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»Forums Index »Product Support »DTN.IQ Client Software Support »Performance with multiple socket clients to IQconnect.exe
Author Topic: Performance with multiple socket clients to IQconnect.exe (2 messages, Page 1 of 1)

mvo
-Interested User-
Posts: 8
Joined: Apr 8, 2009


Posted: Aug 4, 2011 08:19 PM          Msg. 1 of 2
Hi,
How much extra CPU and network traffic overhead is added when I connect two (as opposed to one) instances of my socket-based application to IQconnect? Both instances are requesting the identical data in terms of the ticker list and dynamic fields.
I tried that a couple days ago and didn't see any noticeable increase in CPU utilization - just want to confirm my observation. CPU stayed at around 15% for 1300 tickers.

What happens if second app is requesting the same fields as the first app plus some more? Will IQconnect be delivering just a single superset of two requested subsets and then distribute whatever is requested by each or will it stream over the Internet two separate sub-feeds for two clients?

Thanks

DTN Brian Wood
-Interested User-
Posts: 17
Joined: Jun 2, 2004


Posted: Aug 5, 2011 10:38 AM          Msg. 2 of 2
You should be able to make multiple socket connections to IQFeed, as long as they are all on the same machine. IQFeed is designed to have multiple socket connections and applications connected to it.

In IQFeed, the minimal number of connections needed is made to the DTN servers. The communications to the server is compressed binary to minimize traffic over the internet. IQFeed maintains its own internal symbol, data, and client lists, and then sends out the data as needed by the clients to minimize duplication of data.

Adding a second client watching the same data just adds a little overhead of sending out an update to two or more socket connections instead of one, which shouldn't affect IQFeed an extra lot. The data is received once from the servers and then just sent out as much as needed by the client applications.

The more symbols you watch and the more clients you have running or additional socket connections you maintain to IQFeed, the more efficient your application code might need to be to run well.

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