Hi thierry
I think that if we would have a tool to show us the activity I'm quite
sure that we would find bugs
or mistaken behavior.
could you send the scripts you did?
Stef
Le 30/8/16 à 22:36, Thierry Goubier a écrit :
Numbers for the discussion:
No activity, empty desktop:
announcements 608/minute
subscribe add/remove 9/minute
Activity, AltBrowser:
announcements 1109/minute
subscribe add/remove 207/minute
Activity, Nautilus:
announcements 2488/minute
subscribe add/remove 716/minute
Empirically the same processus in both environments: open two system
browser, in one, find the Announcer class, browse through a few of the
methods, select basicSubscribe: and ask for senders.
Tracing done with Metalinks during one minute.
Not exactly what I would have expected, especially the ratio subscribe
add/remove and announcements.
Thierry
Le 30/08/2016 à 17:36, Henrik Johansen a écrit :
On 30 Aug 2016, at 5:16 , Thierry Goubier
<[email protected]> wrote:
I have the same concern with an Announcer optimized for certain use
cases, in the fact that the announcer creator is the one choosing
the 'kind of' optimisation it would target, hoping that the
listeners will conform to that use case...
There simply is no silver bullet that will give unbeatable
performance in all scenarios; and focusing on improving one facet of
the default implementation will inevitably lead to either - the loss
of some important property (general thread-safety if removing the
mutex protection, ability to unsubscribe in handler if removing the
copy operation and extending the delivery mutex protection, etc.) -
greatly degenerated performance for another facet (like #remove for
OC's).
That said, the current implementation is very geared towards decent,
balanced subscribe/unsubscribe performance, at the expense of
delivery speed. I've said it before, and still think, that offering
at least one other implementation emphasizing delivery speed over
subscription/unsubscription performance, in the same way the original
implementation did (and/or changing the default Announcer to switch
between the two dynamically based on heuristics) *would* be a
valuable addition to the general library.
Cheers, Henry
