Allocating largest buffer without using swap

Question

In C/C++ under Linux, I need to allocate a large (several gigabyte) block of memory, in order to store real-time data from a sensor connected to the ethernet port and streaming

Answer 1

If the computer system is dedicated to receiving data from your sensor, you can simply disable swap. Then allocate as big buffer as you can, leaving enough memory in the system only for essential tools.