Re: [PATCH perl@6962] 2 more vms.c fix-ups and status

[p5sagit/p5-mst-13.2.git] / pod / perldelta.pod

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 97addbf..f3608e9 100644 (file)
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -293,6 +293,17 @@ distribution.
 
 map() that changes the size of the list should now work faster.
 
+=item *
+ 
+sort() has been changed to use mergesort internally as opposed to the
+earlier quicksort.  For very small lists this may result in slightly
+slower sorting times, but in general the speedup should be at least 20%.
+Additional bonuses are that the worst case behaviour of sort() is now
+better (in computer science terms it now runs in time O(N log N), as
+opposed to quicksorts Theta(N**2) worst-case run time behaviour), and
+that sort() is now stable (meaning that elements with identical keys
+will stay ordered as they were before the sort).
+
 =back
 
 =head1 Installation and Configuration Improvements
@@ -796,6 +807,35 @@ made in other platforms.
 
 st-store.t and st-retrieve may fail with Compaq C 6.2 on OpenVMS Alpha 7.2.
 
+=head2 Threads Are Still Experimental
+
+Multithreading is still an experimental feature.  Some platforms
+emit the following message for lib/thr5005
+
+    #
+    # This is a KNOWN FAILURE, and one of the reasons why threading
+    # is still an experimental feature.  It is here to stop people
+    # from deploying threads in production. ;-)
+    #
+ 
+and another known warning is
+
+   pragma/overload......Unbalanced saves: 3 more saves than restores
+   panic: magic_mutexfree during global destruction.
+   ok
+   lib/selfloader.......Unbalanced saves: 3 more saves than restores
+   panic: magic_mutexfree during global destruction.
+   ok
+   lib/st-dclone........Unbalanced saves: 3 more saves than restores
+   panic: magic_mutexfree during global destruction.
+   ok
+
+=head2 The Compiler Suite Is Still Experimental
+
+The compiler suite is slowly getting better but is nowhere near yet.
+The backend part that has seen perhaps the most progress is the
+bytecode compiler.
+
 =back
 
 =head1 Reporting Bugs