| | 7 | |
| | 8 | * processed as set of OT guided exposures for Peter & Craig to measure standard deviation in 32x32 pixels cells across the exposures. Maps of this value show the impact of the OT guiding on the data. Quick summary: for most chips, the noise levels are largely consistent with the unguided noise levels. For 5 chips, more than 50% of the devices have substantially elevated noise: from an expected stdev of 14 from read noise and sky noise to values of 50 - 150 electrons of noise. For a few more chips, the impact is smaller (noise levels elevated by 10-20 DN) or come from only a small fraction of the chips. |
| | 9 | * more work on support for modern versions of linux. The full system now builds on both our cluster (with linux packages vintage 2005 - 2008) and my desktop machines (Ubuntu 12.04). Most changes were caused by changes in the languages: gcc has more pedantic warnings, and since we use -Werror, we must address those warnings, and Perl has changed the result of a test ('ref') to include results not previously supplied ('Regexp'). There is also an issue with the linking options for gcc which I believe is actually a bug (symbols not found in libraries regardless of the link order). |
| | 10 | * Telecon with Scott Michael of Indiana University re: Data Capacitor. We are now getting at least 3Gb/sec to their cluster, and we should be able to start putting data onto their system. We can put large amounts (~1PB or more) onto their tape-based archive for long term (~infinite), but we need to be a bit careful about how this is seen by our system. We can also buffer a smaller amount (10s of TB) for shorter periods (2-4 months) on spinning disk with high availability. |
