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PERF: Use `-O2` gcc compilation flag for imagemagick (#768) 

Why this change?

We have noticed that our compiled imagemagick binary is slower than the
distributed binaries in the same environment and started debugging why.
One thing I noticed is that distributed binaries usually include the
`-O2` gcc compilation flag. When applying it locally, I saw significant
speed up.

Without -O2 flag:

```
root@1d7277f72a4f:/# time convert -limit memory 10GiB -limit disk 10GiB -size $(seq 8000 8500 | shuf | head -n1)x9000 xc:"rgb($(shuf -i 0-255 -n1),$(shuf -i 0-255 -n1),$(shuf -i 0-255 -n1))" random_image.png

real	0m3.376s
user	0m6.355s
sys	0m0.410s
root@1d7277f72a4f:/# time identify -format "%Q" random_image.png
92
real	0m1.018s
user	0m0.883s
sys	0m0.135s
```

With -O2 flag:

```
root@0779afa71102:/# time convert -limit memory 10GiB -limit disk 10GiB -size $(seq 8000 8500 | shuf | head -n1)x9000 xc:"rgb($(shuf -i 0-255 -n1),$(shuf -i 0-255 -n1),$(shuf -i 0-255 -n1))" random_image.png

real	0m1.118s
user	0m1.555s
sys	0m1.680s
root@0779afa71102:/# time identify -format "%Q" random_image.png
92
real	0m0.330s
user	0m0.197s
sys	0m0.133s
```
This commit is contained in:
Alan Guo Xiang Tan 2024-02-06 07:43:15 +08:00 committed by GitHub
parent 1964d1737a
commit a03cdcb257
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1 changed files with 1 additions and 1 deletions
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2
image/base/install-imagemagick
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@ -40,7 +40,7 @@ echo "$IMAGE_MAGICK_HASH $WDIR/ImageMagick.tar.gz" | sha256sum -c
IMDIR=$WDIR/$(tar tzf $WDIR/ImageMagick.tar.gz --wildcards "ImageMagick-*/configure" |cut -d/ -f1)
tar zxf $WDIR/ImageMagick.tar.gz -C $WDIR
cd $IMDIR
PKG_CONF_LIBDIR=$PREFIX/lib LDFLAGS=-L$PREFIX/lib CFLAGS=-I$PREFIX/include ./configure \
PKG_CONF_LIBDIR=$PREFIX/lib LDFLAGS=-L$PREFIX/lib CFLAGS='-O2 -I$PREFIX/include' ./configure \
--prefix=$PREFIX \
--enable-static \
--enable-bounds-checking \