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Entry  Thu Feb 28 16:19:37 2008, josephb, Configuration, Computers, Mafalda rewired and multiple cameras running 
    Reply  Thu Feb 28 19:37:41 2008, rob, Configuration, Computers, multiple cameras running and seisBLRMS 
Message ID: 345     Entry time: Thu Feb 28 16:19:37 2008     Reply to this: 346
Author: josephb 
Type: Configuration 
Category: Computers 
Subject: Mafalda rewired and multiple cameras running 
1) Mafalda is now connected via an orange Cat5E ethernet cord to the gigabit ethernet switch in rack in the office space. It has been labeled at both ends with "mafalda".

2) Both the GC650M camera (from MIT) and the GC750M are working. I can run the sampleviewer code and get images simultaneously. Unforutnately, the fps on both cameras seems to drop roughly in half (not an exact measurement) when displaying both simultaneously at full resolution.

3)Discovered the Gigabit ethernet card in Mafalda doesn't support jumbo packets (packets of up to 9k bytes), which is what they recommend for optimum speed.

4)However, connecting the cameras through only gigabit switches to Mafalda did seem to increase the data rate anyways, roughly by a factor of 2. (Used to take about 80 seconds to get 1000 frames saved, now takes roughly 40 seconds).

5)Need to determine the bottleneck on the cameras. It may be the ethernet card, although its possible to connect multiple gigabit cards to single computer (depending on the number of PCI slots it has). Given the ethernet cards are cheap ($300 for 20) compared to even a single camera (~$800-1500), it might be worth while outfitting a computer with multiple.
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