Changeset 6866 for trunk/psphot/doc/notes.txt

Timestamp:

Apr 17, 2006, 7:24:11 AM (20 years ago)

Author:

eugene

Message:

adjustments for improved speed

File:

• trunk/psphot/doc/notes.txt (modified) (1 diff)

trunk/psphot/doc/notes.txt

@@ +1 @@
+
+2006.04.16
+
+  Examining some of the throughput issues.  the flux measurement speed
+  is strongly dependent on the interation of the function step size:
+
+  dz = 0.01 : 3.24s for 4400 objects
+  dz = 0.1  : 0.44s for 4400 objects
+
+  there is an increased error in the result with the larger step size,
+  but it is smaller than the phot error.  Still, we could do better
+  with a smarter integration function.
+
+  Including the aperture photometry on all sources, but not the
+  pixWeight, the source magnitudes takes 4.8 sec for 4400 objects.
+
+  Adding the pixWeight increases the time to 7.5 sec for 4400 objects
 
 2006.02.12