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master
Marc Alexander Lehmann 12 years ago
parent
commit
8bf65cce82
3 changed files with 12 additions and 8 deletions
  1. +5
    -3
      Changes
  2. +2
    -1
      ev.c
  3. +5
    -4
      ev.pod

+ 5
- 3
Changes View File

@ -1,8 +1,10 @@
Revision history for libev, a high-performance and full-featured event loop.
- use 1-based heaps, simplifies code, reduces codesize, makes
for better cache-efficiency and increases memory requirements
by up to two pointers/loop.
- use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
codesize and makes for better cache-efficiency.
- use 3-based 4-heap for !EV_MINIMAL. this makes better use
of cpu cache lines and gives better growth behaviour than
2-based heaps.
- fix a potential aliasing issue in ev_timer_again.
- add/document ev_periodic_at, retract direct access to ->at.
- improve ev_stat docs.


+ 2
- 1
ev.c View File

@ -810,6 +810,7 @@ downheap (WT *heap, int N, int k)
// find minimum child
if (expect_true (pos +3 < E))
{
/* fast path */
(minpos = pos + 0), (minat = (*minpos)->at);
if (pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
if (pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
@ -817,9 +818,9 @@ downheap (WT *heap, int N, int k)
}
else
{
/* slow path */
if (pos >= E)
break;
(minpos = pos + 0), (minat = (*minpos)->at);
if (pos + 1 < E && pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
if (pos + 2 < E && pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);


+ 5
- 4
ev.pod View File

@ -2982,8 +2982,9 @@ defined to be C<0>, then they are not.
=item EV_MINIMAL
If you need to shave off some kilobytes of code at the expense of some
speed, define this symbol to C<1>. Currently only used for gcc to override
some inlining decisions, saves roughly 30% codesize of amd64.
speed, define this symbol to C<1>. Currently this is used to override some
inlining decisions, saves roughly 30% codesize of amd64. It also selects a
much smaller 2-heap for timer management over the default 4-heap.
=item EV_PID_HASHSIZE
@ -3178,8 +3179,8 @@ have many watchers waiting for the same fd or signal).
=item Finding the next timer in each loop iteration: O(1)
By virtue of using a binary heap, the next timer is always found at the
beginning of the storage array.
By virtue of using a binary or 4-heap, the next timer is always found at a
fixed position in the storage array.
=item Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd)


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