Method for porting a single-core control software to a multi-core control device or for optimizing a multi-core control software

A method for porting an existing vehicle control software developed for a single-core control device into a modified multi-core control software that can be executed on a multi-core control device,

• wherein the existing vehicle control software comprises numerous repeatedly executable runnables, and
• wherein information is exchanged between the runnables through writing and reading of related communication variables, and
• wherein a modified information exchange via time implicit communication is provided for parallelized runnables in the multi-core control software that is generated by the method, the method comprising:
• analyzing the existing vehicle control software regarding a writer-to-reader cardinality of the information exchange with respect to a related communication variable;
• and
• defining an implementation of the time implicit communication as a function of the determined writer-to-reader cardinality,
• wherein a parallelized execution of a writer-runnable and at least one reader-runnable in a 1-to-n writer-to-reader cardinality is established in the generated multi-core control software and the related communication variable is stored in a separate ring buffer, which is associated to the writer-runnable, and
• wherein a sequential execution of numerous writer-runnables and one reader-runnable in an m-to-1 writer-to-reader cardinality is provided, and
• wherein a separate ring buffer is provided for each of the writer runnables, for storing the related communication variable, and
• wherein it is determined, according to a selection rule, from which of the ring buffers the value of the related communication variable is to be read for each reading access by the reader runnable.

A method for porting an existing vehicle control software developed for a single-core control device into a modified multi-core control software that can be executed on a multi-core control device,

• wherein the existing vehicle control software comprises numerous repeatedly executable runnables, and
• wherein information is exchanged between the runnables through writing and reading of related communication variables, and
• wherein a modified information exchange via time implicit communication is provided for parallelized runnables in the multi-core control software that is generated by the method, the method comprising:
• analyzing the existing vehicle control software regarding a writer-to-reader cardinality of the information exchange with respect to a related communication variable;
• and
• defining an implementation of the time implicit communication as a function of the determined writer-to-reader cardinality,
• wherein a parallelized execution of a writer-runnable and at least one reader-runnable in a 1-to-n writer-to-reader cardinality is established in the generated multi-core control software, and the related communication variables in the 1-to-n writer-to-reader cardinality are respectively stored in ring buffers, which are separated from each other, each of the ring buffers being assigned to a respective writer-runnable,
• wherein for each ring buffer, precisely one writer runnable is allowed to write the related communication variable and one or more reader runnables are allowed to read the related communication variable, and
• wherein the method further comprises:
• determining periodicities of the executions of the writer runnable and the at least one reader runnable;
• determining ineffective writings, in which no reading can take place due to relationships of the periodicities;
• and
• avoiding the ineffective writings.

A method for porting an existing vehicle control software developed for a single-core control device into a modified multi-core control software that can be executed on a multi-core control device,

• wherein the existing vehicle control software comprises numerous repeatedly executable runnables, and
• wherein information is exchanged between the runnables through writing and reading of related communication variables, and
• wherein a modified information exchange via time implicit communication is provided for parallelized runnables in the multi-core control software that is generated by the method, the method comprising:
• analyzing the existing vehicle control software regarding a writer-to-reader cardinality of the information exchange with respect to a related communication variable;
• and
• defining an implementation of the time implicit communication as a function of the determined writer-to-reader cardinality,
• wherein a parallelized execution of a writer-runnable and at least one reader-runnable in a 1-to-n writer-to-reader cardinality is established in the generated multi-core control software, and the related communication variables in the 1-to-n writer-to-reader cardinality are respectively stored in ring buffers, which are separated from each other, each of the ring buffers being assigned to a respective writer-runnable, and
• wherein a communication scheme is used for the writing and reading of the related communication variables, based on uniform communication cycles, and
• in which:
• a base interval is established, having a specific duration, and each communication cycle lasts as long as the base interval,
• writing accesses can take place at an arbitrary point in time, in order to write a current value of the related communication variable into a field of a ring buffer, and
• for each written value of the related communication variable a specific future communication cycle is established as a publication time and temporal rank,
• wherein the written value is not made available for a reading access before reaching the publication time.

A method for converting an existing vehicle control software, which is already developed for a multi core control device, into an optimized multi-core control software,

• wherein the existing vehicle control software comprises numerous repeatedly executable runnables, and
• wherein information is exchanged between the runnables through writing and reading of related communication variables, and
• wherein a modified information exchange via time implicit communication is provided for parallelized runnables in the multi-core control software that is generated by the method, the method comprising:
• analyzing the existing vehicle control software regarding a writer-to-reader cardinality of the information exchange with respect to a related communication variable;
• and
• defining an implementation of the time implicit communication as a function of the determined writer-to-reader cardinality, wherein:
• a parallelized execution of a writer-runnable and at least one reader-runnable in a 1-to-n writer-to-reader cardinality is established in the generated multi-core control software, and
• the related communication variables in the 1-to-n writer-to-reader cardinality are respectively stored in ring buffers, which are separated from each other, each of the ring buffers being assigned to a respective writer-runnable.

A method for porting an existing vehicle control software developed for a single-core control device into a modified multi-core control software that can be executed on a multi-core control device,

• wherein the existing vehicle control software comprises numerous repeatedly executable runnables, and
• wherein information is exchanged between the runnables through writing and reading of related communication variables, and
• wherein a modified information exchange via time implicit communication is provided for parallelized runnables in the multi-core control software that is generated by the method, the method comprising:
• analyzing the existing vehicle control software regarding a writer-to-reader cardinality of the information exchange with respect to a related communication variable;
• and
• defining an implementation of the time implicit communication as a function of the determined writer-to-reader cardinality,
• wherein a parallelized execution of a writer-runnable and at least one reader-runnable in a 1-to-n writer-to-reader cardinality is established in the generated multi-core control software and a related communication variable is stored in a separate ring buffer, which is associated to the writer-runnable, and
• wherein a parallelized execution of the numerous writer runnables and the one reader runnable in an m-to-1 writer-to-reader cardinality are provided, and
• wherein a separate ring buffer is provided for each writer runnable, for storing the related communication variable, and
• wherein it is determined, according to a selection rule, from which of the ring buffers the value of the communication variable is to be read for each reading access by the reader runnable.