Re: [Boost-users] [Asio] Measuring and improving SSL servier scalability

On 17.08.2015 22:54, Eric Prud'hommeaux wrote:

* Konrad Zemek [2015-08-16 15:57+0200]

...

Hi all,

I've built a few different Asio-based SSL servers in my career, but in my recent project the performance and resource-efficiency was paramount (as it's a library project), so I benchmarked it to make sure.

Long story short, when benchmarking I found out that OpenSSL's error handling is a *very* serious bottleneck when scaling Asio+SSL over multiple threads. This can be "fixed", e.g. by using BoringSSL instead of OpenSSL, as BoringSSL uses thread-local storage for error data instead of locking a global mutex.

As I didn't find any resources discussing bad Asio+SSL multithreaded performance (aside of one or two messages somewhere on this mailing list that complained about the problem; unfortunately I can't seem to find them right now), I've written up my knowledge into a blog post [1]. I believe it might be very useful to anyone who wants to build a multi-threaded SSL server/client on top of Asio.

The 0.11-devel brance of has support for SSL. Any idea how that stacks up?

Some words seem to be missing from this sentence (most notably name of a project); could you clarify? Konrad