<p>Parallel processing is used only when indexes are created and<br>
in the second processing stage of updates. In both cases the<br>
number of parallel threads should not be too high. Indexing<br>
requires a lot of memory and having too many in parallel running<br>
actually slows down the process. Updates are generally run in<br>
parallel with other load (like rendering) and should therefore<br>
also not take up too many CPUs.</p>
<p><span class="issue-keyword tooltipped tooltipped-se" aria-label="This pull request closes issue #885.">Fixes</span> <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="388745926" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/osm2pgsql/issues/885" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/osm2pgsql/issues/885/hovercard" href="https://github.com/openstreetmap/osm2pgsql/issues/885">#885</a>.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/osm2pgsql/pull/959'>https://github.com/openstreetmap/osm2pgsql/pull/959</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Reduce max number of default parallel threads to 4</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/959/files#diff-0">options.cpp</a>
    (3)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/959.patch'>https://github.com/openstreetmap/osm2pgsql/pull/959.patch</a></li>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/959.diff'>https://github.com/openstreetmap/osm2pgsql/pull/959.diff</a></li>
</ul>

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