Traffic Report

shows internal PE-to-PE traffic

The Traffic Report shows internal PE-to-PE traffic over time. The information on this report is broken out by communication type (read, write, barrier, and so on). While this report is displayed, the user can:

• Hover over an item to display quantitative information.
• Zoom in and out, either by using the zoom buttons or by drawing a box around the area of interest.
• Right-click an area of interest to open a pop-up menu, which enables the user to hide the origin or destination of the call.
• Right-click the report tab to access alternate zoom in and out controls, or to filter the communications shown on the report by the duration of the messages.
• Filtering messages by duration is useful to capture a particular group of messages. For example, to see only the messages that take the most time, move the filter caliper points to define the desired range, then click the Apply button.

  The Traffic Report is often quite dense and typically requires zooming in to reveal meaningful data. Look for large blocks of barriers that are being held up by a single PE. This may indicate that the single PE is waiting for a transfer, or it can also indicate that the rest of the PEs are waiting for that PE to finish a computational piece before continuing.