On Mon, 23 Jun 2014, Richard W.M. Jones wrote:
(had to handicraft the reply due to unimportant stuff, so this reply may not
be threaded as nicely as it should've been)
On Mon, Jun 23, 2014 at 10:44:17AM +0100, Richard W.M. Jones wrote:
Can a single cURL handle be "switched" between reading and uploading?
And if so, how do you do that?
Or should the plugin open two handles (one for reading, one for
writing)?
Or a third option: Should the plugin open a new cURL handle for every
request?
Or a fourth: Keep open a collection of cURL handles? (And if so, what
policy to use to decide when to open a new handle or close an old one?)
Note that NBD pread & pwrite requests are generally quite small, frequent,
and of course unpredictable in both size, frequency and order.
A curl handle can be re-used for any amount of requests so a read (download)
request can very well be followed by a write (upload) request. But they are
then two subsequent requests and you can't just switch at will at a random
point in time.
As I don't really know what you'd use the writing and reading for, I don't
think I can advice very good here.
A general rule is that curl handles should be kept around and re-used for
subsequent requests as much as possible for best performance.
--
/ daniel.haxx.se
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