Dynamic Distributed Computing

Provides a simple demonstration of 'Direct Distributed Computing' (DDC) in Ada using the 'Distributed Systems Annex' (DSA).

Requirements

• Provide an application which performs a complex calculation.
• The calculation should be split into multiple jobs.
• Jobs should be distributed to worker partitions running on separate network nodes.
• Workers may join/leave the worker pool at any time during the calculation.

Versions

• Development (fused) ~ Builds a single executable which may be developed/debugged/tested as with any normal Ada program.

• Release (dsa) ~ Builds a distributed system providing a Boss partition and a Worker partition.

Folder Layout

• ./applet: Contains a folder each for the 'fused' (development) and 'dsa' (release) versions.

• ./library: Contains gnat project files for the common code in the 'source' folder.

• ./source: Contains source files common to both the fused and dsa versions.

Build

Polyorb is required.

Fused:

• $ cd ./applet/fused
• $ gnatmake -P ddc_fused

DSA:

• $ cd ./applet/dsa
• $ ./builder

Test

LAN

Open a new terminal

• $ cd ./applet/dsa/test/po_cos_naming
• $ po_cos_naming

Open a new terminal

• $ cd ./applet/dsa/test/boss
• $ ../../bin/boss_partition

Open a new terminal

• $ cd ./applet/dsa/test/worker1
• $ ../../bin/worker_partition

Open a new terminal

• $ cd ./applet/dsa/test/worker2
• $ ../../bin/worker_partition

WAN:

General:

Open /etc/hosts and ensure it contains a line with your WAN (WWW) net address, matched with your hostname (as defined in /etc/hostname).

Running a Boss:

Open a new terminal:

• $ cd ./applet/dsa/test/po_cos_naming

• Make sure that the 'polyorb.protocols.iiop.default_port' value is open in any firewall and forwarded to the box running the po_cos_naming server.

• $ po_cos_naming

Open a new terminal:

• $ cd ./applet/dsa/test/boss

• Edit polyorb.conf and set the name service to the value given by 'po_cos_naming' server output, similar to the following:

• name_service=corbaloc:iiop:1.2@192.168.1.4:5001/NameService/000000024fF0000000080000000

• Make sure that the 'polyorb.protocols.iiop.default_port' value is open in any firewall and forwarded to the box running the server.

• Finally, launch the boss ...

• $ ../../bin/boss_partition

Running a Worker:

Open a new terminal:

• $ cd ./applet/dsa/test/worker3

• Edit 'polyorb.conf' and set the name service to the value given by 'po_cos_naming' server output, similar to te following:

• name_service=corbaloc:iiop:1.2@192.168.1.4:5001/NameService/000000024fF0000000080000000

• Make sure that the 'polyorb.protocols.iiop.default_port' value is open in any firewall and forwarded to the box running the worker.

• Finally, launch the worker ...

• $ ../../bin/worker_partition