GLAST Large Area Telescope

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Presentation transcript:

GLAST Large Area Telescope Gamma-ray Large Area Space Telescope GLAST Large Area Telescope Monthly Mission Review LAT Flight Software Status July 12, 2007 Jana Thayer Stanford Linear Accelerator Center

FSW - Overall Status FQTB completed B1-0-1 upload/regression in progress…

FQTB completed All remaining FSW requirements sold off GRB detection algorithm 5.3.10.2.1 GRB Location Accuracy 5.3.10.2.2 Modification of GRB criteria 5.3.11.3.3 Process Attitude Data 5.3.11.6 GRB Alert Message Latency 5.3.11.7 LAT GRB Repoint Request Message to SC FSW Standards 5.4.1 System of Units (metric system) 5.4.2.x Coordinate Systems (3 requirements) 5.4.3 Resource Margin

B1-0-1 has arrived! Build contents relative to B0-9-0*: GRB algorithm and updates to LAT-GBM interface LCI bug correction Updates to LIM, LATC, event filter, compression Additional monitoring of LAT configuration and CPU performance through housekeeping Regression testing of B1-0-1 on Testbed is complete Standard FSW regression test suite was successful Tested portions of LAT CPT using LICOS in dataflow lab Calibration runs Physics data acquisition runs * Full list of changes available in JIRA

B1-0-1 upload/regression: 7/11/07 11:48 PM B1-0-1 upload started at 5 PM MST on Wednesday, 7-11-07 In progress SIU1 and EPU0 completed No regression tests performed on the LAT yet…

Write-back vs. write-through modes LAT responds to a flag in the secondary boot command to boot in either write-back or write-through mode Write-back mode Nominal mode for on-orbit operations Write-through Ensures cache coherency to capture non-stale information after a watchdog reboot Only useful for watchdog reboots not exception or panic reboots CPU usage is not optimized for running in this mode Approximate factor of 3 hit in CPU performance Why are we operating in write-through mode in the first place? When EMI began, LAT had only 200 reboot-free hours since fix was installed Watchdog reboots represented majority of spontaneous reboots Write-through mode leaves breadcrumbs in case of a watchdog reboot, but comes with a penalty in CPU performance Switch to write-back (nominal) mode for CPT and all future tests 400+ reboot-free hours since reboot fix was installed “Clean break”: EMI is complete CPT next week is an opportunity to get a new baseline in the nominal running mode Since mode is commandable, it requires no effort to switch to write-back

JIRA Metrics as of 11 July 2007 Open issues are divided as follows 22 items approved for B1-0-1 that were not complete in time for the build 16 items associated with a single housekeeping JIRA; split into 16 for tracking purposes 2 JIRAs dealing with configurations and/or ground software changes Of the 4 remaining, only one is crucial – addition of event summary statistics 16 planned for B2-0-0 (post L+60) 13 deferred indefinitely 2 being investigated 3 on FSW CCB agenda

Backup GLAST Large Area Telescope Monthly Mission Review Gamma-ray Large Area Space Telescope GLAST Large Area Telescope Monthly Mission Review Backup Stanford Linear Accelerator Center

B1-0-1 leftovers Configuration file changes Addition to housekeeping – tracked as individual JIRAs B1-0-1 leftovers Key Summary FSW-305 Summary/statistics telemetry stream needs to be created for on-board event processors FSW-806 Revisit rate counter implementation FSW-789 LCI event data is inconsistent if TEM errors or diagnostics present FSW-582 Capture of layer splits in LATC does not consider the FE mode registers FSW-938 LMC Delta timestamp telemetry field description is incorrect FSW-917 Implement the filter parameters described in TD-08805-01 FSW-948 Add LPA_DB instance ID to housekeeping FSW-946 Add LATC info to housekeeping telemetry FSW-950 Add GRB GBM and EPU states in housekeeping FSW-949 Add default values of LATC, LPA_DB and LATC ignore files for physics acquisitions to housekeeping FSW-947 Add LCI program file ID to housekeeping FSW-945 Add PDU/GASU power and CRU Configuration register info to housekeeping FSW-944 Add LHK configuration files in use to housekeeping FSW-943 Put LRA in charge of tracking GEM sent, prescaled, discarded, livetime, deadzone for housekeeping FSW-942 Add simulating/not simulating info for THS time tone and time hack to housekeeping FSW-941 Add memory scrub info to housekeeping FSW-918 Include Run ID in housekeeping FSW-934 Add telemetry to report on LAT power state and state/configuration of physics data acquisition FSW-951 Add "dirty" flag in housekeeping to indicate non-nominal configuration change FSW-939 Add LTC configuration file ID to housekeeping