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Diffstat (limited to 'ev.pod')
| -rw-r--r-- | ev.pod | 22 |
1 files changed, 22 insertions, 0 deletions
@@ -3001,6 +3001,28 @@ usually more than enough. If you need to manage thousands of C<ev_stat> watchers you might want to increase this value (I<must> be a power of two). +=item EV_USE_4HEAP + +Heaps are not very cache-efficient. To improve the cache-efficiency of the +timer and periodics heap, libev uses a 4-heap when this symbol is defined +to C<1>. The 4-heap uses more complicated (longer) code but has a +noticable after performance with many (thousands) of watchers. + +The default is C<1> unless C<EV_MINIMAL> is set in which case it is C<0> +(disabled). + +=item EV_HEAP_CACHE_AT + +Heaps are not very cache-efficient. To improve the cache-efficiency of the +timer and periodics heap, libev can cache the timestamp (I<at>) within +the heap structure (selected by defining C<EV_HEAP_CACHE_AT> to C<1>), +which uses 8-12 bytes more per watcher and a few hundred bytes more code, +but avoids random read accesses on heap changes. This noticably improves +performance noticably with with many (hundreds) of watchers. + +The default is C<1> unless C<EV_MINIMAL> is set in which case it is C<0> +(disabled). + =item EV_COMMON By default, all watchers have a C<void *data> member. By redefining |