[Info-vax] High resolution per-process CPU consumption statistics

[johnwallace4 at yahoo.co.uk]

On Tuesday, 24 March 2020 00:02:22 UTC, Mark Daniel  wrote:
> Would like to be able to measure process CPU consumed during specified 
> continuous sections of processing.  Only interested in CPU-intensive 
> sections so USER mode consumed relevant.  Imagine inserting calls at the 
> beginning and ending of those sections with a magic number representing 
> CPU consumption/delta/whatever made available.
> 
> As some of these CPU-intensive code sections are short duration the 
> granularity needs to be quite fine.  The likes of JPI$_CPUTIM and 
> LIB$STAT_TIMER (10mS) seem unsuitable.
> 
> Prepared for non- USER mode code.  This is only for ad hoc developmental 
> insight and not general use.  Needs to accommodate Alpha and/or Itanium 
> (and/or x86-64 :-)
> 
> And, of course, any other suggestion.
> 
> As always, TIA.

Is it safe to assume that the code in question is single-threaded?

Is it safe to assume that the code in question is running on a 
single-processor system?

Is an Alpha-only solution better than nothing at all?

Have a look at RPCC (Read Process Cycle Counter) in the Alpha/VMS
PALcode and see if it might help.

See e.g. the Alpha Architecture Reference Manual documentation e.g.
http://www.bitsavers.org/pdf/dec/alpha/Sites_AlphaArchitectureReferenceManual_1992.pdf
(there's probably more useful RPCC-related stuff available too).