The ALMA Common Software (ACS) as a basis for a distributed software development
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ADASS XI Sept30-Oct3, 2001 The ALMA Common The ALMA Common Software (ACS) Software (ACS) as a basis for a as a basis for a distributed software distributed software development development G.Raffi, G.Chiozzi (ESO), B.Glendenning (NRAO) Follows ADASS 2000: ALMA Computing Challenges by B.Glendenning
description
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 in Summary. 64 12-m antennas (25 microns, 0.6”) Array configurations:150m-10 Km - PowerPoint PPT Presentation
Transcript of The ALMA Common Software (ACS) as a basis for a distributed software development
ADASS XI Sept30-Oct3, 2001
The ALMA Common Software The ALMA Common Software (ACS) (ACS)
as a basis for a distributed software as a basis for a distributed software developmentdevelopment
G.Raffi, G.Chiozzi (ESO), B.Glendenning (NRAO) Follows ADASS 2000:
ALMA Computing Challenges by B.Glendenning
ADASS XI Sep30-Oct3, 2001
ALMA Common Software 2
ALMA Project
ALMA Project in Summary
• 64 12-m antennas (25 microns, 0.6”)
• Array configurations:150m-10 Km
• Near S.Pedro de Atacama, Chile at 5000m
• Imaging capability over 10-0.35mm range
• 10 receiver bands
• compact array (several ~8m antennas)
• very high resolution correlator
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ALMA Project
ALMA Project Set-up
• Preliminary design - Phase 1, up to end 2001• Construction Phase - Phase 2, 2002-2010
with interim operations starting at end of 2005
• 3 equal partners: Europe, Japan, North Americawith Europe and North America together since 1999
• 3 prototype antennas: ready Spring 02- Spring 03to be tested at VLA site for final selection
• Cost 750 M$
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ALMA Project
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ALMA Common Software 5
ALMA Project
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
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ALMA Project
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 - 300 TB/year)
• Observing Preparation, Scheduling– Automatic operation, including images– planned breakpoints to take decisions
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ALMA Project
ALMA Computer
architecture
CA
N
High-Speed Switched Network
CA
N
Eth
erne
t
Array Real-Time Machine(ARTM)
OperatorsAnalysisEngineering station
Short-Term Data Archive
ATM Switch
Antenna Bus Master
ACU
Correlator Control Computer(CCC)
Receivers
DataReceivers
LO System
IF System
OpticalTelescope Cryogenics
Fiber/ATM
etc.
...
Correlator
Array Control Computer(ACC)
Calibration Pipeline
CRG
etc
GPS
TP Detectors
Holography
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ALMA Project
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
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ALMA Project
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
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ALMA Project
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)
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ALMA Project
ACS Architecture
CORBA Middleware
Command System
Error System Logging System
ACS Application Framework
FITS libraries
Astro libraries
UIF libraries
Applications
Distributed Object
Scripting
Alarm System Sampling
Time SystemData channel
Archiving System
ACE
Management and Access Control
Development tools
2 - Core components
1 - Base tools
3 - Services
4 - Hi-level APIs and tools
...more to come...
Device Drivers
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ALMA Project
ACS platforms
• CORBA middleware: TAO (& ACE), OrbacusMakes 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
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ALMA Project
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
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ALMA Project
Kitt Peak test
(Dec.00):
Pointing /tracking with 12 m Radio +
optical tel.
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ALMA Project
ALMA Sites: Chajnantor www.eso.org/projects/alma
www.alma.nrao.edu/development/computing
