I use convert to merge 68 pages of jpg images (about 156MB) into a pdf.
I did this dozens of times as recently as April 2025.
I tried to do it today and only get about 23 images in the pdf and get a cache error.
I edited /etc/ImageMagic-7/policy.xml as suggested on the internet - It used to work with no changes.
I doubled every constant 8 to 16, 256 to 512, etc - no change I even up the memory to 3 GiB but no change.
How do I get it to work like ImageMagick-6 did?
I could reproduce something:
$ convert DSC0665?.JPG DSC0664?.JPG /tmp/ramdisk/document.pdf
WARNING: The convert command is deprecated in IMv7, use "magick" instead of "convert" or "magick convert"
convert: cache resources exhausted `DSC06654.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06655.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06656.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06657.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06658.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06659.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06640.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06641.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06642.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06643.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06644.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06645.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06646.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06647.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06648.JPG' @ error/cache.c/OpenPixelCache/3917.
convert: cache resources exhausted `DSC06649.JPG' @ error/cache.c/OpenPixelCache/3917.
$ magick DSC0665?.JPG DSC0664?.JPG /tmp/ramdisk/document.pdf
magick: cache resources exhausted `DSC06654.JPG' @ error/cache.c/OpenPixelCache/3917.
$ lsa /tmp/ramdisk/
total 20692
20644 -rw-r--r-- 1 marel marel 21138607 Aug 14 07:18 document.pdf
$ okular /tmp/ramdisk/document.pdf
That document shows only 3 pages.
Interesting to see magick gives different output the convert, magick convert gives the same output as convert.
I even tried that stack overflow - every attempt gives the same 20 pages and cache error
my file
sed -i '/disable ghostscript format types/,+6d' /etc/ImageMagick-7/policy.xml #this one is just to solve convertion from .tiff to pdf, you may need it some day
sed -i -E 's/name="memory" value=".+"/name="memory" value="8GiB"/g' /etc/ImageMagick-7/policy.xml
sed -i -E 's/name="map" value=".+"/name="map" value="8GiB"/g' /etc/ImageMagick-7/policy.xml
sed -i -E 's/name="area" value=".+"/name="area" value="8GiB"/g' /etc/ImageMagick-7/policy.xml
sed -i -E 's/name="disk" value=".+"/name="disk" value="8GiB"/g' /etc/ImageMagick-7/policy.xml
???
You have to change in the file f. e.
disk from 1GB to 8GB
This is the line in my policy.xml:
grep -i ‘“disk” value=’ /etc/ImageMagick-7/policy.xml
<policy domain="resource" name="disk" value="8GiB"/>
What you have posted are 5 separate commands executed as root.
That is what the cache resource ImageMagick stackoverflow.com post said was a fix. I did that as well. I saved the original copy of policy.xml as policy.ori so I could undo every change if I needed to.
No matter what values I put in, the selection with 68 images it cache errors after 20 pages. The weird part is if I tried one with 168 images, it makes it to 108 pages before the cache error. Every image is about a 2MB image.
Why did the ImageMagick-5 have no issues with the default values and ImageMagick-7 fail no matter what is in the policy.xml.
Post:
ls -al /etc/ImageMagick-7/
Also try for disk 12GB instead of 8GB…
> ls -al /etc/ImageMagick-7/
total 396
drwxr-xr-x 2 root root 4096 Aug 14 07:00 .
drwxr-xr-x 174 root root 16384 Aug 13 11:29 ..
-rw-r--r-- 1 root root 1383 Jul 16 04:49 colors.xml
-rw-r--r-- 1 root root 13337 Jul 16 04:49 delegates.xml
-rw-r--r-- 1 root root 52531 Jul 16 04:49 english.xml
-rw-r--r-- 1 root root 55403 Jul 16 04:49 francais.xml
-rw-r--r-- 1 root root 2461 Jul 16 04:49 locale.xml
-rw-r--r-- 1 root root 1642 Jul 16 04:49 log.xml
-rw-r--r-- 1 root root 134852 Jul 16 04:49 mime.xml
-rw-r--r-- 1 root root 6835 Jul 16 04:49 policy.ori
-rw-r--r-- 1 root root 6835 Aug 14 07:00 policy.xml
-rw-r--r-- 1 root root 2369 Jul 16 04:49 quantization-table.xml
-rw-r--r-- 1 root root 11452 Jul 16 04:49 thresholds.xml
-rw-r--r-- 1 root root 29218 Jul 16 04:49 type-apple.xml
-rw-r--r-- 1 root root 8490 Jul 16 04:49 type-dejavu.xml
-rw-r--r-- 1 root root 9544 Jul 16 04:49 type-ghostscript.xml
-rw-r--r-- 1 root root 8162 Jul 16 04:49 type-urw-base35.xml
-rw-r--r-- 1 root root 13706 Jul 16 04:49 type-windows.xml
-rw-r--r-- 1 root root 612 Jul 16 04:49 type.xml
Test with ImageMagick 7.1.2.0 from Experimental Graphics repo:
Also post:
diff -Naur /etc/ImageMagick-7/policy.xml /etc/ImageMagick-7/policy.ori
