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sul-dlss / assembly-image

Creates JP2 image derivatives of files.
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Investigate setting an imageMagick memory or kakadu thread limit #21

Closed tallenaz closed 5 years ago

tallenaz commented 5 years ago

This may resolve some jp2-create issues we've seen since the upgrade to imageMagick v7 on common-accessioning. This can be enforced through imageMagick's policy.xml file. We may want to set a 1GB memory limit.

calavano commented 5 years ago

Adding the chances in-line to the gem would likely be the quickest fix.

To set a limit on the memory usage of ImageMagick: add to the beginning of the convert command: -limit memory 2GiB -limit map 2GiB These values can be tweaked as needed. This should force larger images to cache to disk.

The setting for ImageMagick can also be set globally through the /etc/ImageMagick-#/policy.xml

<policymap>
  <policy domain="resource" name="memory" value="2048MiB"/>
  <policy domain="resource" name="map" value="2048MiB"/>
</policymap>

To set a limit on the number of threads used by kakadu: add to the kdu_compress command: -num_threads 2