<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:13px">2- Is the graphics production time (For big maps with a resolution of 16384 x 16384 pixels) is improved with ParNCL </span><div><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div><span style="font-family:arial,sans-serif;font-size:13px">Regarding the graphics, the NCL team has made considerable progress speeding up the raster graphic output using OpenMP. This is not yet integrated into the ParNCL code, but should be sometime this fall. The highest resolution plots we have attempted so far have been in the order of 8000x8000 pixels, partly because we do not have data with high enough resolution to warrant more pixels. The</span></div>
<div><span style="font-family:arial,sans-serif;font-size:13px">8000x8000 plots were used to render an MPAS grid with 65 million cells. </span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div>
<div><span style="font-family:arial,sans-serif;font-size:13px">Given this data, the timings do seem to be significantly dependent on the output resolution. I just tried creating output at</span></div><div><span style="font-family:arial,sans-serif;font-size:13px">16384 pixel resolution and find the time more than doubles compared to 8096 pixel output. Here are some sample timings for this</span></div>
<div><span style="font-family:arial,sans-serif;font-size:13px">dataset using 16 threads at various resolutions:</span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><div style><font face="arial, sans-serif">16384 pixels</font></div>
<div style><font face="arial, sans-serif">real 18m0.539s</font></div><div style><font face="arial, sans-serif">user 29m47.124s</font></div><div style><font face="arial, sans-serif">sys 7m15.971s</font></div><div style>
<font face="arial, sans-serif"><br></font></div><div style><font face="arial, sans-serif">8096 pixels</font></div><div style><font face="arial, sans-serif">real 7m27.724s</font></div><div style><font face="arial, sans-serif">user 27m25.347s</font></div>
<div style><font face="arial, sans-serif">sys 0m11.493s</font></div><div style><font face="arial, sans-serif"><br></font></div><div style><font face="arial, sans-serif">4096 pixels</font></div><div style><font face="arial, sans-serif">real 3m19.724s</font></div>
<div style><font face="arial, sans-serif">user 20m34.954s</font></div><div style><font face="arial, sans-serif">sys 0m11.546s</font></div><div style><font face="arial, sans-serif"><br></font></div><div style><font face="arial, sans-serif">2048 pixels</font></div>
<div style><font face="arial, sans-serif">real 3m9.095s</font></div><div style><font face="arial, sans-serif">user 24m0.784s</font></div><div style><font face="arial, sans-serif">sys 0m11.290s</font></div></div>
<div style><font face="arial, sans-serif"><br></font></div><div style><font face="arial, sans-serif">If more than a single plots uses the same data grid and map projection, time for subsequent plots can be much less than the first plot. </font></div>
<div style><font face="arial, sans-serif"><br></font></div><div style><font face="arial, sans-serif">We are actively working on further improvements and we think that additional efficiencies are definitely possible. If you have particular high-res data that you would like us to be able to plot in a reasonable amount of time, we would like to work with it. If that is the case, please contact me.</font></div>
<div style><br></div><div style><font face="arial, sans-serif">- Dave Brown</font></div><div style><font face="arial, sans-serif">NCL development team</font></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><br></div></div>