PATTERN EXTRACTION APPARATUS, PATTERN EXTRACTION METHOD AND PROGRAM

1 . A pattern extraction apparatus, comprising:

a memory; and

a processor configured to execute:

calculating, on a basis of a history of an execution process of functions of a system, for each of the functions, a total execution count of the function;

identifying the function of which a percentage of the total execution count as to the total execution count of all of the functions or as to a sum of the total execution count is less than a threshold value; and

extracting, from patterns of the execution process, a pattern including the function identified by the identifying, on the basis of the history.

2 . The pattern extraction apparatus according to claim 1 ,

wherein the calculating references information generated on the basis of the history, which indicates, for each of the patterns, an execution count of the pattern and an execution count of each of the functions that the pattern includes, and calculates, for each function, a total execution count of the function, and

wherein the extracting references the information and extracts the pattern including the function identified by the identifying.

3 . A pattern extraction apparatus, comprising:

calculating, on a basis of a history of an execution process of functions of a system, for each of the functions a count of patterns of the execution process including the function;

identifying the function of which a count of the patterns is less than a threshold value; and

extracting, from patterns of the execution process, a pattern including the function identified by the identifying, on the basis of the history.

4 . The pattern extraction apparatus according to claim 1 ,

wherein the extracting performs counting of a count of the functions identified by the identifying included for each of the patterns, and

wherein the processor further executes:

outputting the patterns extracted by the extracting , prioritized on a basis of the count included.

5 . A pattern extraction method executed by a computer including a memory and a processor, the method comprising:

calculating, on a basis of a history of an execution process of functions of a system, a total execution count of the function for each of the functions;

identifying the function of which a percentage of the total execution count as to the total execution count of all of the functions or as to a sum of the total execution count is less than a threshold value; and

extracting, from patterns of the execution process, a pattern including the function identified in the identifying , on the basis of the history.

6 . (canceled)

7 . A non-transitory computer-readable recording medium having computer-readable instructions stored thereon, which when executed, cause a computer to function as the pattern extraction apparatus according to claim 1 .