convertコマンドのメモリ上限

top20191121_convertPDF

連番の画像をPDF化する作業をしていたのですが、下記のエラーで途中までしかPDF化されない。

convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_28.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_29.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_30.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_31.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_32.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_33.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_34.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_35.png' @ error/cache.c/OpenPixelCache/3945.
convert-im6.q16: DistributedPixelCache '127.0.0.1' @ error/distribute-cache.c/ConnectPixelCacheServer/244.
convert-im6.q16: cache resources exhausted `/tmp/_output_36.png' @ error/cache.c/OpenPixelCache/3945.

調べてみるとメモリの上限に達した模様。

# cp /etc/ImageMagick-6/policy.xml /etc/ImageMagick-6/policy.xml~default
# vi /etc/ImageMagick-6/policy.xml

下記のように書き換え。

# diff  /etc/ImageMagick-6/policy.xml~default /etc/ImageMagick-6/policy.xml
53c53
<   <policy domain="resource" name="memory" value="256MiB"/>
---
>   <policy domain="resource" name="memory" value="2GiB"/>

top20191121_convertPDF