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Parallel Programming

Module by: Eduardo Perez. E-mail the author

Summary: The creation of this content was supported in some part by NSF grant 0538934.

In 1985, by design, G was developed to address and simplify parallel programming. If you have gone through the examples in this book, you have already developed various parallel programs.

In the following example, we will develop a simple program where interactivity and parallelism are part of the program.

Figure 1: Select Diagram for Parallel Programming
A diagram of Parallel Programming. The diagram consists of two rows of icons. The upper row from left to right consist of an orange box contina '0.02' over a blue box containg 'i'. lines connect these icons to a triangular icon with apex pointing right and it contains 'x'. A line connects this to a graph icon and then that is connected to another triangle icon and that triangle that points to a final graph icon labeled 'sine wave'. The bottom row of icons consist of an orange icon labeled 'amplitude' which connects via a line to the second triangle in the upper row. To the right of the 'Amplitude' icon is 'stop' button icon.

From the menu select Edit >> Copy.

Figure 2: Copy Selected Diagram
A typical edit menu in Windows with the item 'copy' highlighted.

Create a copy of the while loop and its contents by selecting Edit >> Paste. Organize the diagram as shown in the figure below.

Figure 3: Paste Diagram
A diagram of two Parallel Programming diagrams. The diagrams consist of two rows of icons and are idenitical except for a names of icons. The upper row from left to right they consist of an orange box contina '0.02' over a blue box containg 'i'. lines connect these icons to a triangular icon with apex pointing right and it contains 'x'. A line connects this to a graph icon and then that is connected to another triangle icon and that triangle that points to a final graph icon labeled 'sine wave'. In the second diagram the final icon is labeled 'sine wave 2'. The bottom row of icons consist of an orange icon labeled 'amplitude' or 'amplitude 2' for the second diagram which connects via a line to the second triangle in the upper row. To the right of the 'Amplitude' icon is 'stop' button icon.

Go the Front Panel window and organize the input and output controls as shown in the figure below.

Figure 4: Parallel G Program
Two parallel empty graphs.

You have just completed your first parallel interactive program using G. Save the program, run it and interact with it.

Figure 5: Parallel Interactive G Program
Two parallel graphs containing sine waves. The graph on the left contains a sine wave with a large amplitude than the one on the rightt.

To end this program click on the stop and stop 2 terminals.

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