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<li>on <a href="https://github.com/lemire/">GitHub</a> with over <a href="https://github.com/lemire?tab=followers">2k&nbsp;followers</a>,</li>
<li>on <a href="https://scholar.google.com/citations?user=q1ja-G8AAAAJ">Google Scholar</a> with 3k&nbsp;citations and over 70 peer-reviewed publications,</li>
<li>on <a href="https://www.facebook.com/daniel.lemire">Facebook</a>,</li>
<li>and on <a href="https://www.linkedin.com/in/dlemire">LinkedIn</a>.</li>
</ul>
If you want to meet Daniel in person, he organizes regular talks open to the public in Montreal (typically in French): <a href="https://tribalab.wordpress.com">tribalab</a> and <a href="https://technolab.fun">technolab</a> .</div></aside><aside id="search-3" class="widget widget_search"><form role="search" method="get" class="search-form" action="https://lemire.me/blog/">
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</form></aside><aside id="custom_html-5" class="widget_text widget widget_custom_html"><h2 class="widget-title">Support my work!</h2><div class="textwidget custom-html-widget">I do not accept any advertisement. However, you can support the blog with <a href="https://www.paypal.me/daniellemirephd/25">donations through paypal</a>. Please consider getting in touch if you are a supporter so that I can thank you.</div></aside> <aside id="recent-posts-2" class="widget widget_recent_entries"> <h2 class="widget-title">Recent Posts</h2> <ul>
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<a href="https://lemire.me/blog/2019/12/14/science-and-technology-links-december-14th-2019/">Science and Technology links (December 14th 2019)</a>
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<a href="https://lemire.me/blog/2019/12/12/are-64-bit-random-identifiers-free-from-collision/">Are 64-bit random identifiers free from collision?</a>
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<li>
<a href="https://lemire.me/blog/2019/12/11/amazons-new-arm-servers-graviton-2/">Amazon&#8217;s new ARM servers: Graviton 2</a>
</li>
<li>
<a href="https://lemire.me/blog/2019/12/07/science-and-technology-links-december-7th-2019/">Science and Technology links (December 7th 2019)</a>
</li>
<li>
<a href="https://lemire.me/blog/2019/12/06/amd-zen-2-and-branch-mispredictions/">AMD Zen 2 and branch mispredictions</a>
</li>
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</aside><aside id="recent-comments-3" class="widget widget_recent_comments"><h2 class="widget-title">Recent Comments</h2><ul id="recentcomments"><li class="recentcomments"><span class="comment-author-link"><a href="https://lemire.me/en/" rel='external nofollow ugc' class='url'>Daniel Lemire</a></span> on <a href="https://lemire.me/blog/2019/12/14/science-and-technology-links-december-14th-2019/#comment-468078">Science and Technology links (December 14th 2019)</a></li><li class="recentcomments"><span class="comment-author-link">Jamie_NYC</span> on <a href="https://lemire.me/blog/2019/12/14/science-and-technology-links-december-14th-2019/#comment-467947">Science and Technology links (December 14th 2019)</a></li><li class="recentcomments"><span class="comment-author-link"><a href='http://h2database.com' rel='external nofollow ugc' class='url'>Thomas Müller Graf</a></span> on <a href="https://lemire.me/blog/2019/12/12/are-64-bit-random-identifiers-free-from-collision/#comment-467558">Are 64-bit random identifiers free from collision?</a></li><li class="recentcomments"><span class="comment-author-link">Peter</span> on <a href="https://lemire.me/blog/2019/12/12/are-64-bit-random-identifiers-free-from-collision/#comment-466631">Are 64-bit random identifiers free from collision?</a></li><li class="recentcomments"><span class="comment-author-link">Peter</span> on <a href="https://lemire.me/blog/2019/12/12/are-64-bit-random-identifiers-free-from-collision/#comment-466623">Are 64-bit random identifiers free from collision?</a></li></ul></aside><aside id="pages-3" class="widget widget_pages"><h2 class="widget-title">Pages</h2> <ul>
<li class="page_item page-item-14034"><a href="https://lemire.me/blog/a-short-history-of-technology/">A short history of technology</a></li>
<li class="page_item page-item-345"><a href="https://lemire.me/blog/about-me/">About me</a></li>
<li class="page_item page-item-4194"><a href="https://lemire.me/blog/book-recommendations/">Book recommendations</a></li>
<li class="page_item page-item-12110"><a href="https://lemire.me/blog/my-bets/">My bets</a></li>
<li class="page_item page-item-14029"><a href="https://lemire.me/blog/my-favorite-articles/">My favorite articles</a></li>
<li class="page_item page-item-1794"><a href="https://lemire.me/blog/my-readers/">My readers</a></li>
<li class="page_item page-item-8035"><a href="https://lemire.me/blog/predictions/">Predictions</a></li>
<li class="page_item page-item-987"><a href="https://lemire.me/blog/terms-of-use/">Terms of use</a></li>
<li class="page_item page-item-725"><a href="https://lemire.me/blog/rules-to-write-a-good-research-paper/">Write good papers</a></li>
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<option value='https://lemire.me/blog/2019/12/'> December 2019 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2019/11/'> November 2019 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2019/10/'> October 2019 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2019/09/'> September 2019 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2019/08/'> August 2019 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2019/07/'> July 2019 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2019/06/'> June 2019 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2019/05/'> May 2019 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2019/04/'> April 2019 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2019/03/'> March 2019 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2019/02/'> February 2019 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2019/01/'> January 2019 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2018/12/'> December 2018 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2018/11/'> November 2018 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2018/10/'> October 2018 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2018/09/'> September 2018 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2018/08/'> August 2018 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2018/07/'> July 2018 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2018/06/'> June 2018 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2018/05/'> May 2018 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2018/04/'> April 2018 &nbsp;(12)</option>
