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1/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 New EPICS Channel Archiver based on MDSplus data system G. Manduchi, A. Luchetta, C. Taliercio, A. Soppelsa, A. Barbalace Consorzio RFX – Euratom-ENEA Association MDSplus is a data system widely used in the fusion community Provides tools and libraries for management of a rich variety of data Used in several fusion experiments for data acquisition Used in fusion as common format to exhcange experimental data
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2/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 MDSplus vs EPICS Channel Archiver The Channel archivers store plant data exported as EPICS Process Variables (PVs) in a database (indexed file for EPICS, pulse file for MDSplus) The MDSPlus channel archiver can sustain a much larger data throughput Tests carried out pointed out the limits in the EPICS archiver (lost samples and CPU load) in the new archiver data loss (0.05% of the total samples) starts at a rate of 300 kUpdate/s In the original EPICS archive data loss starts at a rate of 20 kUpdates/s MDSplus is a rugged data system since it has been used for almost 20 years in fusion devices for handling online and offline data acquisition
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3/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 Remote Data Access Remote data access was provided by the original EPICS Channel Archiver Based on XML RPC Limited support for programmatic data access (management of XML RPC protocol) When stored on MDSplus pulse files, data are natively available worldwide Use the mdsip protocol, optimized for communication speed Available in a variety of languages (Fortran, C, C++, Java, Python, IDL, Matlab) jScope provides interactive visualization of stored waveforms.
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