# diff -Naur /etc/ImageMagick-7/policy.xml /etc/ImageMagick-7/policy.ori
--- /etc/ImageMagick-7/policy.xml 2025-08-14 07:00:49.127284223 -0500
+++ /etc/ImageMagick-7/policy.ori 2025-07-16 04:49:34.000000000 -0500
@@ -48,18 +48,18 @@
<!-- Set maximum amount of memory in bytes to allocate for the pixel cache
from the heap. When this limit is exceeded, the image pixels are cached
to memory-mapped disk. -->
- <policy domain="resource" name="memory" value="8GiB"/>
+ <policy domain="resource" name="memory" value="256MiB"/>
<!-- Set maximum amount of memory map in bytes to allocate for the pixel
cache. When this limit is exceeded, the image pixels are cached to
disk. -->
- <policy domain="resource" name="map" value="8GiB"/>
+ <policy domain="resource" name="map" value="512MiB"/>
<!-- Set the maximum width * height of an image that can reside in the pixel
cache memory. Images that exceed the area limit are cached to disk. -->
- <policy domain="resource" name="area" value="8GiB"/>
+ <policy domain="resource" name="area" value="16KP"/>
<!-- Set maximum amount of disk space in bytes permitted for use by the pixel
cache. When this limit is exceeded, the pixel cache is not be created
and an exception is thrown. -->
- <policy domain="resource" name="disk" value="8GiB"/>
+ <policy domain="resource" name="disk" value="1GiB"/>
<!-- Set the maximum length of an image sequence. When this limit is
exceeded, an exception is thrown. -->
<policy domain="resource" name="list-length" value="128"/>
#
What about this change only:
<policy domain="resource" name="disk" value="12GiB"/>
Yesterday the same error on converting 100 jpg’s to a pdf, but after this change I was able to do so.
ILL policy was changed to use disk, and then available disk limit was also shrinked?!
IMHO this worths bug report.
I got it to work also with these values - threads seem to be ignored as I set it to 8 and got 1
> convert -list resourceResource limits:
Width: 12000P
Height: 12000P
Area: 15.0324GP
List length: 512B
Memory: 14GiB
Map: 14GiB
Disk: 14GiB
File: 768
Thread: 1
Throttle: 0
Time: 4 minutes
>
# diff -Naur /etc/ImageMagick-7/policy.xml /etc/ImageMagick-7/policy.ori
--- /etc/ImageMagick-7/policy.xml 2025-08-14 12:22:57.162429225 -0500
+++ /etc/ImageMagick-7/policy.ori 2025-07-16 04:49:34.000000000 -0500
@@ -37,10 +37,10 @@
-->
<policymap>
<!-- Set maximum parallel threads. -->
- <policy domain="resource" name="thread" value="8"/>
+ <policy domain="resource" name="thread" value="2"/>
<!-- Set maximum time in seconds. When this limit is exceeded, an exception
is thrown and processing stops. -->
- <policy domain="resource" name="time" value="240"/>
+ <policy domain="resource" name="time" value="120"/>
<!-- Set maximum number of open pixel cache files. When this limit is
exceeded, any subsequent pixels cached to disk are closed and reopened
on demand. -->
@@ -48,27 +48,27 @@
<!-- Set maximum amount of memory in bytes to allocate for the pixel cache
from the heap. When this limit is exceeded, the image pixels are cached
to memory-mapped disk. -->
- <policy domain="resource" name="memory" value="14GiB"/>
+ <policy domain="resource" name="memory" value="256MiB"/>
<!-- Set maximum amount of memory map in bytes to allocate for the pixel
cache. When this limit is exceeded, the image pixels are cached to
disk. -->
- <policy domain="resource" name="map" value="14GiB"/>
+ <policy domain="resource" name="map" value="512MiB"/>
<!-- Set the maximum width * height of an image that can reside in the pixel
cache memory. Images that exceed the area limit are cached to disk. -->
- <policy domain="resource" name="area" value="14GiB"/>
+ <policy domain="resource" name="area" value="16KP"/>
<!-- Set maximum amount of disk space in bytes permitted for use by the pixel
cache. When this limit is exceeded, the pixel cache is not be created
and an exception is thrown. -->
- <policy domain="resource" name="disk" value="14GiB"/>
+ <policy domain="resource" name="disk" value="1GiB"/>
<!-- Set the maximum length of an image sequence. When this limit is
exceeded, an exception is thrown. -->
- <policy domain="resource" name="list-length" value="512"/>
+ <policy domain="resource" name="list-length" value="128"/>
<!-- Set the maximum width of an image. When this limit is exceeded, an
exception is thrown. -->
- <policy domain="resource" name="width" value="12KP"/>
+ <policy domain="resource" name="width" value="8KP"/>
<!-- Set the maximum height of an image. When this limit is exceeded, an
exception is thrown. -->
- <policy domain="resource" name="height" value="12KP"/>
+ <policy domain="resource" name="height" value="8KP"/>
<!-- Periodically yield the CPU for at least the time specified in
milliseconds. -->
<!-- <policy domain="resource" name="throttle" value="2"/> -->
#
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