I am asked to develop a transport client that use gnutls (I am using 3.4.1).
Also I want to simulate more number of such tls clients .
In my application each client is a separate process.
My each process dynamically links with the gmp,nettle and gnutls libs.
Without tls I am able to easily simulate more than 10k connections(with tcp/udp) in my machine(of 8 gb RAM).
But with tls in place I am not able to simulate more than 800 connections. Memory is getting dried up, and is a big concern for me.
I ran with Valgrind memory check tool and I see zero errors and zero warnings.
Can anyone please help me what care I should take while building the gnutls, so that it is optimized and can be made best possible use.
You can make use of callgrind to profile and see if any api in gnutls is called repeatedly. Though this looks an old one, but you can find how callgrind was used to find the issue.