{"id":247898,"date":"2016-07-03T13:41:08","date_gmt":"2016-07-03T20:41:08","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&#038;p=247898"},"modified":"2019-09-06T19:12:07","modified_gmt":"2019-09-07T02:12:07","slug":"projector-agile-reconfigurable-data-center-interconnect-3","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/projector-agile-reconfigurable-data-center-interconnect-3\/","title":{"rendered":"ProjecToR: Agile Reconfigurable Data Center Interconnect"},"content":{"rendered":"<p>We explore a novel, free-space optics based approach for building data center interconnects. It uses a digital micromirror device (DMD) and mirror assembly combination as a transmitter and a photodetector on top of the rack as a receiver. Our approach enables all pairs of racks to establish direct links, and we can reconfigure such links (i.e., connect different rack pairs) within 12 us. To carry traffic from a source to a destination rack, transmitters and receivers in our interconnect can be dynamically linked in millions of ways. We develop topology construction and routing methods to exploit this flexibility, including a flow scheduling algorithm that is a constant factor approximation to the offline optimal solution. Experiments with a small prototype point to the feasibility of our approach. Simulations using realistic data center workloads show that, compared to the conventional folded-Clos interconnect, our approach can improve mean flow completion time by 30-95% and reduce cost by 25-40%.<\/p>\n<p>More details <a href=\"https:\/\/www.microsoft.com\/en-us\/research\/project\/projector-agile-reconfigurable-data-center-interconnect\/\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We explore a novel, free-space optics based approach for building data center interconnects. It uses a digital micromirror device (DMD) and mirror assembly combination as a transmitter and a photodetector on top of the rack as a receiver. Our approach enables all pairs of racks to establish direct links, and we can reconfigure such links [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","footnotes":""},"msr-content-type":[3],"msr-research-highlight":[],"research-area":[13547],"msr-publication-type":[193716],"msr-product-type":[],"msr-focus-area":[],"msr-platform":[],"msr-download-source":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-247898","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-systems-and-networking","msr-locale-en_us"],"msr_publishername":"","msr_edition":"","msr_affiliation":"","msr_published_date":"2016-8-22","msr_host":"","msr_duration":"","msr_version":"","msr_speaker":"","msr_other_contributors":"","msr_booktitle":"","msr_pages_string":"","msr_chapter":"","msr_isbn":"","msr_journal":"","msr_volume":"","msr_number":"","msr_editors":"","msr_series":"","msr_issue":"","msr_organization":"","msr_how_published":"","msr_notes":"","msr_highlight_text":"","msr_release_tracker_id":"","msr_original_fields_of_study":"","msr_download_urls":"","msr_external_url":"","msr_secondary_video_url":"","msr_longbiography":"","msr_microsoftintellectualproperty":1,"msr_main_download":"247901","msr_publicationurl":"http:\/\/dl.acm.org\/citation.cfm?id=2934911","msr_doi":"","msr_publication_uploader":[{"type":"file","viewUrl":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2016\/07\/projector_camera_ready-1.pdf","id":"247901","title":"projector_camera_ready","label_id":"243109","label":0},{"type":"url","viewUrl":"false","id":"false","title":"http:\/\/dl.acm.org\/citation.cfm?id=2934911","label_id":"243109","label":0},{"type":"doi","viewUrl":"false","id":"false","title":"10.1145\/2934872.2934911","label_id":"243109","label":0}],"msr_related_uploader":"","msr_attachments":[{"id":0,"url":"http:\/\/dl.acm.org\/citation.cfm?id=2934911"}],"msr-author-ordering":[{"type":"user_nicename","value":"Manya Ghobadi","user_id":32890,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Manya Ghobadi"},{"type":"user_nicename","value":"Ratul Mahajan","user_id":33351,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Ratul Mahajan"},{"type":"user_nicename","value":"Amar Phanishayee","user_id":30975,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Amar Phanishayee"},{"type":"user_nicename","value":"Nikhil Devanur","user_id":33100,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Nikhil Devanur"},{"type":"user_nicename","value":"Jana Kulkarni","user_id":32147,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Jana Kulkarni"},{"type":"user_nicename","value":"Gireeja Ranade","user_id":31880,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=Gireeja Ranade"},{"type":"text","value":"Pierre-Alexandre Blanche","user_id":0,"rest_url":false},{"type":"text","value":"Houman Rastegarfar","user_id":0,"rest_url":false},{"type":"text","value":"Madeleine Glick","user_id":0,"rest_url":false},{"type":"text","value":"Daniel Kilper","user_id":0,"rest_url":false}],"msr_impact_theme":[],"msr_research_lab":[],"msr_event":[],"msr_group":[144899,144927],"msr_project":[242636,298370],"publication":[],"video":[],"download":[],"msr_publication_type":"inproceedings","related_content":{"projects":[{"ID":242636,"post_title":"ProjecToR: Agile Reconfigurable Data Center Interconnect","post_name":"projector-agile-reconfigurable-data-center-interconnect","post_type":"msr-project","post_date":"2016-07-02 20:07:49","post_modified":"2020-03-13 16:48:24","post_status":"publish","permalink":"https:\/\/www.microsoft.com\/en-us\/research\/project\/projector-agile-reconfigurable-data-center-interconnect\/","post_excerpt":"ProjecToR is a novel, free-space optics based approach for building data center interconnects. 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