摘要:
A real-time system includes a plurality of processors for executing jobs of a plurality of periodic tasks each having predetermined period, assigns each job in a period of each of the tasks to the processors, calculates distribution of execution times during which jobs assigned are executed on the processors, determines, based on the distribution, whether each of the jobs finishes by a deadline within the period, determines that scheduling is impossible, when one of the jobs is determined not to finish by the deadline, determines whether the distribution of the execution times of the jobs each determined to finish by the deadline converge, and determines that scheduling is possible, when the distribution converge.
摘要:
Schedulability determination method of determining whether real-time scheduling of tasks is possible using processors, includes calculating Lk and Σi=1 . . . NMi*Uk,i, (1≦k,i≦N;k,i:integer) where Lk corresponds to task-k, Mi represents number of the one or more processors simultaneously used by task-i, Uk,i corresponds to task-k and task-i, and N represents number of tasks, and determining that real-time scheduling of tasks is possible using processors, if tasks all satisfy conditions, Σi=1 . . . NMi*Uk,i≦Lk for all k (1≦k≦N), wherein Lk corresponds to task-k which is to be detected to satisfy corresponding one of conditions, Lk being expressed as follows if Mk≦(M+1)/2, Lk=(M−Mk+1)−(M−2Mk+1)Ck/Dk, andUk,i is expressed as follows if Mk≦(M+1)/2, Mi
摘要:
Schedulability determination method of determining whether real-time scheduling of tasks is possible using processors, includes calculating Lk and Σi=1 . . . NMi*Uk, i, (1≦k, i≦N; k, i: integer) where Lk corresponds to task-k, Mi represents number of the one or more processors simultaneously used by task-i, Uk, i corresponds to task-k and task-i, and N represents number of tasks, and determining that real-time scheduling of tasks is possible using processors, if tasks all satisfy conditions, Σi=1 . . . NMi*Uk, i≦Lk for all k (1≦k≦N), wherein Lk corresponds to task-k which is to be detected to satisfy corresponding one of conditions, Lk being expressed as follows if Mk≦(M+1)/2, Lk=(M−Mk+1)−(M−2Mk+1)Ck/Dk, and Uk, i is expressed as follows if Mk≦(M+1)/2, Mi
摘要:
A scheme for constructing a database in a user system, which can automatically store those portions of the structured documents which contain important contents without exerting a burden on the user is disclosed. A structured document provided by a server device is obtained according to a document request made by the user system, where each structured document has a structure represented by tags in each structured document. Then, at least one important portion is automatically extracted from the structured document by utilizing the structure of the structured document according to prescribed extraction criteria specified in advance, and the extracted important portion is stored into the database, while the obtained structured document is transferred to the user system.
摘要:
A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for generating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.
摘要:
A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data-type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for gene rating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.
摘要:
A scheme for constructing a database in a user system, which can automatically store those portions of the structured documents which contain important contents without exerting a burden on the user is disclosed. A structured document provided by a server device is obtained according to a document request made by the user system, where each structured document has a structure represented by tags in each structured document. Then, at least one important portion is automatically extracted from the structured document by utilizing the structure of the structured document according to prescribed extraction criteria specified in advance, and the extracted important portion is stored into the database, while the obtained structured document is transferred to the user system.
摘要:
A transactional file system capable of realizing atomic update of plural files by transactions. In the transactional file system, a log entry containing information for validating all updates made by transaction collectively on a stable memory device, is generated for one or more files updated on a buffer region by the transaction since a start of a processing of the transaction until a commit of the transaction. Then, the log entry is written into the stable memory device at a time of the commit of the transaction.
摘要:
A transactional file system configured to realize atomic update of plural files by transactions. In the transactional file system, a log entry containing information for validating all updates made by a transaction collectively on a stable memory device, is generated for one or more files updated on a buffer region by the transaction since a start of a processing of the transaction until a commit of the transaction. Then, the log entry is written into the stable memory device at a time of the commit of the transaction.
摘要:
A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for generating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.