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Distributed application load distribution aid tool
| Details |
Inventors: Sitbon, Gerard; Urbain, Francois; Saliba, Therese;
Assignee: Bull S.A. (Louveciennes, FR)
Primary Examiner: Grant; William
Assistant Examiner: Robinson; Victoria
Attorney, Agent or Firm: Kerkam, Stowell, Kondracki & Clarke, P.C., Kondracki; Edward J.
A tool at the service of a distributed application running on machines of a distributed data processing system running in a local area network, intended for balancing the load on each of the machines of the system, includes a master daemon and a plurality of agent demons. The master and each of the agents calculate the load of the machine on which they are running. The master collects the load data of each of the agents at a first sampling interval and sends that collected load data to all of the agents. At the request of the distributed application, the local agent closest to the application indicates to the application which machine has the lightest load. The application then makes the decision to request the machine with the lightest load to execute the services the application requires. As necessary, the tool selects a master from the agents, thereby ensuring the existence and uniqueness of a master at all times, regardless of failure affecting one 1010 or more machines in the data processing system. |
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DETAILED DESCRIPTION We claim: 1.
A tool (ORC) at the service of a distributed application (APU) running on machines (MC0 through MC3) of a distributed data processing system (SID) in a local area network (RE), intended for balancing a load on each of said machines, said tool comprising a plurality of data processing modules (MS0, A1 through A3) called DAEMONs which run on said machines, one of which is a master (MS0), the others being agents (A1 through A3), the master (MS0) and the agents (A1 thorough A3) having respective means (MCC0 through MCC3) for calculating at first determined sampling instants ti the load of the machines on which the DAEMONs are running and respective storage means (MP0 through MP3) for storing the load data of the master and the agents, the master (MS0) containing: means (MRC0 through MRC3) for collecting load data of the respective agents at second determined sampling instants Ti, means (MTC0) for sending the load data of each agent to all of the agents, each agent (A1 through A3) containing: respective means (MRCC1 through MRCC3) for receiving the load data of the other agents, whereby at a request of the application the local agent closest to the application indicates to the application which machine has the lightest load, the application then making the decision to request said machine with the lightest load to execute services the application requires.
2.
The tool according to claim 1, further comprising selection means (AUT) for choosing a master from the DAEMONs, which ensures the existence and the uniqueness of said master at the start-up of said DAEMONs and after loss of a master during the execution of the tool (ORC).
3.
The tool according to claim 1, further comprising means (AUT, e8) for ensuring continuity of the service rendered to the application by the tool in case of a failure affecting at least one machine in the data processing system.
4.
The tool according to claim 1, further comprising means (AUT, el, State I0) for automatically detecting from the network which machines will allow the network to retrieve the addresses of all the machines at the start-up of the DAEMONs
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