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Update on the art framework

Update on the art framework. Marc Paterno Scientific Computing Division for the art team. Our context. art is the framework used by several experiments and efforts at Fermilab and elsewhere. NOvA , muon g-2, Mu2e, microBooNE , LBNE, DarkSide-50

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Update on the art framework

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  1. Update on the art framework Marc PaternoScientific Computing Divisionfor the art team

  2. Paterno / art framework Our context • art is the framework used by several experiments and efforts at Fermilab and elsewhere. • NOvA, muon g-2, Mu2e, microBooNE, LBNE, DarkSide-50 • Various other Liquid Argon activities, through LArSoft • It is an offshoot of the CMSSW framework, packaged as an “external product”, targeted for DAQ and offline use by many small collaborations. • Both art and the CMSSW framework are now developed by members of the same department at Fermilab.

  3. Paterno / art framework Multi-event parallelism support • We implemented high-level coordination appropriate for the event processing tasks in the experiments we support. • Hybrid parallelism scheme: 2-stage pipeline • serial trigger-path module operation for multiple events simultaneously • completed events queued for processing one at a time; each event processed by multiple analyzers and output modules in parallel.

  4. Paterno / art framework The 2-stage pipeline

  5. Paterno / art framework Multi-event parallelism support • We implemented high-level coordination appropriate for the event processing tasks in the experiments we support. • Hybrid parallelism scheme: 2-stage pipeline • serial trigger-path module operation for multiple events simultaneously • completed events queued for processing one at a time; each event processed by multiple analyzers and output modules in parallel • In addition, any module may invoke task-based parallelism at any time using TBB coordinated across the framework execution instance.

  6. Paterno / art framework Offloading algorithms to Xeon Phi • The Mu2e DAQ system needs high-performance tracking for their primary event filter. We are investigating the use of Xeon Phis for this task. • We have targeted the use of Intel TBB in “offload” mode. This requires building the code to be offloaded with the Intel C++ compiler. art uses much modern C++, and the Intel compiler doesn’t understand all of it. • We have enhanced the art build system to support hybridcompilation with ICC and GCC • TBB library and high-level “user” module package compiled with Intel 14.0.2 over GCC 4.8.2 • art infrastructure compiled with GCC 4.8.2 • allows us to build our code, using as-shipped art framework libraries and executables. • We are able to run art modules that offload algorithms to the accelerator, using TBB.“Fallback” operation using TBB on the multi-core in the absence of an accelerator has also been achieved, without alteration of source code or recompilation. • Four Intel C++compiler bugs have been reported back to Intel (with full reproduction instructions). One is already in the queue for release with Intel C++ 14.0.3 and the others are all “with engineering”.

  7. Paterno / art framework Multi-threading support for art services • Parallel event processing requires controlled access to global resources (services). • Services may be • truly global (provider gives thread safety guarantee) • private to a single schedule (state synchronized for the one event the schedule is processing) • In our 2-stage pipeline system, context management allows the correct service to be provided when a ServiceHandleis used. • Service callback system upgraded to C++11; signals are also classified as either global or per-schedule.

  8. Paterno / art framework Delivery status • All changes (infrastructure, internal reorganization and new features) have been applied to the as-shipped code to lessen conversion shock and risk of conflict with development not related to parallelism.

  9. Paterno / art framework art use in a data acquisition system Network Interface Cards DAQ Server EventBuilder Process • art is an integral part of multi-process MPI artdaqapplication • streaming I/O modules move data without writing to disk EventStore art Data Logger Aggregator Process x N (EventBuilders) Event Sorting art x 36 (DAQ Servers) ... DAQ Server EventBuilder Process ... EventStore art Event Building Network x N (EventBuilders)

  10. Paterno / art framework Ongoing directions • Concentrate on allowing algorithm development to use all available resources, accelerator or multi-core. • Allow easy integration of the algorithms into art framework applications through our build system. • Allow art to be readily incorporated into higher-level systems, using HPC technologies to take advantage of modern hardware.

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