Scalable Vector Graphics problems

Using Tivoli Performance Viewer without Scalable Vector Graphics (SVG)

In Version 8.x, the Tivoli® Performance Viewer graph uses Dojo Technology for plotting the performance activity rather than the Scalable Vector Graphics (SVG) format. The Dojo format provides a better user experience and is more processor and memory efficient for the application server. The SVG format is still supported but is deprecated in Version 8 of this product. To use the SVG format and image format, set the JVM property to false; for example: com.ibm.websphere.tpv.DojoGraph=false. If the property is set to false, Dojo is disabled and Tivoli Performance Viewer displays interactive graphics using the SVG format or non-interactive graphics using the JPG format. When you specify to use the SVG format by setting com.ibm.websphere.tpv.DojoGraph=false, if you do not have the Adobe SVG browser plug-in installed, you are prompted to download and install it. If you select not to install the plug-in (by selecting Cancel), Tivoli Performance Viewer displays the static image.

When you specify to use the SVG format by setting com.ibm.websphere.tpv.DojoGraph=false and you are viewing performance data in Tivoli Performance Viewer on a browser that does not support Scalable Vector Graphics (SVG) graphics, either using the Adobe SVG plug-in or through native support, complex graphs might take a long time to refresh. Eventually an out of memory error may occur.

When Tivoli Performance Viewer detects a browser that does not support SVG, it uses Apache Batik to transcode the SVG into a binary image format. The transcoding process is highly memory intensive. The complexity of the graph is affected by two things: the Tivoli Performance Viewer buffer size, which dictates how many points are in each line that is drawn, and the number of selected data points, which dictates how many lines are drawn.

To avoid long refresh times or the out of memory errors, use a browser that supports SVG, either with a plug-in, like the Adobe SVG plug-in, or natively, which is included in some Mozilla builds. If this is not possible, keep the graph simple by limiting the size of the buffer and the number of selected data points.