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I'm looking to develop a web-application that translates request parameters into a PNG/GIF chart. I'm looking to reuse an open source charting library, but I have concerns about the scalability.

A long time ago, we were using a single Xvfb buffer to render our image into, but that basically meant servicing only one incoming request at a time.

According to the man page it seems we can create numerous buffers? If so, is it simply ensuring there is enough physical RAM to prevent excessive paging?

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1 Answer 1

You can use xvfb-run your-command. It takes care of set up and clean up.

From the man page:

xvfb-run is a wrapper for the Xvfb(1x) command which simplifies the task of running commands (typically an X client, or a script containing a list of clients to be run) within a virtual X server environment. xvfb-run sets up an X authority file, writes a cookie to it (see xauth(1x)) and then starts the Xvfb X server as a background process. The process ID of Xvfb is stored for later use. The specified command is then run using the X display corresponding to the Xvfb server just started and the X authority file created earlier.

When the command exits, its status is saved, the Xvfb server is killed (using the process ID stored earlier), the X authority cookie removed, and the authority file deleted. xvfb-run then exits with the exit status of command.

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