[Spice-devel] Is it possible to put spice channels into different threads?

[Marc-André Lureau]

Hi

On Fri, Jun 12, 2020 at 12:57 PM 陈炤 <qishiyexu2 at 126.com> wrote:

> Hi,
>
> Spice-gtk is now using co-routine to handle different channel connections.
> When a channel is handling data, other channels would have to wait, rather
> than handling synchronously.  That would bring us following issues:
>  1. If some less important channels (like usb channels) are transfering
> big data, important channels (main-channel, display-channel,input-channel)
> will be affected.
>  2. When receiving big data like file transfering(G_IO_IN), send event
> (G_IO_OUT) will not be triggered.
>  3. Flow control between different channels will be hard to do.
>
> Is is possible(and make sense) to put channels into different threads so
> they can synchronously receive & send msg, without affect each other?
>
>
Switching to threads would be possible, but that wouldn't help in the
situation you describe, as you are very likely bound on IO. Using several
threads would actually create more problems to synchronize and schedule the
different channels.

Io operations in coroutines are non-blocking, so they shouldn't affect
other spice-gtk task. If you however observe a blocking CPU-task in some
channel, this may affect the performance of other channels. But in general,
except for video/image decoding which may be done in a separate thread, the
client side doesn't do much work.

USB, clipboard and file sharing may use large amounts of data, and we rely
on the glib source and kernel to prioritize channels: this isn't great in
some cases and may receive improvements.


-- 
Marc-André Lureau
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/spice-devel/attachments/20200612/9b4cd10e/attachment.htm>