[R-gui] Interfaces between GUIs and R

Philippe,
Byron,

-----Ursprüngliche Nachricht-----
Von: Philippe Grosjean [mailto:phgrosjean@sciviews.org]
Gesendet: Donnerstag, 03. April 2003 09:11
An: Byron Ellis
Cc: R-sig-gui@stat.math.ethz.ch
Betreff: RE: [R-gui] Interfaces between GUIs and R



				R COM Server	SciViews R Plug
communication		synchronous		asynchronous
client implementation	easy (5 methods)	more difficult
(callbacks,...)
speed of execution	++			+
interruptible calc	no			yes
friezes the client(*)	yes			no
concurrent kernels(**)	no			yes

(*)  A single threaded client must wait for the completion of the
calculation with synchronous evaluation, while it can process other code
during evaluation with an asynchronous evaluation
(**) As a consequence, an asynchronous evaluation allows simultaneous
evaluation in different kernels (some kind of parallelization), while
with a
synchronous evaluation one can connect to several kernels, but must
serialize evaluations in these different kernels.

Please let me add some clarifications:

1. Concurrent kernels are also supported by R COM Server.
2. Concurrent evaluation of different expressions in different kernels
  is also supported, but one has to do the asynchronous processing by
  using different threads/processes in the application program. While
  on expression is evaluated, the COM server blocks. But the COM server
  does not restrict your client application to a single thread.
3. Different kernels on the same or on different machines can be utilized
  the same time by the COM server. I assume, this also holds true for
  SciViews.