These intercommunicate using the BOINC remote procedure call (RPC) mechanism. It also generates results from workunits when they are first created, and when more are needed (for example, if a result turns out invalid).Ī screenshot of the BOINC manager applicationīOINC on the client is structured into a number of separate applications. The transitioner daemon handles state transitions of workunits and results. The file_deleter daemon deletes output files after the assimilator has processed them, and deletes input files that aren't needed anymore. An assimilator may also generate more workunits based on the returned data. For example, some projects may parse the file and store information in a database, others may just copy the file somewhere else.
Next, the assimilator daemon processes the canonical result using project-specific code. This is repeated until a quorum of matching results is found or a limit on the number of instances is If the results don't agree, or if one of the results is not reported by its deadline, the server generates an additional instance of the job, and sends it to a third host. If the validator determines that at least some of the results are valid, it marks the work unit and the valid results as valid, users who returned legitimate results are granted credit for it, and a "canonical result" is chosen. The validator can have custom project-code to do fuzzy comparison between results, or it can perform a bitwise comparison. One popular method would be to compare the results against each other. When all the results from a workunit are completed and returned, the validator checks them.
The feeder periodically fills empty "slots" in the shared-memory block after the scheduler has sent those results to a client. Instead, a feeder daemon loads tasks from the database and keeps them in a shared-memory block, which the scheduler reads. The scheduler doesn't get available results directly from the database. The scheduler CGI program handles requests from clients, receiving completed results and sending new work to compute. A project does not explicitly create results the server creates them automatically from workunits. A result describes an instance of a workunit, even if it hasn't been completed. Computations to be performed by clients are called workunits. The server consists of two CGI programs and (normally) five daemons, written in C++.
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BOINC is designed to be a free structure for anyone wishing to start a distributed computing project.The operations are performed client-side and the results are uploaded to the server-side. Once the BOINC software is installed in a machine, the server starts sending tasks to the client. The BOINC framework consists of two layers which operate under the client–server architecture. Visual diagram of BOINC client–server structureīOINC client–server technology refers to the model under which BOINC works.
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