Changeset 27838 for branches/tap_branches/Ohana/src/relastro/doc/notes.txt

Timestamp:

May 3, 2010, 8:41:49 AM (16 years ago)

Author:

eugene

Message:

updates from trunk

Location:

branches/tap_branches

Files:

• . (modified) (1 prop)
• Ohana (modified) (1 prop)
• Ohana/src/relastro (modified) (1 prop)
• Ohana/src/relastro/doc/notes.txt (modified) (1 diff)

branches/tap_branches/Ohana/src/relastro/doc/notes.txt

@@ +1 @@
+
+2010.03.24
+
+  I have finished only part of the optimizations listed below: I have
+  made the detection->image and image->mosaic lookups use bracket
+  searches.  I have NOT converted the image->mosaic lookups to use the
+  parentID, so these matches are still based on time ranges.  I have
+  also added a bit of positional constraint to the image match
+  function in 'select_images' (comparing Rmax of the sky regions to
+  Rmin of the images).  These have had a huge improvement.  Here is
+  the execution time for the SAS data (~450 images) with the old vs
+  the new code on pikake:
+
+  old : 39min
+  new :  7min
+
+  The bulk of the time for the new code is now disk I/O.
+
+2010.03.23
+
+  I've been working on optimization.  I've updated ImageOps to make
+  the measure->image relationship generation use the image IDs along
+  with a bracket search -- this goes much faster as a result.  More
+  work is needed:
+
+  * select_images needs to apply astrometry to all image corners: 
+    -> cache the image center and radius and use this to narrow down
+       the searches.
+
+  * MosaicOps uses the time to match mosaics.  I've added sorting to
+    speed this up, but this should be done based on the image and
+    parent index.
+
+    -> make a tool to create the parent ID for existing DBs.
+    -> make sure addstar is populating the parent IDs
+    -> use the parent IDs to make the link.
+
+load image data: 0.006347 sec
+  setup sky: 0.091475 sec
+  convert image table: 0.091498 sec
+  select images: 2.925978 sec
+  init images: 2.926957 sec
+  init mosaics: 2.927319 sec
+load images: 2.933762 sec
+load catalog data: 9.772259 sec
+make image bins: 9.780618 sec
+set up image indexes: 10.196519 sec
+
+load image data: 0.006746 sec
+  setup sky: 0.091440 sec
+  convert image table: 0.091467 sec
+  select images: 0.374193 sec
+  init images: 0.375355 sec
+  init mosaics: 0.375753 sec
+load images: 0.382606 sec
+load catalog data: 7.260094 sec
+make image bins: 7.268564 sec
+set up image indexes: 7.687485 sec
+
 
 2008.03.01