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Keep your pc clock synchronized
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Keep your pc clock synchronized

  #21 (permalink)
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gomi View Post
Well Dimension seems to be a basic NTPV3 client, so see above for drawbacks ;-)

Yes it is, but my clock is always very close. D4 shows you how much it moves the clock, and I never see more than very small fractions of a second, which is close enough for most things. Running your new GomTimeMeasure, it stays rock solid at <= 30ms delay. Good enough for me.

With that said, I am going to check out the NTP V4 though.

I assume you are looking at this to improve your GomRecorder?

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  #22 (permalink)
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Yes I was trying to see if the network latency is constant so I coould use System.Now as a time source to generate millisecond files. In my case it is not constant at all.

Please keep in mind that the indicator's meaningful value is when you see the values changing, so it gives you an indication of network lag increasing and decreasing, but the absolute number is meaningless unless you gave a good local clock precision (hence the NTPV4 stuff).

For instance, if your clock is 3 sec late, and the delay between the exchange and yourself is 3 sec, the indicator will show 0, even when in fact you're getting the ticks with 3 second lactency.

If your clock is 3 seconds ahead, and the network latency is 0 ms, the indicator will always show a delay of 3000 ms even when in fact you're getting your ticks in real time.

So I think there is a real use to get the clock of the PC at the best possible accuracy.

PS : there is a nice web site with screenshots of the install of NTPV4 client here:
http://www.satsignal.eu/ntp/setup.html

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  #23 (permalink)
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gomi, you should call up or email Ray @ NT and ask him to hire you. I know your not solely in it for the money, based simply on how much you've given away to the community for free. And I know you don't have gobs of free time. But I think there is a possibility for a good compromise, and you could only benefit their team with your experience

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  #24 (permalink)
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gomi View Post
Well Dimension seems to be a basic NTPV3 client, so see above for drawbacks ;-)

I'm curious what the limitation is of NTPV3? I read a theoretical limitation but in real concrete numbers. My PC clock was off several seconds and that messed up my chart markers. Now with dimension 4 my chart markers are never off. So I think it's within a second which is "good enough" for me. But I'm curious how much better this other solution could be.

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  #25 (permalink)
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Big Mike View Post
gomi, you should call up or email Ray @ NT and ask him to hire you.

Thanks Mike, it could be an idea but I have had some bad relations with the support team.
I can remember a specific time where I nearly YouTube - Really bad day at the office? 'ed my keyboard trying to explain to the developers the problem with time zone conversion due to the DST not being the same day for everyone.
It's here : BeginTime EndTime timezone ? - Page 2 - NinjaTrader Support Forum

They just weren't listening, and Dierk posted a message stating
"You are incorrect in your understanding. It's very simple to calculate the Begin/EndTimeLocal from the Begin/EndTimeExchange, the actual date is totally irrelevant. Just DayOfWeek matters. You will see with NTB5."

He withdrew his message, and what we actually saw in NTB5 was the implementation I had been asking for during the whole thread.... No apology, no thank you, no nothing...

So they are not really on my employer wishlist... I've had my lot of non-listening people !


Big Mike View Post
I know your not solely in it for the money


Nah, I'm on bigmike for the ego soothing ;-) Thanks guys !


Last edited by gomi; May 17th, 2010 at 09:39 AM.
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  #26 (permalink)
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cunparis View Post
I'm curious what the limitation is of NTPV3? I read a theoretical limitation but in real concrete numbers. My PC clock was off several seconds and that messed up my chart markers. Now with dimension 4 my chart markers are never off. So I think it's within a second which is "good enough" for me. But I'm curious how much better this other solution could be.

From what I've read NTPV4 is 10x more precise than NTPV3
NTPV3 on a WAN will give you accuracy ranging from a few 10s to a few 100s of millisecs
NTPV4 on a WAN will give you accuracy ranging from a few to a few 10s of millisecs.

With NTPV3 you clock drifts between updates, and the updates are made using "steps" . With NTPV4 you clock frequency is modified to compensate for drifts, clock modifications < 128 ms are smooth

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  #27 (permalink)
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Little upgrade on the topic. Here's how my clock is doing.

As you can see, for now the algo isn't making my offset converge.
Offset is the measure you're interested in, because it indicates the error between the local clock and the estimated global NTP time( time of servers with * or + on the NTP status)

What I know though is that my time is somewhere between +20/-20 ms of the estimated time. I want better !

Attached Thumbnails
Keep your pc clock synchronized-loopstats.png   Keep your pc clock synchronized-ntpstatus.png  
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  #28 (permalink)
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gomi View Post
...
I want better !

Only one solution for you, a GPS antenna and this.

Success requires no deodorant! (Sun Tzu)
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  #29 (permalink)
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Less expensive and more fun :

Using ntpd, let's do some soldering on a Garmin OEM GP receiver (you need the OEM one because the standard one doesn't give you the PPS pulse)

An NTP Stratum-1 clock usng a GPS 18 LVC and Windows 2000/XP/Windows-7

Max offset : 200s


In Europe we can also use DCF77
Synchronising your network to a Conrad DCF77 receiver


In the meantime, I'm pretty sure 1-10 ms accuracy is attainable only using ntpv4 and time servers. Still fiddling with the settings....

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  #30 (permalink)
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I have been running with NTP for a couple of days now, and I have to say that my clock may or may not be more accurate than it was with D4.

Using D4, it was routinely within 5 ms (based on how much it was adjusted). For me, D4 usually was only moving the clock 1 or 2ms, and never had big adjustments.

Running NTP, the stats summary routinely shows the offset to be up to 50ms off, and it moves around during the day from being on to being off again. Using the GomTimeMeasure comfirmed this, as the delay would move all over the place during the day with NTP (although it was bounded to reasonable values), and with D4 it remained relatively stable. I have let it run for a long time to make sure it was stable, and have used very good local servers.

I know NTP can be better, but I guess I am just pointing out that it may not be.

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