Distributed processing system with checkpoint restart facilities wherein checkpoint data is updated only if all processors were able to collect new checkpoint data

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a distributed processing system with checkpoint restart facilities which allows each of a number of data processors comprising the system to execute the checkpoint restart facilities synchronously with another data processor in the system to prevent difficulties from arising in data transmission and reception among the data processors.
According to the present invention there is provided a distributed processing system with restart processing facilities comprising: communication control means, which are installed in each of a plurality of data processors constituting said system and which execute a predetermined program, for allowing transmission and reception of data between said data processors; checkpoint processing means for causing one of said data processors to request another data processor to collect checkpoint data via said communication control means and for determining, based on the response from the other data processor, the values of checkpoint data necessary for restart processing data storage means installed in each of said data processors for storing the checkpoint data determined by said checkpoint processing means; and restart processing means installed in each of said data processors for restarting said program on the basis of the checkpoint data stored in said data storage means.
Additional objects and advantages of the invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the invention.
The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the appended claims.