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#!N
#!CNavyBlue #!N #!Rdistcmp Using Distributed Computation #!N #!EC #!N #!N Data
Explorer provides you with the capability to distribute your visual program
across a network of heterogeneous workstations. Distributing your visual program provides
you with parallelism and enhanced resource utilization. Parallelism is achieved by
the simultaneous execution of different portions of the visual program on
each of the workstations. The amount of parallelism that you can
achieve is dependent on the organization of your visual program and
the number of available workstations. #!N #!N Enhanced resource utilization can
be achieved, for example, by assigning computationally intensive portions of the
visual program to the more powerful workstations. If the data you
are visualizing is located on one or more workstations, then performing
some of the data realization and transformation on the workstations containing
the data can reduce data transfer overheads. #!N #!N Distributed processing
in Data Explorer is achieved in two ways: by using "outboard"
modules (user supplied) or by placing groups of tools to "execution
groups." These two methods can be used independently or in combination.
For a discussion of outboard modules see #!Lmodsior,dxall1049 h Inboard, Outboard, and Runtime-loadable Modules #!EL in IBM Visualization
Data Explorer Programmer's Reference. Execution groups can be created and modified
using the Visual Program Editor or by using attributes if you
are using the Data Explorer scripting language (see #!Lusl,dxall495 h Data Explorer Scripting Language #!EL ). Once
the execution groups are created, you assign each group to the
workstations over which you wish to distribute the visual program. You
can assign more than one group per workstation. Note that if
more than one group is assigned to a given workstation, the
groups will not be run as separate processes. #!N #!N Data
Explorer uses this two part approach of creating groups and assigning
groups to make it easier for you to change the set
of workstations over which you distribute your visual programs. This utility
is especially convenient if you share visual programs with other users.
#!N #!N When you execute a visual program for the first
time, the Data Explorer executive is started on each workstation over
which the program is to be distributed. Each executive "plans" the
execution and executes each of the execution groups assigned to it.
This means that not only is the computation and data flow
distributed, but the control flow is distributed as well. One of
the workstations is a "master"--the workstation to which the user interface
is connected. The master creates and initiates the communication between the
other workstations and distributes commands from the user interface to all
the workstations. The master also executes any execution group that is
not assigned to another workstation in addition to its own assigned
groups. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lall484,dxall485 h Creating, Modifying, and Deleting Execution Groups #!EL
#!N #!F-adobe-times-medium-i-normal--18* #!N
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