer could contrive to line up all the CPUs abreast and issue STCKE simultaneously to exhibit the worst case. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
