Add notes for 2022-10-28

content/posts/2022-10.md

@@ -672,4 +672,89 @@ $ pngquant /tmp/10568-125167.pdf.png
 - Spent some time looking at the MediaBox / CropBox thing in DSpace's `ImageMagickThumbnailFilter.java`
   - We need to make sure to put `-define pdf:use-cropbox=true` before we specify the input file or else it will not have any effect
 
+## 2022-10-27
+
+- I found out that we can use [pdfcpu to remove the CropBox from a PDF](https://pdfcpu.io/boxes/boxes_remove.html#examples) for testing:
+
+```console
+$ pdfcpu box rem -- "crop" in.pdf out.pdf
+```
+
+- I filed [an issue on DSpace](https://github.com/DSpace/DSpace/issues/8549) for the ImageMagick `CropBox` problem
+  - I decided that this is a bug that should be fixed separately from the "improving thumbnail quality" issue
+  - I made [a pull request](https://github.com/DSpace/DSpace/pull/8550) to fix the `CropBox` issue
+- I did more work on my [improved-dspace-thumbnails](https://github.com/alanorth/improved-dspace-thumbnails/) microsite to complement the DSpace thumbnail pull requests
+  - I am updating it to recommend using the PDF cropbox and "supersampling" with a higher density than 72
+  - I measured execution time of ImageMagick with `time` and found that the higher-density mode takes about five times longer on average
+  - I measured the [maximum heap memory of ImageMagick with Valgrind and Massif](https://stackoverflow.com/a/131346):
+
+```console
+$ valgrind --tool=massif magick convert ...
+```
+
+- Then I checked the results for each set of default DSpace thumbnail runs and "improved" thumbnail runs using `ms_print` (hacky way to get the max heap, I know):
+
+```console
+$ for file in memory-dspace/massif.out.49*; do ms_print "$file" | grep -A1 "    MB" | tail -n1 | sed 's/\^.*//'; done
+15.87
+16.06
+21.26
+15.88
+20.01
+15.85
+20.06
+16.04
+15.87
+15.87
+20.02
+15.87
+15.86
+19.92
+10.89
+$ for file in memory-improved/massif.out.5*; do ms_print "$file" | grep -A1 "    MB" | tail -n1 | sed 's/\^.*//'; done
+245.3
+245.5
+298.6
+245.3
+306.8
+245.2
+306.9
+245.5
+245.2
+245.3
+306.8
+245.3
+244.9
+306.3
+165.6
+```
+
+- Ouch, this shows that it takes about *fifteen times* more memory to do the "4x" density of 288!
+  - It seems more reasonable to use a "2x" density of 144:
+
+```console
+$ for file in memory-improved-144/*; do ms_print "$file" | grep -A1 "    MB" | tail -n1 | sed 's/\^.*//'; done
+61.80
+62.00
+76.76
+61.82
+77.43
+61.77
+77.48
+61.98
+61.76
+61.81
+77.44
+61.81
+61.69
+77.16
+41.84
+```
+
+- There's a really cool visualizer called massif-visualizer, but it isn't easy to parse
+
+## 2022-10-28
+
+- I finalized the code for the ImageMagick density change and made a [pull request](https://github.com/DSpace/DSpace/pull/8553) against DSpace 7.x
+
 <!-- vim: set sw=2 ts=2: -->

docs/2022-10/index.html

@@ -20,7 +20,7 @@ I filed an issue to ask about Java 11+ support
 <meta property="og:type" content="article" />
 <meta property="og:url" content="https://alanorth.github.io/cgspace-notes/2022-10/" />
 <meta property="article:published_time" content="2022-10-01T19:45:36+03:00" />
-<meta property="article:modified_time" content="2022-10-26T09:15:29+03:00" />
+<meta property="article:modified_time" content="2022-10-26T17:50:40+03:00" />
 
 
 
