<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="static/style.xsl"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-09-18T18:36:20Z</responseDate><request verb="GetRecord" identifier="oai:dspace.mit.edu:1721.1/128317" metadataPrefix="dim">https://dspace.mit.edu/server/oai/request</request><GetRecord><record><header><identifier>oai:dspace.mit.edu:1721.1/128317</identifier><datestamp>2026-06-17T14:45:09Z</datestamp><setSpec>com_1721.1_7582</setSpec><setSpec>com_1721.1_7581</setSpec><setSpec>col_1721.1_131022</setSpec></header><metadata><dim:dim xmlns:dim="http://www.dspace.org/xmlns/dspace/dim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.dspace.org/xmlns/dspace/dim http://www.dspace.org/schema/dim.xsd">
   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">Nir Shavit.</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="author" lang="en_US">Leiserson, William Mitchell.</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="other" lang="en_US">Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="department" lang="en_US">Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2020-11-03T20:30:16Z</dim:field>
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   <dim:field mdschema="dc" element="date" qualifier="copyright" lang="en_US">2020</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">2020</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">https://hdl.handle.net/1721.1/128317</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="oclc" lang="en_US">1201306991</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2020</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Cataloged from PDF of thesis.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Includes bibliographical references (pages 149-156).</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="abstract" lang="en_US">Performance engineering is performed in languages that are close to the machine, especially C and C++, but these languages have little native support for concurrency. We're deep into the multicore era of computer hardware, however, meaning that scalability is dependent upon concurrent data structures. Contrast this with modern systems languages, like Go, that provide support for concurrency but incur invisible, sometimes unavoidable, overheads on basic operations. Many applications, particularly in scientific computing, require something in between. In this thesis, I present DEF, a language that's close to the machine for the sake of performance engineering, but which also has features that provide support for concurrency. These features are designed with costs that don't impede code that doesn't use them, and preserve the flexibility enjoyed by C programmers in organizing memory layout and operations. DEF occupies the excluded middle between the two categories of languages and is suitable for high performance, scalable applications.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="statementofresponsibility" lang="en_US">by William Mitchell Leiserson.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="degree" lang="en_US">Ph.D.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="collection" lang="en_US">Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science</dim:field>
   <dim:field mdschema="dc" element="format" qualifier="extent" lang="en_US">156 pages</dim:field>
   <dim:field mdschema="dc" element="language" qualifier="iso" lang="en_US">eng</dim:field>
   <dim:field mdschema="dc" element="publisher" lang="en_US">Massachusetts Institute of Technology</dim:field>
   <dim:field mdschema="dc" element="rights" lang="en_US">MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.</dim:field>
   <dim:field mdschema="dc" element="rights" qualifier="uri" lang="en_US">http://dspace.mit.edu/handle/1721.1/7582</dim:field>
   <dim:field mdschema="dc" element="subject" lang="en_US">Electrical Engineering and Computer Science.</dim:field>
   <dim:field mdschema="dc" element="title" lang="en_US">Defining scalable high performance programming with DEF</dim:field>
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   	&lt;Title>Defining scalable high performance programming with DEF&lt;/Title>
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   	&lt;PublicationDate>2020&lt;/PublicationDate>
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    &lt;Keyword>Electrical Engineering and Computer Science.&lt;/Keyword>
   	&lt;Abstract>Performance engineering is performed in languages that are close to the machine, especially C and C++, but these languages have little native support for concurrency. We&amp;apos;re deep into the multicore era of computer hardware, however, meaning that scalability is dependent upon concurrent data structures. Contrast this with modern systems languages, like Go, that provide support for concurrency but incur invisible, sometimes unavoidable, overheads on basic operations. Many applications, particularly in scientific computing, require something in between. In this thesis, I present DEF, a language that&amp;apos;s close to the machine for the sake of performance engineering, but which also has features that provide support for concurrency. These features are designed with costs that don&amp;apos;t impede code that doesn&amp;apos;t use them, and preserve the flexibility enjoyed by C programmers in organizing memory layout and operations. DEF occupies the excluded middle between the two categories of languages and is suitable for high performance, scalable applications.&lt;/Abstract>
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