[Accessibility] [Fwd: [g-a-devel] Selector interface and CORBA
Peter.Korn at Sun.COM
Fri May 26 10:32:19 PDT 2006
In various discussions about implementing GNOME accessibility, one =
concern that has been commonly and repeatedly raised is about the =
performance of CORBA for IPC. DBUS has been commonly suggested as a =
higher performance mechanism to use.
Frank Duignan completed an analysis of CORBA performance as compared to =
DBUS and DCOP (the KDE/Qt IPC mechanism). His results are interesting.
His summary conclusions:
DCOP is approximately 3 times slower than CORBA
DBUS is approximately 18 times slower than CORBA
This is based on the sample calls he made to void, int, and string =
functions across process boundaries on the same CPU. See his e-mail =
message attached, and his report at =
for more details. Clearly his tests are somewhat simple - they don't =
mimic the more complex interactions and "lengthier conversations" that =
we have in AT-SPI; further complicating factors mean these performance =
numbers likely won't translate directly to an AT-SPI implementation in =
DBUS or DCOP. And there are any number of places we can look to =
optimize IPC performance besides moving from CORBA to DBUS/DCOP/whatever.
Nonetheless, it does suggest that CORBA itself isn't obviously a bad =
choice from a performance perspective...
Sun Microsystems, Inc.
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From: Frank Duignan <frank.duignan at dit.ie>
Subject: [g-a-devel] Selector interface and CORBA performance debate
Date: Fri, 26 May 2006 09:17:38 +0100
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