Stream API latency

[mthornal]

Hi

I'm just wondering what kind of latency to expect in the Stream API. I've subscribed to the market change subscription and when I read the stream I typically see a 1.3 second difference between the time in the pt field of the message and the time now according to my PCs clock. Is this what I should expect and what others see?

Thanks
Martin

[LetsGo]

I've been using Streaming for over a year and haven't had any problems with latency. I'm not sure what you mean with 'pt field'?

[mthornal]

The "pt field" is the publish time sent with every change message. It's the number of milliseconds since 1970-01-01T00:00:00. When I compare the value in a change message with the current number of milliseconds since that date the difference is usually (although it does vary) around 1300 i.e. 1.3 seconds. Just wondering what others normally see in case it's a problem in my code/language/home network/broadband etc.

[LetsGo]

Running some tests in the Visual Studio c# debug mode on my local PC, I found a delay of about 2 seconds, I run my live programs on an Azure service.
I'll try some tests on the live server later in the week, I would like to know what the latency is with streaming, thanks for pointing this out.

Here are my results:-

	Hour	Min	Sec	Mill		Delay
Test 1						01:59
pt	16	11	2	386
DateTime.UtcNow	16	11	3	327
Test 2						01:46
pt	16	13	47	145
DateTime.UtcNow	16	13	48	99
Test 3						01:54
pt	16	16	56	210
DateTime.UtcNow	16	16	57	156
Test 4						01:54
pt	16	20	0	654
DateTime.UtcNow	16	20	1	600

[LiamP]

Your clock is wrong or the data is being conflated, is the conflate flag true?

[LetsGo]

Your clock is wrong or the data is being conflated, is the conflate flag true?

You may be correct, just checked my local pc time against the https://time.is/GMT site and I'm a second slow.
I'll try the test again tomorrow when the racing is back on.

[mthornal]

Your clock is wrong or the data is being conflated, is the conflate flag true?

Yep, the computer clock hadn't been updated and had drifted out. Just forced a synchronization and it's now showing a latency of around 40ms. Thanks!