Performance optimization device of memory system and operating method thereof

A performance optimization device of a memory system, comprising:

• a storage memory for storing N candidate performance parameter values for a performance parameter of the memory system, where N is a natural number;
• and
• a computing processor for calculating N objective function results for an objective function defined for the memory system and determining an additional candidate performance parameter value for the performance parameter of the memory system, based on the N candidate performance parameter values and the N objective function results,
• wherein each of the N objective function results is a result of the objective function, the result being measured when a corresponding one of the candidate performance parameter values is applied to the memory system, and
• wherein the objective function is a function of an average of a plurality of latencies required for the memory system to process a plurality of commands received from an external device and a maximum value of the plurality of latencies.

A memory controller, comprising:

• a working memory for storing N candidate performance parameter values for a performance parameter of a memory system including the memory controller, where N is a natural number;
• and
• a processor for calculating N objective function results for an objective function defined for the memory system and determining an additional candidate performance parameter value for the performance parameter of the memory system, based on the N candidate performance parameter values and the N objective function results,
• wherein each of the N objective function results is a result of the objective function, the result being measured when a corresponding one of the candidate performance parameter values is applied to the memory system, and
• wherein the objective function is a function of an average of a plurality of latencies required for the memory system to process a plurality of commands received from an external device and a maximum value of the plurality of latencies.

A method of optimizing a system, the method comprising:

• modeling an object function of the system based on measured results and selected values of a parameter, the object function being expressed as a following equation and the measured results being obtained by measuring a performance of the system that is set to the respective selected values;
• obtaining a probability distribution for the parameter by applying a probabilistic model on the object function;
• determining an acquisition function based on the probability distribution;
• estimating an additional value of the parameter through the acquisition function;
• and
• determining an optimal value of the parameter from among the selected value and the additional value based on the measured results and an additional result obtained by measuring the performance of the system that is set to the additional value.
• OBJ_FUNC(X)=W1*THROUGHPUT+W2*MAX_LATENCY, [Equation]
• where “OBJ_FUNC( )” represents the object function, “X” represents the parameter, “W1” and “W2” represent predetermined weights, “THROUGHPUT” represents a throughput of the system and is inversely proportional to an average of latencies respectively for a predetermined number of commands provided to the system and “MAX_LATENCY” represents a greatest one of the latencies.