<option value='https://lemire.me/blog/2018/03/'> March 2018 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2018/02/'> February 2018 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2018/01/'> January 2018 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2017/12/'> December 2017 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2017/11/'> November 2017 &nbsp;(16)</option>
<option value='https://lemire.me/blog/2017/10/'> October 2017 &nbsp;(13)</option>
<option value='https://lemire.me/blog/2017/09/'> September 2017 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2017/08/'> August 2017 &nbsp;(12)</option>
<option value='https://lemire.me/blog/2017/07/'> July 2017 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2017/06/'> June 2017 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2017/05/'> May 2017 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2017/04/'> April 2017 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2017/03/'> March 2017 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2017/02/'> February 2017 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2017/01/'> January 2017 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2016/12/'> December 2016 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2016/11/'> November 2016 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2016/10/'> October 2016 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2016/09/'> September 2016 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2016/08/'> August 2016 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2016/07/'> July 2016 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2016/06/'> June 2016 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2016/05/'> May 2016 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2016/04/'> April 2016 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2016/03/'> March 2016 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2016/02/'> February 2016 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2016/01/'> January 2016 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2015/12/'> December 2015 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2015/11/'> November 2015 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2015/10/'> October 2015 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2015/09/'> September 2015 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2015/08/'> August 2015 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2015/07/'> July 2015 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2015/06/'> June 2015 &nbsp;(2)</option>
<option value='https://lemire.me/blog/2015/05/'> May 2015 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2015/04/'> April 2015 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2015/03/'> March 2015 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2015/02/'> February 2015 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2015/01/'> January 2015 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2014/12/'> December 2014 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2014/11/'> November 2014 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2014/10/'> October 2014 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2014/09/'> September 2014 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2014/08/'> August 2014 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2014/07/'> July 2014 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2014/06/'> June 2014 &nbsp;(2)</option>
<option value='https://lemire.me/blog/2014/05/'> May 2014 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2014/04/'> April 2014 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2014/03/'> March 2014 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2014/02/'> February 2014 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2014/01/'> January 2014 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2013/12/'> December 2013 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2013/11/'> November 2013 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2013/10/'> October 2013 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2013/09/'> September 2013 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2013/08/'> August 2013 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2013/07/'> July 2013 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2013/06/'> June 2013 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2013/05/'> May 2013 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2013/04/'> April 2013 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2013/03/'> March 2013 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2013/02/'> February 2013 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2013/01/'> January 2013 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2012/12/'> December 2012 &nbsp;(2)</option>
