ADASS XI Sept30-Oct3, 2001 The ALMA Common Software (ACS) as a basis for a distributed software development G.Raffi, G.Chiozzi (ESO), B.Glendenning (NRAO)

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Presentation transcript:

ADASS XI Sept30-Oct3, 2001 The ALMA Common Software (ACS) as a basis for a distributed software development G.Raffi, G.Chiozzi (ESO), B.Glendenning (NRAO) Follows ADASS 2000: ALMA Computing Challenges by B.Glendenning

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software2 ALMA Project in Summary m antennas (25 microns, 0.6”) Array configurations:150m-10 Km Near S.Pedro de Atacama, Chile at 5000m Imaging capability over mm range 10 receiver bands compact array (several ~8m antennas) very high resolution correlator

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software3 ALMA Project Set-up Preliminary design - Phase 1, up to end 2001 Construction Phase - Phase 2, with interim operations starting at end of equal partners: Europe, Japan, North America with Europe and North America together since prototype antennas: ready Spring 02- Spring 03 to be tested at VLA site for final selection Cost 750 M$

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software4

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software5 ALMA design phase Top-down: Science Software Requirements (SSR) High-level analysis and design Bottom-up: Software for prototype antennas & test correlator Common infrastructure: ALMA Common Software (ACS) Software engineering practices

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software6 ALMA Computing Subsystems Control, Correlator (input: 96 Gb/s per antenna) On-line Pipeline, Off-line Data Reduction, Telescope Calibration Archiving ( Data rate >10MB/s TB/year) Observing Preparation, Scheduling –Automatic operation, including images –planned breakpoints to take decisions

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software7 ALMA Computer architecture

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software8 ALMA Common Software (ACS) –Common full framework, not only few libraries (for a very distributed group) (e.g. EPICS) –Well tested software that avoids duplication –Makes upgrades and maintenance reasonable –Achieves incremental development via Releases –Achieves standardisation offering environment with design patterns (rather than rules). –Common configuration control/installation procedures It worked on a comparable size project: the VLT

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software9 ACS software status Decided to start from existing product, to make use of CORBA experience Collaboration with JSI-Ljubliana to further develop existing system built for High Energy Physics Prototype Release 0 (tested on Kitt-Peak12 m antenna) First Realease 1.0 (Sept.01) In use in Test Interferometer Software (TICS) prototype Being integrated with Test Correlator software

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software10 ACS Distributed Object (DO) 3 tier model: DO- Property-Characteristics DO: base class for any physical/logical Device (e.g. temperature sensor, motor) Each DO has Read only or R/W Properties (e.g. status value, position - control/monitor points) Characteristics of Dos and Properties (Static data in Configuration DB, e.g. units, ranges, default values) JavaBeans (client side- automatically from DO IDL)

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software11 ACS Architecture

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software12 ACS platforms CORBA middleware: TAO (& ACE), Orbacus Makes use of CORBA services Operating system: Linux Languages: C++, JAVA, Python (TCL) Real-time: VME,VxWorks (Phase1), CAN bus Unified Modeling Language (UML) DB2 being evaluated as configuration DB Communication: Gigabit Ethernet to antennas

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software13 ALMA software development ACS incremental development via Releases every 6 months (Applications yearly) Science software to be developed in two main phases (ready for 2006 and 2010) Subsystems to be done by development teams at different sites Implies sharp increase in level of effort

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software14 Kitt Peak test (Dec.00): Pointing /tracking with 12 m Radio + optical tel.

ALMA Project ADASS XI Sep30-Oct3, 2001ALMA Common Software15 ALMA Sites: Chajnantor