Low Latency Best Practices

Disable Logging

Please use this code snippet to disable all logging operations:

// Available only log messages for fatal errors.
settings.logLevel = LogLevel::Fatal;

// Available only logging to file.
settings.logSettings = LogSettings::TraceToFile;

CPU Affinity Mask

Please use this code snippet to set processor affinity mask for receiving thread.

// TCP receiver will run on 2nd processor core
settings.cpuIndex = 1;

Spin-wait Mode

In software engineering, busy-waiting or spinning is a technique in which a process repeatedly checks to see if a condition is true, such as whether keyboard input is available, or if a lock is available. Spinning can also be used to generate an arbitrary time delay, a technique that was necessary on systems that lacked a method of waiting a specific length of time. On modern computers with widely differing processor speeds, spinning as a time delay technique often produces unpredictable results unless code is implemented to determine how quickly the processor can execute a "do nothing" loop.

Spinning timeout can be used for avoiding to enter a kernel mode of the operating system for some time.

Please use this code snippet to set spinning timeout:

// Timeout value in microseconds used for spinning
// before enter a kernel mode of the operating system.
settings.receiveSpinningTimeoutInMicroseconds = 1000;