<option value='https://lemire.me/blog/2012/11/'> November 2012 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2012/10/'> October 2012 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2012/09/'> September 2012 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2012/08/'> August 2012 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2012/07/'> July 2012 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2012/06/'> June 2012 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2012/05/'> May 2012 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2012/04/'> April 2012 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2012/03/'> March 2012 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2012/02/'> February 2012 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2012/01/'> January 2012 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2011/12/'> December 2011 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2011/11/'> November 2011 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2011/10/'> October 2011 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2011/09/'> September 2011 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2011/08/'> August 2011 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2011/07/'> July 2011 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2011/06/'> June 2011 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2011/05/'> May 2011 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2011/04/'> April 2011 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2011/03/'> March 2011 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2011/02/'> February 2011 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2011/01/'> January 2011 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2010/12/'> December 2010 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2010/11/'> November 2010 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2010/10/'> October 2010 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2010/09/'> September 2010 &nbsp;(3)</option>
<option value='https://lemire.me/blog/2010/08/'> August 2010 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2010/07/'> July 2010 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2010/06/'> June 2010 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2010/05/'> May 2010 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2010/04/'> April 2010 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2010/03/'> March 2010 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2010/02/'> February 2010 &nbsp;(5)</option>
<option value='https://lemire.me/blog/2010/01/'> January 2010 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2009/12/'> December 2009 &nbsp;(4)</option>
<option value='https://lemire.me/blog/2009/11/'> November 2009 &nbsp;(6)</option>
<option value='https://lemire.me/blog/2009/10/'> October 2009 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2009/09/'> September 2009 &nbsp;(8)</option>
<option value='https://lemire.me/blog/2009/08/'> August 2009 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2009/07/'> July 2009 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2009/06/'> June 2009 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2009/05/'> May 2009 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2009/04/'> April 2009 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2009/03/'> March 2009 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2009/02/'> February 2009 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2009/01/'> January 2009 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2008/12/'> December 2008 &nbsp;(16)</option>
<option value='https://lemire.me/blog/2008/11/'> November 2008 &nbsp;(25)</option>
<option value='https://lemire.me/blog/2008/10/'> October 2008 &nbsp;(13)</option>
<option value='https://lemire.me/blog/2008/09/'> September 2008 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2008/08/'> August 2008 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2008/07/'> July 2008 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2008/06/'> June 2008 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2008/05/'> May 2008 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2008/04/'> April 2008 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2008/03/'> March 2008 &nbsp;(18)</option>
<option value='https://lemire.me/blog/2008/02/'> February 2008 &nbsp;(12)</option>
<option value='https://lemire.me/blog/2008/01/'> January 2008 &nbsp;(19)</option>
<option value='https://lemire.me/blog/2007/12/'> December 2007 &nbsp;(24)</option>
<option value='https://lemire.me/blog/2007/11/'> November 2007 &nbsp;(23)</option>
<option value='https://lemire.me/blog/2007/10/'> October 2007 &nbsp;(19)</option>
<option value='https://lemire.me/blog/2007/09/'> September 2007 &nbsp;(13)</option>
<option value='https://lemire.me/blog/2007/08/'> August 2007 &nbsp;(23)</option>
<option value='https://lemire.me/blog/2007/07/'> July 2007 &nbsp;(18)</option>
<option value='https://lemire.me/blog/2007/06/'> June 2007 &nbsp;(15)</option>
<option value='https://lemire.me/blog/2007/05/'> May 2007 &nbsp;(19)</option>
<option value='https://lemire.me/blog/2007/04/'> April 2007 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2007/03/'> March 2007 &nbsp;(7)</option>
<option value='https://lemire.me/blog/2007/02/'> February 2007 &nbsp;(27)</option>
<option value='https://lemire.me/blog/2007/01/'> January 2007 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2006/12/'> December 2006 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2006/11/'> November 2006 &nbsp;(18)</option>
<option value='https://lemire.me/blog/2006/10/'> October 2006 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2006/09/'> September 2006 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2006/08/'> August 2006 &nbsp;(25)</option>
<option value='https://lemire.me/blog/2006/07/'> July 2006 &nbsp;(10)</option>
<option value='https://lemire.me/blog/2006/06/'> June 2006 &nbsp;(18)</option>
<option value='https://lemire.me/blog/2006/05/'> May 2006 &nbsp;(27)</option>
<option value='https://lemire.me/blog/2006/04/'> April 2006 &nbsp;(25)</option>
<option value='https://lemire.me/blog/2006/03/'> March 2006 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2006/02/'> February 2006 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2006/01/'> January 2006 &nbsp;(39)</option>
<option value='https://lemire.me/blog/2005/12/'> December 2005 &nbsp;(23)</option>
<option value='https://lemire.me/blog/2005/11/'> November 2005 &nbsp;(25)</option>
