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»Forums Index »IQFeed Developer »IQFeed Developer Support »Historical requests - speed of retrieval
Author Topic: Historical requests - speed of retrieval (5 messages, Page 1 of 1)

fredericf
-Interested User-
Posts: 13
Joined: Aug 1, 2018


Posted: Sep 21, 2018 02:18 AM          Msg. 1 of 5
Hi Tim,

When making requests for historical data, I pack my requests all in one (let's say 50 requests in the same string, separated by \n) and I send it over to IQFeed.

I then receive the 50 answers, one by one, approximately 0.5 sec apart from each other. So it takes about 20 seconds to receive the 50 answers.

Q: Is such a speed normal?

I find it rather slow compared to what we can receive with the live feed.

Q: Is there any way to speed it up?

Thanks!

Frederic

DTN_Tim Walter
-DTN Guru-
Posts: 1238
Joined: Apr 25, 2006


Posted: Sep 21, 2018 03:32 AM          Msg. 2 of 5
Hi Frederic,

If you create 15 sockets, then you can do 15 requests at any 1 time which should get you down to just a few seconds.15 is the maximum number of history requests we allow at any 1 time.

Tim

fredericf
-Interested User-
Posts: 13
Joined: Aug 1, 2018


Posted: Sep 21, 2018 06:06 AM          Msg. 3 of 5
So, I understand the transfer speed I am experiencing is normal, and multiple sockets is the way to go to make it higher. Reducing retrieval time by a factor 15 would be very nice indeed!

I have not managed multiple sockets before, I will look into this asap.

Thank you for the very useful answer!

Frederic

DTN_Tim Walter
-DTN Guru-
Posts: 1238
Joined: Apr 25, 2006


Posted: Sep 21, 2018 07:19 AM          Msg. 4 of 5
Happy to.

Butm yes that is normal, the requests happen in line, they are not sent in as a batch. So you have a lot of extra transfer latency dragging things down on top of the sequential processing.

Tim

fredericf
-Interested User-
Posts: 13
Joined: Aug 1, 2018


Posted: Sep 21, 2018 02:02 PM          Msg. 5 of 5
This makes sense.

Have a nice weekend!

Frederic
 

 

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