40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Message ID: 386     Entry time: Thu Mar 20 16:06:27 2008
Author: rob 
Type: Configuration 
Category: LSC 
Subject: LSC code change 

I changed the LSC code again. I noticed that when turning off the LSC (e.g., going from LA to OFF), the cpu time would jump from ~50 to ~80, and irrevocably de-sync all the SUS controllers. This was because turning off the LSC would suddenly zero the inputs to the decimation filters that send information to the ASS box, which for some reason greatly increases the computation time of the iir filter function call. I changed the code so that these inputs are never zeroed. The ASS receives inputs from the LSC all the time now.

I also noticed that the ASS machine was running in ~2400 usec. Yes, 2,400 microseconds. I don't know how long it's been doing that, but I restarted it. Immediately after restart, it ran at 1700 microseconds. After using the "RESET" field in the adaptOnline code, that dropped to ~100 usec. Now it's not doing any adaptive filtering, as I don't know what the good settings are and no-one has been elogging their IFO work the last few days.
ELOG V3.1.3-