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# Glasgow Parallel Haskell (GpH) and Eden documentation
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This page will describe the GpH and Eden parallel variants of GHC. This is work in progress.
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St Andrews has hosted the [HackPar](hack-par) parallel hackathon in December 2009.
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Heriot-Watt will host a [HackSprint](hack-sprint) meeting 12-14th December 2010.
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Heriot-Watt will host the [http://saints.sqpn.com/blessed-clement-of-dunblane/ Blessed Clement of Dunblane](http://saints.sqpn.com/blessed-clement-of-dunblane/ Blessed Clement of Dunblane) [HackDay](gp-h-eden/hack-day-mar13) on Tue March 19th, 2013.
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A series of [Parallel Hacker Meetings](gph-eden/meetings) has been launched.
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---
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What follows is an entry page to describe technical documentation of the Eden/GpH implementation in parallel systems with distributed memory.
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The different aspects are covered by separate pages reachable from here.
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## Modifications to implement Eden (and parallel RTS instances in general)
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- [Compiler Ways](gph-eden/compiler-ways) for parallelism
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- [Startup and Shutdown](gph-eden/start-stop) of the parallel system
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- [Packing and Unpacking Heap Structures](gph-eden/packing)
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- [Primitive Operations for Coordination Control](gph-eden/primitives)
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- [Placeholders, Garbage Collection, other Aspects](gph-eden/placeholders-and-gc)
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Future work
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- event logging for parallel Haskell
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- GUM variant of packing code, using global addressing
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## People
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Here is a list of hackers involved in the development of GpH/Eden
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- [Jost Berthold (JB)](http://www.mathematik.uni-marburg.de/~berthold/)
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- [Vladimir Janjic (VJ)](http://www.cs.st-andrews.ac.uk/~jv),
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- [Hans-Wolfgang Loidl (HWL)](http://www.macs.hw.ac.uk/~hwloidl/)
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- [Kevin Hammond (KH)](http://www.cs.st-andrews.ac.uk/~kh/)
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- [Mustafa Aswad (MKA)](http://www.macs.hw.ac.uk/~mka19/)
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- [Henrique Ferreiro (HE)](http://www.madsgroup.org/staff/henrique/)
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- [Philip W Trinder (PWT)](http://www.macs.hw.ac.uk/~trinder/)
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- [Patrick Maier (PM)](http://www.macs.hw.ac.uk/~pm175)
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- [Abyd Al Zain (AAZ)](http://www.macs.hw.ac.uk/~ceeatia/)
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- [Mischa Dieterle (MD)](http://www.mathematik.uni-marburg.de/~dieterle)
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- Thomas Horstmeyer (TH)
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## Communication
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A mailing list for parallel Haskell implementors has been set up at HWU:
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[hackpar](http://www.macs.hw.ac.uk/mailman/listinfo.cgi/hackpar)
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## Tasks
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This list of tasks is based on the discussion during the parallel hackathon, Dec 2009.
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Each task has a maintainer associated with it, who looks after the software.
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- GpH/Eden Code maintenance: (HWL to oversee)
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- Scheduling: Per-PE scheduling and load distribution policies (VJ)
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- Packing/Serialisation: Turning a graph into a write-/send-able format (JB)
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- Distributed Shared Memory: Abstraction layer over distribution of heap (HWL)
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- Communication: Sending and receiving work and data (MKA)
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- Monitoring/Tracing: MD/TH
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- Visualisation Tools: Visualising parallel execution (MD/TH)
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- Parallel NoFib Suite: Parallel benchmark programs (HE)
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- Testsuite: Programs testing the parallel RTS
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- Packaging and building: ???
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- Darcs repo maintenance: Main repos in Marburg (JB)
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- GpH/Eden tracs ticketing: Bug reports (HWL)
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