Re: [Plplot-general] hard disk filling up

[<jc...@fe...>]

On Thursday 15 January 2004 09:27, Maurice LeBrun wrote:
|  Jay Christnach writes:
|   > hello again!
|   > to answer my previous question:
|   > My 50 channel oscilloscope application is feasible with plplot as graph
|   > library. It is really fast. I use the polygon fill function to erase
|   > previous plotted data.
|   >
|   > but another problem:
|   > If I let the program run a long time my hard disk fills up. It took
|   > some time to find out what file would get so huge, because the file
|   > doesn't show up in the filesystem, because it is already deleted.
|   > (funny phenomenon). #lsof -c scope
|   > COMMAND   PID USER   FD   TYPE     DEVICE       SIZE    NODE NAME
|   > (...)
|   > scope   32031 root    6u   REG        8,3 1415630848   19684
|   > /tmp/tmpfXiOQuk (deleted)
|
|  Heh.  That looks like the plot buffer.  As you create a plot under X, the
| plot buffer pseudo-device is written to, so that on window expose or redraw
| events, the prior contents of the window can be recovered.  It's closed at
| every end-of-page, and my guess is that you aren't issuing any.. LOL. 
| There really should be a size limitation on it though.. >1G is way, way too
| big. :)
|
|  Although there is no API control for this, fortunately you do have access
|  through the plplot stream pointer.  You can disable writing to the plot
| buffer entirely by setting pls->plbuf_write to 0.  Or keep it writing by
| default but control its contents through manipulating pls->plbufFile.  See
| src/plbuf.c for more info.

If using the xwin driver, you can use the "-drvopt nobuffered" cmd line driver 
option. Programatically, use plSetOpt("drvopt","nobuffered")

Joao