On Mon, Oct 15, 2012 at 08:52:03PM -0700, Ben Pfaff wrote:
I did a little bit of research tonight after thinking about our
IRC conversation about when it takes a long time to compose
selection data for a clipboard response. I modified the function
that responds to a clipboard request to printf a message, and
then tried a few clipboard copies with two different clipboard
managers running (Parcellite and Diodon) and with no clipboard
manager running.
Parcellite's behavior surprised me. Twice a second, it requests
a new copy of the primary selection from whatever app owns it.
If an app has a big selection, it essentially DOSes the machine.
Diodon seems a little better. It appeared to request the
selection three times (three formats? didn't check) and then
stops.
Without a clipboard manager, there's no problem.
None of the above surprises me. Clipboard "managers" cause problems
as you have discovered.
Gnumeric doesn't handle large copy/cut/paste particularly well
either. It's easy to induce long pauses (seconds, maybe tens of
seconds?) with a few hundred thousand cells.
Does this happen going in both directions, or only in one? And is
the bottleneck in the Gnumeric side or the Psppire side?
At the end of the day, I would never encourage anyone to make large
cut and pastes. Not only because of the performance issue, but also
because it is so easy to inadvertently and unwittingly select the
wrong cells - leading to data getting dropped or duplicated without
anyone realising it.
The clipboards (both PRIMARY and CLIPBOARD) are IMO a convenience
feature designed to be used for quick transfer of small amounts of
data between applications. The clipboards need to be able to
generate text and html so that they can be pasted to spreadsheets
and to text editors. The code in master does this quite well I
think, so can probably be reused for the psppsheet branch.
J'
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