Not logged in
Thu Feb 28 16:19:37 2008, josephb, Configuration, Computers, Mafalda rewired and multiple cameras running
Thu Feb 28 19:37:41 2008, rob, Configuration, Computers, multiple cameras running and seisBLRMS
Thu Feb 28 19:37:41 2008
In reply to:
multiple cameras running and seisBLRMS
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.
I found the SampleViewer running and displaying images from the two cameras. This kept mafalda's network so busy that the seisBLRMS program fell behind by a half-hour from its nominal delay (so 45 minutes instead of 12), and was probably getting steadily further behind. I killed the SampleViewer display on linux2, and seisBLRMS is catching up.