Object code optimizer: Difference between revisions

Revision as of 17:19, 27 October 2021

Revision as of 15:51, 30 October 2021

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* "[[IBM]] Automatic Binary Optimizer for z/OS<ref name=autogenerated1>{{Cite web|url=https://www.ibm.com/products/automatic-binary-optimizer-zos|title=IBM Automatic Binary Optimizer for z/OS - Overview|website=www.ibm.com|access-date=2020-05-15 |archive-date=2020-10-18 |archive-url=https://web.archive.org/web/20201018172402/https://www.ibm.com/products/automatic-binary-optimizer-zos|url-status=live}}</ref>" (ABO) was introduced in 2015 as a cutting-edge technology designed to optimize the performance of [[COBOL]] applications on [[IBM Z]]<ref>{{Cite web|url=https://www.ibm.com/it-infrastructure/z|title=IBM Z Mainframe Servers and Software|website=www.ibm.com|access-date=2018-08-23 |archive-date=2017-12-22 |archive-url=https://web.archive.org/web/20171222051401/https://www.ibm.com/it-infrastructure/z|url-status=live}}</ref> mainframes without the need for recompiling source. It uses advanced optimization technology shipped in the latest Enterprise COBOL.<ref>{{Cite web|url=https://www.ibm.com/products/cobol-compiler-zos|title=IBM Enterprise COBOL for z/OS - Overview|website=www.ibm.com|access-date=2021-10-27 |archive-date=2021-09-23 |archive-url=https://web.archive.org/web/20210923110834/https://www.ibm.com/products/cobol-compiler-zos|url-status=live}}</ref> ABO optimizes compiled [[binaries]] without affecting program logic. As a result, the application runs faster but behavior remains unchanged so testing effort could be reduced. Clients normally don't [[recompile]] 100 percent of their code when they upgrade to new compiler or IBM Z hardware levels, so code that's not recompiled wouldn't be able to take advantage of features in new IBM Z hardware. Now with ABO, clients have one more option to reduce [[CPU]] utilization and operating costs of their business-critical COBOL applications. You can try ABO out with an improved, easy-to-use ABO Trial Cloud Service <ref name=autogenerated2>{{Cite web|url=https://optimizer.ibm.com/|title=IBM Automatic Binary Optimizer for z/OS Trial Cloud Service|website=optimizer.ibm.com|access-date=2021-10-27 |archive-date=2021-01-19 |archive-url=https://web.archive.org/web/20210119201500/https://optimizer.ibm.com/|url-status=live}}</ref> without installing ABO on your system.

* The earliest "COBOL Optimizer" was developed by [[Capex Corporation]] in the mid 1970s for [[COBOL]]. This type of optimizer depended, in this case, upon knowledge of 'weaknesses' in the standard IBM COBOL compiler, and actually replaced (or [[patch (computing)|patch]]ed) sections of the object code with more efficient code. The replacement code might replace a linear [[lookup table|table lookup]] with a [[binary search algorithm|binary search]] for example or sometimes simply replace a relatively slow instruction with a known faster one that was otherwise functionally equivalent within its context. This technique is now known as [[strength reduction]]. For example, on the [[IBM/360]] hardware the <code>CLI</code> instruction was, depending on the particular model, between twice and 5 times as fast as a <code>CLC</code> instruction for single byte comparisons.<ref>{{Cite web |url=http://www.bitsavers.org/pdf/ibm/360/A22_6825-1_360instrTiming.pdf |title=Archived copy |access-date=2010-01-07 |archive-date=2010-07-11 |archive-url=https://web.archive.org/web/20100711101128/http://bitsavers.org/pdf/ibm/360/A22_6825-1_360instrTiming.pdf |url-status=dead }}</ref><ref>{{Cite journal|url=https://doi.org/10.1145/358728.358732|title=Software engineering for the Cobol environment|first=Michael|last=Evans|date=1 December 1982|journal=Communications of the ACM|volume=25|issue=12|pages=874–882|via=Dec 1982|doi=10.1145/358728.358732|s2cid=17268690|access-date=2021-10-27 |archive-date=2021-10-27 |archive-url=https://web.archive.org/web/20211027171912/https://dl.acm.org/doi/10.1145/358728.358732|url-status=live}}</ref>

===Advantages===

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* [[IBM]] Automatic Binary Optimizer for z/OS (ABO)Trial Cloud Service (2020)<ref name=autogenerated2 />

* [[The Sun Studio Binary Code Optimizer]]<ref>{{Cite web |url=http://developers.sun.com/solaris/articles/binopt.html |title=Archived copy |access-date=2010-01-07 |archive-date=2010-07-22 |archive-url=https://web.archive.org/web/20100722060415/http://developers.sun.com/solaris/articles/binopt.html |url-status=live }}</ref> - which requires a [[software performance analysis|profile]] phase beforehand

* Design and Engineering of a Dynamic Binary Optimizer - from [[IBM]] T. J. Watson Res. Center (February 2005)<ref>{{Cite journal |doi = 10.1109/JPROC.2004.840302|title = Design and Engineering of a Dynamic Binary Optimizer|year = 2005|last1 = Duesterwald|first1 = E.|journal = Proceedings of the IEEE|volume = 93|issue = 2|pages = 436–448|s2cid = 2217101}}</ref><ref>{{Cite webbook|chapter-url=https://doi.org/10.1145/1254810.1254831|titlechapter=Metadata driven memory optimizations in dynamic binary translator|first1=Chaohao|last1=Xu|first2=Jianhui|last2=Li|first3=Tao|last3=Bao|first4=Yun|last4=Wang|first5=Bo|last5=Huang|title=Proceedings of the 3rd international conference on Virtual execution environments - VEE '07|date=13 June 2007|publisher=Association for Computing Machinery|pages=148–157|via=ACM Digital Library|doi=10.1145/1254810.1254831|isbn=9781595936301|s2cid=15234434|access-date=2021-10-27 |archive-date=2021-10-27 |archive-url=https://web.archive.org/web/20211027171912/https://dl.acm.org/doi/10.1145/1254810.1254831|url-status=live}}</ref>

* QuaC: Binary Optimization for Fast [[self-modifying code|Runtime Code Generation]] in [[C (programming language)|C]]<ref>{{Cite web |url=http://www.eecs.berkeley.edu/Pubs/TechRpts/1994/CSD-94-792.pdf |title=Archived copy |access-date=2010-01-07 |archive-date=2009-04-19 |archive-url=https://web.archive.org/web/20090419013547/http://www.eecs.berkeley.edu/Pubs/TechRpts/1994/CSD-94-792.pdf |url-status=live }}</ref> - (which appears to include some elements of JIT)

* [[DynamoRIO]]