[winswitch] Using Xpra on multi-GPU laptops

[Antoine Martin]

(....)
> Here's the current release: http://youtu.be/b7pEEErvnAI
>
> Still can't figure out how to increase screen updates.
I have just added support for mmap memory transfers in svn:
http://xpra.org/trac/changeset/273
Since your server and client are on the same machine, you can take
advantage of this to get a higher refresh rate (and lower CPU usage)
with "--enable-mmap" on both client and server.

Testing with various fast screen updating workloads showed a CPU load
reduction of 20% to 50% for the xpra process.

The next step will be to dynamically tune the damage batching to keep
the mmap buffer (almost) full at all times, in the meantime you probably
want to reduce it yourself, ie:
MAX_EVENTS = 100
or even turn batching off completely:
BATCH_EVENTS = False

Cheers
Antoine

>
> - Eric
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