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

Subject: Re: [Boost-users] [Asio] Measuring and improving SSL servier scalability
From: Eric Prud'hommeaux (eric_at_[hidden])
Date: 2015-08-17 16:54:37

* Konrad Zemek <konrad.zemek_at_[hidden]> [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?

> Konrad
> 
> [1] https://konradzemek.com/2015/08/16/asio-ssl-and-scalability/
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