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Geek Culture / Windows & PC time clock

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Morcilla
21
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Joined: 1st Dec 2002
Location: Spain
Posted: 31st Jan 2008 10:14
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Hi,

have you noticed that windows/PC clock gets ahead or delayed when running CPU is at 100%?

At idle, windows/PC clock seems fairly good. Now do a 15 minutes test at 100% CPU with an external watch clock. Depending on the hardware, it can offset like 8 seconds (!)

It seems a platform hardware issue, I've tried with different machines and the offset always appears.

Interesting, isn't it?
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SirFire
19
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Joined: 4th Apr 2005
Location: North America
Posted: 31st Jan 2008 10:28
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I ran a DBP app for about 10 minutes, and the PC clock remained in perfect sync with my stopwatch.

Asus mobo, p4 2.4ghz, 2gigs ram, 6600gt and mx4000 vidcards

_____________________
Windows Vista: Just say no.
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Morcilla
21
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Joined: 1st Dec 2002
Location: Spain
Posted: 31st Jan 2008 11:20
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Well, I've noticed around [0.8 - 1.5] seconds for every 15 minutes for some hardwares, so perhaps 10 minutes is not enough for a good hardware to have the offset measureable.
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Kentaree
22
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Joined: 5th Oct 2002
Location: Clonmel, Ireland
Posted: 31st Jan 2008 14:45
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Haven't tried it, but as a solution, have you considered using NTP to keep your clock automatically synced?

Devhat Developer Network and IRC Channel
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NeX the Fairly Fast Ferret
19
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Joined: 10th Apr 2005
Location: The Fifth Plane of Oblivion
Posted: 31st Jan 2008 17:01
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Mine has never successfully synchronised with the Microsoft time server or otherwise. I've never had any luck on other systems, either.

[href: http://forum.thegamecreators.com/?m=forum_view&t=121881&b=8]Test[/href]
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Morcilla
21
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Joined: 1st Dec 2002
Location: Spain
Posted: 1st Feb 2008 11:17
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Well, not really wanting to solve it, just pointing it out.

To sync the clock with an external server just sets it right from time to time, in the meantime, the offset is still produced. I think high precision timer libraries are the best approach if wanting to face this behaviour.

So, no one else is that surprised with this... I thought you'd find it somewhat noticeable.
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Satchmo
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Joined: 29th May 2005
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Posted: 1st Feb 2008 20:58
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Im running Vista, the clock seems pretty synced up with every other one in my house.

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