[time-nuts] Lady Heather Overhead

[Steve Rooke]

Well, it then looks like it is going through this rapid loop of giving
up processing power and asking for it again immediately, and on my
system there is plenty of spare capacity so it gets its thread back
again. Perhaps this is what is generating all the masses of system
calls as the balance between user and system processing is all wrong.
Does the code not indicate that it needs CPU via waits, real sleeps or
interrupts on I/O and the like. Just believing that the system it is
running on is solely dedicated to it seems a little strange to me but
then I come from a multitasking background where we learn to share,
and have CPU idle time.

Steve Rooke

2010/1/1 Mark Sims <holrum at hotmail.com>:
>
> An idle Windows machine allocates 50% of its resources to a task when it starts up.  This shows up as 50% CPU utilization.  A second Heather will show as around 100% total utilization (50 % each).  These usage numbers are totally bogus.
>
> Heather VERY  periodically returns it's time slot to the system with the flag that says,  "Hey,  if you aren't doing anything else,  I'd kinda like that time back.".   So if you bring up four Heathers,  each will then show 25% utilization, etc.   I have seen a dozen Heathers running on a fairly slow machine (and quite a sight it is).
>
> Basically all the Heathers soak up all the free time on the system and share it amongst themselves.  The program runs just fine on a 100 MHz WIN98 laptop.  If you are actually using a full core,  you have other problems...
>
> There is a recently added command line flag (/tw=msecs) that says to force Sleep(msecs) calls in place of Sleep(0) calls.  It slows the system response time down,  but might be useful for power saving on laptops, etc.
>
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> Mark  John
>
> from a nut post:
>> do know that
>>
> there is a fair amount of processor load, including a lot of system
>>
> calls. On my system, running LH under wine takes the equivalent of 1
>> CPU
> on my quad core.
>
>
> I'm sure not new to you and I hardly know what
> I'm talking about BUT what I have noticed is:
>
> MY LadyHeather programs
> will take all the spare windows processor time available even on my fastest
> windows XT machine.
> And then again I have no trouble running at
> least four simultaneous LH programs (even different versions)  all at the
> same time on a slow machine, so they don't need much, they'll just
> take whatever is available, but they seem to share
> well.
>
>
>
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-- 
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.