<option value='https://lemire.me/blog/2005/10/'> October 2005 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2005/09/'> September 2005 &nbsp;(26)</option>
<option value='https://lemire.me/blog/2005/08/'> August 2005 &nbsp;(39)</option>
<option value='https://lemire.me/blog/2005/07/'> July 2005 &nbsp;(17)</option>
<option value='https://lemire.me/blog/2005/06/'> June 2005 &nbsp;(16)</option>
<option value='https://lemire.me/blog/2005/05/'> May 2005 &nbsp;(9)</option>
<option value='https://lemire.me/blog/2005/04/'> April 2005 &nbsp;(13)</option>
<option value='https://lemire.me/blog/2005/03/'> March 2005 &nbsp;(30)</option>
<option value='https://lemire.me/blog/2005/02/'> February 2005 &nbsp;(20)</option>
<option value='https://lemire.me/blog/2005/01/'> January 2005 &nbsp;(30)</option>
<option value='https://lemire.me/blog/2004/12/'> December 2004 &nbsp;(11)</option>
<option value='https://lemire.me/blog/2004/11/'> November 2004 &nbsp;(19)</option>
<option value='https://lemire.me/blog/2004/10/'> October 2004 &nbsp;(14)</option>
<option value='https://lemire.me/blog/2004/09/'> September 2004 &nbsp;(17)</option>
<option value='https://lemire.me/blog/2004/08/'> August 2004 &nbsp;(13)</option>
<option value='https://lemire.me/blog/2004/07/'> July 2004 &nbsp;(16)</option>
<option value='https://lemire.me/blog/2004/06/'> June 2004 &nbsp;(16)</option>
<option value='https://lemire.me/blog/2004/05/'> May 2004 &nbsp;(12)</option>
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<article id="post-17725" class="post-17725 post type-post status-publish format-standard hentry category-84">
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<h1 class="entry-title">JSON parsing: simdjson vs. JSON for Modern C++</h1> </header>
<div class="entry-content">
<p>JSON is the ubiquitous data format on the Internet. There is a lot of JSON that needs to be parsed and validated.</p>
<p>As we just released the latest version of our fast JSON parser (<a href="https://github.com/lemire/simdjson">simdjson</a>), a reader of this blog asked how it compared in speed against one of the nicest C++ JSON libraries: JSON for Modern C++ (<a href="https://github.com/nlohmann/json">nlohmann/json</a>).</p>
<p>We have not reported on benchmarks against &#8220;JSON for Modern C++&#8221; because we knew that it was not designed for raw speed. It is designed for ease-of-use: it makes the life of the programmer as easy as possible. In contrast, simdjson optimizes for speed, even when it requires a bit more work from the programmer. Nevertheless, it is still interesting to compare speed, to know what your trade-off is.</p>
<p>Let us run some benchmarks&#8230; I use a Skylake processor with GNU GCC 8.3.</p>
<table>
<tbody>
<tr>
<th>file</th>
<th>simdjson</th>
<th>JSON for Modern C++</th>
</tr>
<tr>
<td>apache_builds</td>
<td>2.3 GB/s</td>
<td>0.098 GB/s</td>
</tr>
<tr>
<td>github_events</td>
<td>2.5 GB/s</td>
<td>0.093 GB/s</td>
</tr>
<tr>
<td>gsoc-2018</td>
<td>3.3 GB/s</td>
<td>0.091 GB/s</td>
</tr>
<tr>
<td>twitter</td>
<td>2.2 GB/s</td>
<td>0.094 GB/s</td>
</tr>
</tbody>
</table>
<p>Thus, roughly speaking, simdjson can parse, validate a JSON document and create a DOM tree, at a speed of about 2 GB/s. The easier-to-use &#8220;JSON for Modern C++&#8221; has a speed of about 0.1 GB/s, so about 20x slower. As a reference, we can easily read files from disk or the network at speeds higher than 2 GB/s.</p>
<p>Link: <a href="https://github.com/lemire/simdjson">simdjson</a>.</p>
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<span class="posted-on"><span class="screen-reader-text">Posted on </span><a href="https://lemire.me/blog/2019/08/02/json-parsing-simdjson-vs-json-for-modern-c/" rel="bookmark"><time class="entry-date published" datetime="2019-08-02T15:57:41+00:00">August 2, 2019</time><time class="updated" datetime="2019-08-02T16:03:18+00:00">August 2, 2019</time></a></span><span class="byline"><span class="author vcard"><span class="screen-reader-text">Author </span><a class="url fn n" href="https://lemire.me/blog/author/lemire/">Daniel Lemire</a></span></span><span class="cat-links"><span class="screen-reader-text">Categories </span><a href="https://lemire.me/blog/category/84/" rel="category tag"></a></span> </footer>
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5 thoughts on &ldquo;JSON parsing: simdjson vs. JSON for Modern C++&rdquo; </h2>
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August 3, 2019 at 4:11 am </time>
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<p>Thanks, for posting this.</p>
<p>That is well a mega difference, very impressive. I&#8217;m just using it [nlohmann/json] for some settings and some data from the web, so speed is not relevant, but if it got to be relevant for another application, I&#8217;d definitely look into simdjson.</p>
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August 5, 2019 at 2:51 am </time>
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<p>vcpkg has simdjson in its repo (for those that did not know).</p>
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August 5, 2019 at 1:46 pm </time>
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<p>We are working toward releasing version 0.2 on vcpkg.</p>
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August 5, 2019 at 4:43 pm </time>
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<p>Daniel, you wrote &#8220;[JSON for Modern C++] is designed for ease-of-use: it makes the life of the programmer as easy as possible. In contrast, simdjson optimizes for speed, even when it requires a bit more work from the programmer.&#8221; As a programmer I never used simdjson, but have some experience with nlohmann/json and I&#8217;m wondering how difficult to use your library is.</p>
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August 5, 2019 at 8:28 pm </time>
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<p>We support a conventional DOM traversal as well as JSON pointers. Our DOM tree is immutable.</p>
<p>Please try it out!</p>
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