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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">雅虎研究员将圆周率精确到小数点后2千万亿位 </h1> <p class="xg1"> 时间：2010-9-21 16:58<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1550)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>据英国广播公司（BBC）9月17日报道，数学家热衷于计算圆周率的小数位数，将此视为不错的消遣。不久前，日本一名男子刚刚创下将圆周率精确到小数点后5万亿位的新纪录。日前，雅虎公司的一名研究员采用“云计算”技术， ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><P><A href="http://www.oecr.com/data/attachment/portal/201009/21/165749svrqrlxacvcnappy.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201009/21/165749svrqrlxacvcnappy.jpg"></A></P> <P>据英国广播公司（BBC）9月17日报道，数学家热衷于计算圆周率的小数位数，将此视为不错的消遣。不久前，日本一名男子刚刚创下将圆周率精确到小数点后5万亿位的新纪录。日前，雅虎公司的一名研究员采用“云计算”技术，将圆周率精确到小数点后2千万亿位。<BR> <BR>雅虎科技公司的研究员尼古拉斯·斯则（Nicholas Sze），采用“云计算”技术，利用1000台电脑同时计算，历时23天，将圆周率精确到小数点后2千万亿位。期间，每台计算机都要运行不同的公式，将圆周率复杂的公式分解成更小的数学问题，然后再将它们综合到一起，得出圆周率的精确数值。<BR> <BR>斯则利用了MapReduce方法，这种方法曾经是谷歌开发的一项重要技术，用以进行大数据量的计算。斯则的计算量相当于一台计算机工作500年。</P></td></tr></table> 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