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> On Mon, Nov 09, 2009 at 05:34:12PM +0000, Edward
> Hibbert wrote:
>
> > For HTTP connections, I can get about 20K
> connections and outstanding requests in 116MB,
> which is pretty respectable.
> >
> > However with HTTPS, what I see is that:
> > - having the connection open takes 261MB for
> about 16K connections
> > - having the connection open with an outstanding
> request takes about 1GB for 10L connections.

Using the OpenSSL 1.0 (thanks for the suggestion, Cliff) there's a significant drop in occupancy.
- 16K open connections now takes ~277MB (noise level difference from previous measurement)
- 16K connections with the outstanding GET request now takes ~1GB (down from estimated 1.6GB previously)

So there's still a massive occupancy cost of having an outstanding GET request in the HTTPS case, which is surprising. Looks like I'd better roll my sleeves up and dig into the code.

Edward.