Cleanup of array sorter interface and added quicksplit.

[libucw.git] / lib / sorter / TODO

diff --git a/lib/sorter/TODO b/lib/sorter/TODO
index b0417ad76e5309ae87fdaf4c074745fdb9e552ae..f4a802cacbceb191459a33a6bcd864a95aab51e6 100644 (file)
--- a/lib/sorter/TODO
+++ b/lib/sorter/TODO
@@ -4,15 +4,12 @@ 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.
 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  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?
+o  Log messages should show both original and new size of the data. The speed
+   should be probably calculated from the former.