@@ -46,9 +46,9 @@ I filed an issue to ask about Java 11&#43; support
   "@type": "BlogPosting",
   "headline": "October, 2022",
   "url": "https://alanorth.github.io/cgspace-notes/2022-10/",
-  "wordCount": "3320",
+  "wordCount": "3650",
   "datePublished": "2022-10-01T19:45:36+03:00",
-  "dateModified": "2022-10-26T09:15:29+03:00",
+  "dateModified": "2022-10-26T17:50:40+03:00",
   "author": {
     "@type": "Person",
     "name": "Alan Orth"
@@ -849,6 +849,92 @@ I filed an issue to ask about Java 11&#43; support
 </ul>
 </li>
 </ul>
+<h2 id="2022-10-27">2022-10-27</h2>
+<ul>
+<li>I found out that we can use <a href="https://pdfcpu.io/boxes/boxes_remove.html#examples">pdfcpu to remove the CropBox from a PDF</a> for testing:</li>
+</ul>
+<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>$ pdfcpu box rem -- <span style="color:#e6db74">&#34;crop&#34;</span> in.pdf out.pdf
+</span></span></code></pre></div><ul>
+<li>I filed <a href="https://github.com/DSpace/DSpace/issues/8549">an issue on DSpace</a> for the ImageMagick <code>CropBox</code> problem
+<ul>
+<li>I decided that this is a bug that should be fixed separately from the &ldquo;improving thumbnail quality&rdquo; issue</li>
+<li>I made <a href="https://github.com/DSpace/DSpace/pull/8550">a pull request</a> to fix the <code>CropBox</code> issue</li>
+</ul>
+</li>
+<li>I did more work on my <a href="https://github.com/alanorth/improved-dspace-thumbnails/">improved-dspace-thumbnails</a> microsite to complement the DSpace thumbnail pull requests
+<ul>
+<li>I am updating it to recommend using the PDF cropbox and &ldquo;supersampling&rdquo; with a higher density than 72</li>
+<li>I measured execution time of ImageMagick with <code>time</code> and found that the higher-density mode takes about five times longer on average</li>
+<li>I measured the <a href="https://stackoverflow.com/a/131346">maximum heap memory of ImageMagick with Valgrind and Massif</a>:</li>
+</ul>
+</li>
+</ul>
+<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>$ valgrind --tool<span style="color:#f92672">=</span>massif magick convert ...
+</span></span></code></pre></div><ul>
+<li>Then I checked the results for each set of default DSpace thumbnail runs and &ldquo;improved&rdquo; thumbnail runs using <code>ms_print</code> (hacky way to get the max heap, I know):</li>
+</ul>
+<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>$ <span style="color:#66d9ef">for</span> file in memory-dspace/massif.out.49*; <span style="color:#66d9ef">do</span> ms_print <span style="color:#e6db74">&#34;</span>$file<span style="color:#e6db74">&#34;</span> | grep -A1 <span style="color:#e6db74">&#34;    MB&#34;</span> | tail -n1 | sed <span style="color:#e6db74">&#39;s/\^.*//&#39;</span>; <span style="color:#66d9ef">done</span>
+</span></span><span style="display:flex;"><span>15.87
+</span></span><span style="display:flex;"><span>16.06
+</span></span><span style="display:flex;"><span>21.26
+</span></span><span style="display:flex;"><span>15.88
+</span></span><span style="display:flex;"><span>20.01
+</span></span><span style="display:flex;"><span>15.85
+</span></span><span style="display:flex;"><span>20.06
+</span></span><span style="display:flex;"><span>16.04
+</span></span><span style="display:flex;"><span>15.87
+</span></span><span style="display:flex;"><span>15.87
+</span></span><span style="display:flex;"><span>20.02
+</span></span><span style="display:flex;"><span>15.87
+</span></span><span style="display:flex;"><span>15.86
+</span></span><span style="display:flex;"><span>19.92
+</span></span><span style="display:flex;"><span>10.89
+</span></span><span style="display:flex;"><span>$ <span style="color:#66d9ef">for</span> file in memory-improved/massif.out.5*; <span style="color:#66d9ef">do</span> ms_print <span style="color:#e6db74">&#34;</span>$file<span style="color:#e6db74">&#34;</span> | grep -A1 <span style="color:#e6db74">&#34;    MB&#34;</span> | tail -n1 | sed <span style="color:#e6db74">&#39;s/\^.*//&#39;</span>; <span style="color:#66d9ef">done</span>
+</span></span><span style="display:flex;"><span>245.3
+</span></span><span style="display:flex;"><span>245.5
+</span></span><span style="display:flex;"><span>298.6
+</span></span><span style="display:flex;"><span>245.3
+</span></span><span style="display:flex;"><span>306.8
+</span></span><span style="display:flex;"><span>245.2
+</span></span><span style="display:flex;"><span>306.9
+</span></span><span style="display:flex;"><span>245.5
+</span></span><span style="display:flex;"><span>245.2
+</span></span><span style="display:flex;"><span>245.3
+</span></span><span style="display:flex;"><span>306.8
+</span></span><span style="display:flex;"><span>245.3
+</span></span><span style="display:flex;"><span>244.9
+</span></span><span style="display:flex;"><span>306.3
+</span></span><span style="display:flex;"><span>165.6
+</span></span></code></pre></div><ul>
+<li>Ouch, this shows that it takes about <em>fifteen times</em> more memory to do the &ldquo;4x&rdquo; density of 288!
+<ul>
+<li>It seems more reasonable to use a &ldquo;2x&rdquo; density of 144:</li>
+</ul>
+</li>
+</ul>
+<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>$ <span style="color:#66d9ef">for</span> file in memory-improved-144/*; <span style="color:#66d9ef">do</span> ms_print <span style="color:#e6db74">&#34;</span>$file<span style="color:#e6db74">&#34;</span> | grep -A1 <span style="color:#e6db74">&#34;    MB&#34;</span> | tail -n1 | sed <span style="color:#e6db74">&#39;s/\^.*//&#39;</span>; <span style="color:#66d9ef">done</span>
+</span></span><span style="display:flex;"><span>61.80
+</span></span><span style="display:flex;"><span>62.00
+</span></span><span style="display:flex;"><span>76.76
+</span></span><span style="display:flex;"><span>61.82
+</span></span><span style="display:flex;"><span>77.43
+</span></span><span style="display:flex;"><span>61.77
+</span></span><span style="display:flex;"><span>77.48
+</span></span><span style="display:flex;"><span>61.98
+</span></span><span style="display:flex;"><span>61.76
+</span></span><span style="display:flex;"><span>61.81
+</span></span><span style="display:flex;"><span>77.44
+</span></span><span style="display:flex;"><span>61.81
+</span></span><span style="display:flex;"><span>61.69
+</span></span><span style="display:flex;"><span>77.16
+</span></span><span style="display:flex;"><span>41.84
+</span></span></code></pre></div><ul>
+<li>There&rsquo;s a really cool visualizer called massif-visualizer, but it isn&rsquo;t easy to parse</li>
+</ul>
+<h2 id="2022-10-28">2022-10-28</h2>
+<ul>
+<li>I finalized the code for the ImageMagick density change and made a <a href="https://github.com/DSpace/DSpace/pull/8553">pull request</a> against DSpace 7.x</li>
+</ul>
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 <meta property="og:url" content="https://alanorth.github.io/cgspace-notes/" />
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docs/posts/page/7/index.html

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docs/posts/page/8/index.html

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docs/posts/page/9/index.html

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docs/sitemap.xml

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