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<meta property="og:title" content=" December, 2015 · CGSpace Notes" />
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December, 2015 · CGSpace Notes
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<header class="global-header" style="background-image:url(../images/bg.jpg )">
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<h1><a href="/cgspace-notes/">CGSpace Notes</a></h1>
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<h1 class="text-primary">December, 2015</h1>
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Posted on
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<time datetime="2015-12-02T13:18:00+03:00">
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Dec 2, 2015
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<span class="post-tag small"><a href="/cgspace-notes//tags/notes">#notes</a></span>
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<section>
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<h2 id="2015-12-02:012a628feed6d64ae1151cbd6151ccd6">2015-12-02</h2>
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<ul>
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<li>Replace <code>lzop</code> with <code>xz</code> in log compression cron jobs on DSpace Test—it uses less space:</li>
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</ul>
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<pre><code># cd /home/dspacetest.cgiar.org/log
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# ls -lh dspace.log.2015-11-18*
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-rw-rw-r-- 1 tomcat7 tomcat7 2.0M Nov 18 23:59 dspace.log.2015-11-18
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-rw-rw-r-- 1 tomcat7 tomcat7 387K Nov 18 23:59 dspace.log.2015-11-18.lzo
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-rw-rw-r-- 1 tomcat7 tomcat7 169K Nov 18 23:59 dspace.log.2015-11-18.xz
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</code></pre>
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<ul>
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<li>I had used lrzip once, but it needs more memory and is harder to use as it requires the lrztar wrapper</li>
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<li>Need to remember to go check if everything is ok in a few days and then change CGSpace</li>
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<li>CGSpace went down again (due to PostgreSQL idle connections of course)</li>
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<li>Current database settings for DSpace are <code>db.maxconnections = 30</code> and <code>db.maxidle = 8</code>, yet idle connections are exceeding this:</li>
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</ul>
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<pre><code>$ psql -c 'SELECT * from pg_stat_activity;' | grep cgspace | grep -c idle
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39
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</code></pre>
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<ul>
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<li>I restarted PostgreSQL and Tomcat and it’s back</li>
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<li>On a related note of why CGSpace is so slow, I decided to finally try the <code>pgtune</code> script to tune the postgres settings:</li>
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</ul>
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<pre><code># apt-get install pgtune
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# pgtune -i /etc/postgresql/9.3/main/postgresql.conf -o postgresql.conf-pgtune
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# mv /etc/postgresql/9.3/main/postgresql.conf /etc/postgresql/9.3/main/postgresql.conf.orig
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# mv postgresql.conf-pgtune /etc/postgresql/9.3/main/postgresql.conf
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</code></pre>
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<ul>
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<li>It introduced the following new settings:</li>
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</ul>
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<pre><code>default_statistics_target = 50
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maintenance_work_mem = 480MB
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constraint_exclusion = on
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checkpoint_completion_target = 0.9
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effective_cache_size = 5632MB
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work_mem = 48MB
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wal_buffers = 8MB
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checkpoint_segments = 16
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shared_buffers = 1920MB
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max_connections = 80
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</code></pre>
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<ul>
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<li>Now I need to go read PostgreSQL docs about these options, and watch memory settings in munin etc</li>
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<li>For what it’s worth, now the REST API should be faster (because of these PostgreSQL tweaks):</li>
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</ul>
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<pre><code>$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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1.474
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$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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2.141
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$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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1.685
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$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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1.995
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$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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1.786
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</code></pre>
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<ul>
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<li>Last week it was an average of 8 seconds… now this is <sup>1</sup>⁄<sub>4</sub> of that</li>
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<h1 class="author-name text-primary">Alan Orth</h1>
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