WinXP Clock Loses Time; Will Re-Sync Cause Problems?

We've recently upgraded to LabView7.1, and have recently noticed that our system clock is losing time at a much greater rate than it has in the past. The clock can be seen hanging every few seconds in the "Date and Time Properties" view where the date and time options of the computer can be set.
I may be incorrect, but I believe the system is unable to keep proper time due to the CPU intensive nature of our data logging VI's. We've decreased the data sample rates and resolution, as well as the displayed plotting rates of our collected data. This hasn't helped the problem. The plot of our CPU performance against time can be seen in Windows Task Manager, and our performance demonstrates a saw-tooth like curve o
f CPU usage, periodically saturating at 100% for a few seconds.
I'm interested in knowing if there is anything I can do to get my system keeping time correctly without any other time program intervention.
If I must incorporate the use of another time synchronization program like Thinking Man Software's Dimension 4 v5.0, how much risk am I running by having this extraneous program resynchronizing my clock while I'm logging data and executing VI's with time dependent loops?

It means that your VI uses all the ressources of your system.
This kind of phenomenon can occur when the system is overloaded with loops that are NOT timed.
If you time your loops (either with "timed loops" or "wait.vi" or "wait until next ms.vi")this should stop
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"Mark Hanning-Lee" wrote in message news:[email protected]...
> GP wrote:
> >
> > Running LabView VI on HP Brio pc
> > Computer clock loses time non-linearly
> > e.g. after 24 hours lost 5 mins, after 36
> > lost 20mins. Time stamped log file is therefore wrong.
> > Happens with both Win95 or Win98 OS but worse on Win95.
> > The VI is reading data from instruments on serial port
> > and also a GPIB interface. Very slow
> > logging though (1 reading/min over many days).
> > Does this look like a hardware or software issue? Has anyone ever
> > experienced this?
>
> A general points:
>
> Win98 tends to be worse at this than other OS; not just a LabVIEW issue.
> My Win98 PC used to lose minutes per day; my Win2000 PC loses only a few
> ms per day.
>
> Make SURE that every loop in your code has a Wait or Wait until next ms
> Multiple. That frees the CPU.
>
> If a problem gets worse with time, see whether your memory usage is
> growing with time.
> If so, look for Build Array that is running in a loop, causing a large
> array to grow without limits.
>
> Also make sure there is a Close function for every Open.
> Make sure that you aren't opening & closing inside a loop; correct
> behavior is to Open before a loop, Read and/or Write inside the loop, &
> Close at the end.
> That's true for serial i/o, for VISA, and for GPIB.
>
> Lastly, if you are now using classic GPIB & serial functions, consider
> switching to VISA. Or vice versa!
>
> In general, you can keep the clock sync'd by running the free Dimension
> 4 software from www.thinkman.com . That sets the PC clock at regular
> intervals so it stays more or less on time.
> (But I'd be reluctant to do that when the program is running; might mess
> up loop timing.)
>
> Mark

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WinXP Clock Loses Time; Will Re-Sync Cause Problems?

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