Method for generating program and method for operating system

A method for generating a program generated by an information processing apparatus and executed by a processor including an internal memory and a cache memory in which the program is stored, the method comprising:

• executing a source program including a plurality of functions having a hierarchy structure, and sequentially selecting a function whose cache miss penalty is larger than cache miss penalties of other functions as a selected function that is to be stored in the internal memory;
• allocating the selected function to a memory area of the internal memory, allocating a function that is not the selected function and is called from the selected function to an area close to the memory area of the internal memory, and generating an internal load module;
• and
• allocating a remaining function to an external memory coupled to the processor and generating an external load module.

A method for generating a program generated by an information processing apparatus and executed by a plurality of processors, the method comprising:

• executing a source program including a plurality of functions having a hierarchy structure and sequentially selecting a function whose execution frequency is higher than execution frequencies of other functions as a selected function that is to be stored in an internal memory of one of the processors;
• allocating the selected function to a memory area of the internal memory, allocating a function that is not the selected function and is called from the selected function to an area close to the memory area of the internal memory, and generating an internal load module that is to be executed by one of the processors having the internal memory;
• and
• allocating a remaining function to an external memory coupled to the processors and generating an external load module that is to be executed by another one of the processors other than the one of the processors executing the internal load module.

A method for operating a system including a first processor and at least one second processor including an internal memory in which a program including a plurality of functions having a hierarchy structure is stored, the method comprising:

• holding logs of functions being executed every time the second processor executes the program in response to a start instruction from the first processor;
• selecting by the first processor a function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held, and generating by the first processor a memory image that is to be copied to the internal memory by using the function being selected, prior to a next start instruction from the first processor;
• and
• copying a newly selected function to the internal memory by the second processor in response to the start instruction from the first processor.

A method for operating a system including a first processor and at least one second processor including an internal memory in which a program including a plurality of functions having a hierarchy structure is stored, the method comprising:

• holding logs of functions being executed every time the second processor executes the program in response to a start instruction from the first processor;
• expecting an idle time of the second processor by the first processor;
• when the idle time being expected is longer than a first period, selecting by the second processor a function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held and generating by the second processor a memory image that is to be copied to the internal memory by using the function being selected during the idle time, and copying the memory image being generated to the internal memory by the second processor in response to the start instruction from the first processor;
• and
• when the idle time being expected is equal to or less than the first period, selecting by the second processor the function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held during the idle time, generating by the second processor the memory image that is to be copied to the internal memory by using the function being selected in response to the start instruction from the first processor, and copying the memory image being generated to the internal memory by the second processor.

A system comprising:

• a first processor;
• at least one second processor including an internal memory in which a program including a plurality of functions having a hierarchy structure is stored;
• and
• a log buffer holding logs of functions executed by the second processor, wherein:
• the logs of the functions being executed are held every time the second processor executes the program in response to a start instruction from the first processor;
• the first processor selects a function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held and the first processor generates a memory image that is to be copied to the internal memory by using the function being selected, prior to a next start instruction from the first processor;
• and
• the second processor copies a newly selected function to the internal memory in response to the start instruction from the first processor.

A system comprising:

• a first processor;
• at least one second processor including an internal memory in which a program including a plurality of functions having a hierarchy structure is stored;
• and
• a log buffer holding logs of functions executed by the second processor, wherein:
• the logs of the functions being executed are held every time the second processor executes the program in response to a start instruction from the first processor;
• the first processor expects an idle time of the second processor;
• when the idle time being expected is longer than a first period, the second processor selects a function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held and generates a memory image that is to be copied to the internal memory by using the function being selected during the idle time, and the second processor copies the memory image being generated to the internal memory in response to the start instruction from the first processor;
• and
• when the idle time being expected is equal to or less than the first period, the second processor selects the function whose execution frequency is higher than execution frequencies of other functions based on the logs of the functions being held during the idle time, and the second processor generates the memory image that is to be copied to the internal memory by using the function being selected and copies the memory image being generated to the internal memory in response to the start instruction from the first processor.