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Before executing the gnuplot executable the environment variable `GDFONTPATH`
is populated with a list of font directories, which is obtained from `fc-list`.
In that process we iterated over each line and called `dirname` on it, which
introduces a performance hit for loading and executing the external executable
`dirname` every time.
The new version avoids the loop.
The author of this patch measured a 42 fold performance improvement:
old version:
$ time ./gnuplot_old/bin/gnuplot -e ''
real 0m3.828s
user 0m0.392s
sys 0m0.465s
new version:
$ time ./gnuplot_new2/bin/gnuplot -e ''
real 0m0.091s
user 0m0.112s
sys 0m0.014s
The correctness of the value of `GDFONTPATH` was confirmed with the following
command and comparing its output between versions:
$ gnuplot -e 'print system("echo $GDFONTPATH")'
|
||
|---|---|---|
| .. | ||
| argyllcms | ||
| asymptote | ||
| barcode | ||
| briss | ||
| cfdg | ||
| cuneiform | ||
| dcraw | ||
| diagrams-builder | ||
| ditaa | ||
| dmtx-utils | ||
| editres | ||
| enblend-enfuse | ||
| eplot | ||
| exif | ||
| exiftags | ||
| fgallery | ||
| ggobi | ||
| gifsicle | ||
| glmark2 | ||
| glxinfo | ||
| gmic | ||
| gnuplot | ||
| graphviz | ||
| icoutils | ||
| imgur-screenshot | ||
| imgurbash | ||
| jbig2enc | ||
| jhead | ||
| kst | ||
| leela | ||
| logstalgia | ||
| lprof | ||
| maim | ||
| mscgen | ||
| netpbm | ||
| nifskope | ||
| nip2 | ||
| optipng | ||
| panomatic | ||
| pdf2svg | ||
| pdfread | ||
| pfstools | ||
| pgf | ||
| ploticus | ||
| plotutils | ||
| pngcheck | ||
| pngcrush | ||
| pngnq | ||
| pngout | ||
| pngquant | ||
| pngtoico | ||
| povray | ||
| pstoedit | ||
| qrcode | ||
| qrencode | ||
| quirc | ||
| scrot | ||
| sng | ||
| transfig | ||
| unpaper | ||
| vips | ||
| welkin | ||
| wkhtmltopdf | ||
| zbar | ||
| zxing | ||