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Performance Comparison of EPICS IOC and MARTe in a Hard Real-Time Control Application A.Barbalace 1, G. Manduchi 1, A. Neto 2, G. De Tommasi 3, D.F. Valcárcel.

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Presentation on theme: "Performance Comparison of EPICS IOC and MARTe in a Hard Real-Time Control Application A.Barbalace 1, G. Manduchi 1, A. Neto 2, G. De Tommasi 3, D.F. Valcárcel."— Presentation transcript:

1 Performance Comparison of EPICS IOC and MARTe in a Hard Real-Time Control Application A.Barbalace 1, G. Manduchi 1, A. Neto 2, G. De Tommasi 3, D.F. Valcárcel 2, F. Sartori 4 1 Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Corso Stati Uniti 4, I Padova, Italy 2 Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Av. Rovisco Pais, Lisboa, Portugal 3 Associazione EURATOM-ENEA-CREATE, Università di Napoli Federico II, I Napoli, Italy 4 Fusion for Energy, Barcelona, Spain ph , Fax poster PFE - 13

2 input/output board NI6255 (PXI external rack) workstation HP Compaq dc 7900 CMT, x86 Intel Core 2 Duo GHz, 3 MB L2, 3 GB RAM Linux version RT patched (rt-24), 1kHz system clock What we have done Similarities and Differences Case Study EPICS IOCMARTe modular components based architecturesRecordsGAMs current configuration is defined in a text fileReCompileReLoading computational resource modelNo ControlFull Control

3 Reference Prog. EPICS IOC MARTe min19.0 us30.0 us20.9 us MAX28.3 us60.5 us31.3 us Avg22.3 us39.3 us25.0 us min, MAX and average overall IO latency 1kHz2kHz5kHz10kHz Reference Prog. 2%4%8%14% EPICS IOC4% 14%28% MARTe4%7%14%29% CPU load at different clock frequencies First Results Comparing with a Reference Program the added latency due to MARTe in respect of the reference program is on average 2.7 µs. the added latency due to EPICS is 17 µs.

4 Conclusions Adding network queries EPICS IOCMARTe Lesson Learned MARTe provides a shorter and, above all, more bounded latency; EPICS can be used as well for non highly demanding real-time applications. Linux with the Real-Time patches appears to be well suited to develop hard Real-Time applications making it a strong candidate for real-time control in large systems.


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