X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;f=lib%2Fsorter%2FTODO;h=c2b653d5b96f4b2e5a3861befdb1cbbeddc88cd8;hb=90afcc18dbf7cb6c682e1efb994007f03e304422;hp=5b848ef0557c5ff5196d251e50507e8db1772a35;hpb=df047d308d980b9822ed05230cc3dbbafc28da0b;p=libucw.git

diff --git a/lib/sorter/TODO b/lib/sorter/TODO
index 5b848ef0..c2b653d5 100644
--- a/lib/sorter/TODO
+++ b/lib/sorter/TODO
@@ -3,17 +3,22 @@ o  Giant runs.
 o  Records of odd lengths.
 o  Empty files.
 
-Improvements:
-o  Alignment? Use of SSE?
-o  Use radix-sort for internal sorting.
-o  Parallelization of internal sorting.
+Cleanups:
 o  Clean up data types and make sure they cannot overflow. (size_t vs. u64 vs. sh_off_t vs. uns)
-o  Buffer sizing in internal sorters.
-o  Switching between direct and normal I/O.
-o  When merging, choose the output file with less runs instead of always switching?
-o  Implement multi-way merge.
-o  Mode with only 2-way unification?
-o  Speed up 2-way merge.
-o  Speed up radix splitting.
-o  A debug switch for disabling the presorter.
-o  Deal with too rough range estimates in radix splitting.
+o  Clean up log levels.
+o  Clean up introductory comments.
+o  Log messages should show both original and new size of the data. The speed
+   should be probably calculated from the former.
+o  Automatically tune ASORT_MIN_RADIX, ASORT_MIN_SHIFT and especially ASORT_RADIX_BITS.
+o  Buffer sizing in shep-export.
+
+Improvements:
+o  Switching between direct and normal I/O. Should use normal I/O if the input is small enough.
+o  How does the speed of radix splitting decrease with increasing number of hash bits?
+   Does it help to use more bits than we need, so that we sort less data in memory?
+
+Users of lib/sorter/array.h which might use radix-sorting:
+indexer/chewer.c
+indexer/lexfreq.c
+indexer/mkgraph.c
+indexer/reftexts.c