{"id":192746,"date":"2015-09-08T00:00:00","date_gmt":"2015-09-08T16:03:42","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/quantifiers-meet-their-matching-loop-new-techniques-and-tools-for-dealing-with-unpredictable-performance-in-dafny\/"},"modified":"2016-07-15T15:26:32","modified_gmt":"2016-07-15T22:26:32","slug":"quantifiers-meet-their-matching-loop-new-techniques-and-tools-for-dealing-with-unpredictable-performance-in-dafny","status":"publish","type":"msr-video","link":"https:\/\/www.microsoft.com\/en-us\/research\/video\/quantifiers-meet-their-matching-loop-new-techniques-and-tools-for-dealing-with-unpredictable-performance-in-dafny\/","title":{"rendered":"Quantifiers meet their match(ing loop): new techniques and tools for dealing with unpredictable performance in Dafny"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Large developments using the Dafny program verifier often suffer from the so-called butterfly effect, where minor modifications to the program source cause verification failures or large variations in verification times. This low predictability, made worse by the lack of high-level tools for debugging these issues, significantly degrades the experience of our users. This talk will describe my joint efforts with Rustan Leino to improve this development experience: I will discuss our Dafny-level implementation of trigger selection, trigger splitting, and matching-loop detection for user-written quantifiers, and demo new graphical performance debugging tools for z3. I will also briefly demo our new Emacs modes for Dafny and Boogie, and show how we connect IDEs with Dafny to encourage users to write z3-friendly quantifiers.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Large developments using the Dafny program verifier often suffer from the so-called butterfly effect, where minor modifications to the program source cause verification failures or large variations in verification times. This low predictability, made worse by the lack of high-level tools for debugging these issues, significantly degrades the experience of our users. This talk will [&hellip;]<\/p>\n","protected":false},"featured_media":199261,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr_hide_image_in_river":0,"footnotes":""},"research-area":[],"msr-video-type":[],"msr-locale":[268875],"msr-post-option":[],"msr-session-type":[],"msr-impact-theme":[],"msr-pillar":[],"msr-episode":[],"msr-research-theme":[],"class_list":["post-192746","msr-video","type-msr-video","status-publish","has-post-thumbnail","hentry","msr-locale-en_us"],"msr_download_urls":"","msr_external_url":"https:\/\/youtu.be\/vSYjJFMjTnM","msr_secondary_video_url":"","msr_video_file":"","_links":{"self":[{"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-video\/192746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-video"}],"about":[{"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/types\/msr-video"}],"version-history":[{"count":0,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-video\/192746\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/media\/199261"}],"wp:attachment":[{"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/media?parent=192746"}],"wp:term":[{"taxonomy":"msr-research-area","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/research-area?post=192746"},{"taxonomy":"msr-video-type","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-video-type?post=192746"},{"taxonomy":"msr-locale","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-locale?post=192746"},{"taxonomy":"msr-post-option","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-post-option?post=192746"},{"taxonomy":"msr-session-type","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-session-type?post=192746"},{"taxonomy":"msr-impact-theme","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-impact-theme?post=192746"},{"taxonomy":"msr-pillar","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-pillar?post=192746"},{"taxonomy":"msr-episode","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-episode?post=192746"},{"taxonomy":"msr-research-theme","embeddable":true,"href":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/wp\/v2\/msr-research-theme?post=192746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}