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Re: Libcurl: Using libcurl, is it possible to create a list of GET requests for the same easy handle?

From: Daniel Stenberg <>
Date: Thu, 18 Sep 2014 12:28:23 +0200 (CEST)

On Thu, 18 Sep 2014, nikhil ap wrote:

> Set up 5000 concurrent connections and vary the request rate from 5000 to
> 50000 requests per second.

libcurl doesn't really expose "connections" in the API, but I guess we can
ignore that for now.

> Assuming I have setup 5000 easy handles and added it to multi interface, in
> the first second, 5000 GET requests will be sent.


> In the next second, using the same 5000 handles, I would like to send 10000
> GET requests.

Why "using the same 5000 handles" ? Sure, if all those 5000 are already
completed then sure you can reuse them but I would guess than some of those
transfers aren't completed in a second so you need to create and use more
handles while the previous ones are finishing up.

> This means 2 requests should be pipelined and sent in a single handle.

Not exactly. The second request could possibly be pipelined on an existing
connection if you have that enabled, but the second request needs its own easy
handle. There's a one-to-one mapping between transfers and easy handles. The
second GET in a pipelined connection is still a separate transfer and thus it
is made with a separate easy handle. The multi handle is what keeps track of
all connections and all possible pipelines.

> In the third second, I would like to send 15000 which would have piplined 3
> requests and so on.

Again, you then need 15000 unused easy handles to take care of those 15000
transfers. Some of them may then end up being done pipelined, some of them may

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Received on 2014-09-18