Experimental Physics and
Industrial Control System

On 16.09.2011 23:30, Matt Newville wrote:
>> PS:
>> Is there a difference between a connection to 50K Pvs versus, 50K connections to the same PVs?
> Yes, these are definitely different.

It all depends:
If the 50K PVs reside on 50K different IOCs, the name resolution answers
will come in 50K separate UDP packets, and the client will subsequently
have to open 50K TCP connections and start 100K threads.
If the 50K PVs reside on one IOC, name resolution answers will be in
only few packets, and only one TCP connection with two threads is used
for all data traffic, so the difference to connecting to the same PV 50K
times is rather marginal.

~Ralph

References:

How to write a python-based backpup tool? emmanuel_mayssat

Re: How to write a python-based backpup tool? Matt Newville

Re: How to write a python-based backpup tool? emmanuel_mayssat

Re: How to write a python-based backpup tool? Matt Newville

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