BEGIN:VCALENDAR METHOD:REQUEST PRODID:Microsoft Exchange Server 2010 VERSION:2.0 BEGIN:VTIMEZONE TZID:Eastern Standard Time BEGIN:STANDARD DTSTART:16010101T020000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010101T020000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ORGANIZER;CN=Michael McDonald:mailto:michael.mcdonald@fsu.edu DESCRIPTION;LANGUAGE=en-US:"Multi-Agent Reinforcement Learning-Based Routin g for Dragonfly Networks"\n\nXin Yuan\nDepartment of Computer Science\nFlo rida State University (FSU)\n\nPlease feel free to forward/share this invi tation with other groups/disciplines that might be interested in this talk /topic. All are welcome to attend.\n\nNOTE: In-person attendance is reques ted in our 499 Dirac Science Library (DSL) Seminar Room. Zoom access is in tended for external (non-departmental) participants only.\n\nhttps://fsu.z oom.us/j/94273595552\nMeeting # 942 7359 5552\n\nšŸŽ¦ Colloquium recording s will be made available here\, https://www.sc.fsu.edu/colloquium\n\n\nWedn esday\, Mar 25\, 2026\, Schedule:\n\n* 3:00 to 3:30 PM Eastern Time (US an d Canada)\nā˜• Nespresso & Teatime - 417 DSL Commons\n\n* 3:30 to 4:30 PM Eastern Time (US and Canada)\nšŸ•Ÿ Colloquium - 499 DSL Seminar Room\n\n\n Abstract:\nReinforcement Learning (MARL)-based routing has emerged as a pr omising approach for high-performance interconnect networks such as Dragon fly\, offering a viable alternative to the widely used Universal Globally Adaptive Load-balanced (UGAL) routing. Practical routing on modern interco nnects must satisfy various requirements\, such as being deadlock-free and having a limited path length. These requirements impose routing constrain ts\, which in turn pose challenges for MARL-based routing. In particular\, two important issues must be addressed for a MARL-based scheme to be effe ctive. First\, in the presence of routing constraints\, sufficient path di versity to accommodate different traffic conditions is essential. Second\, since routing constraints influence how Q-values are propagated in a MARL -based scheme\, it is vital that the value propagation mechanism accounts for the routing constraints. Existing MARL-based routing schemes for Drago nfly fall short in addressing both issues. As a result\, while they achiev e high performance for some traffic conditions\, they may exhibit poor per formance or even pathological behaviors in other scenarios. In this work\, we discuss the limitations of existing MARL-based routing schemes for Dra gonfly\, present methods to address the two key issues\, and develop UGAL- Q\, a novel MARL-based scheme that resolves these issues and overcomes the problems in existing approaches. We perform extensive evaluations using b oth synthetic traffic and HPC application benchmarks. The results demonstr ate that our scheme is more effective than existing ones and is a robust r outing solution for Dragonfly.\n\n\nAdditional colloquium details can be f ound here.\nhttps://www.sc.fsu.edu/news-and-events/colloquium/1914-colloqu ium-with-xin-yuan-2026-03-25\n\n UID:040000008200E00074C5B7101A82E00800000000DDC08899DDBBDC01000000000000000 0100000007D50B9AD52078F4B82219BB1D4B40833 SUMMARY;LANGUAGE=en-US:Scientific Computing Colloquium with Xin Yuan DTSTART;TZID=Eastern Standard Time:20260325T153000 DTEND;TZID=Eastern Standard Time:20260325T162500 CLASS:PUBLIC PRIORITY:5 DTSTAMP:20260324T222856Z TRANSP:OPAQUE STATUS:CONFIRMED SEQUENCE:0 LOCATION;LANGUAGE=en-US:https://fsu.zoom.us/j/94273595552 X-MICROSOFT-CDO-APPT-SEQUENCE:0 X-MICROSOFT-CDO-OWNERAPPTID:2124662237 X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-CDO-ALLDAYEVENT:FALSE X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INSTTYPE:0 X-MICROSOFT-DONOTFORWARDMEETING:FALSE X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MICROSOFT-REQUESTEDATTENDANCEMODE:DEFAULT X-MICROSOFT-ISRESPONSEREQUESTED:FALSE X-MICROSOFT-LOCATIONDISPLAYNAME:https://fsu.zoom.us/j/94273595552 X-MICROSOFT-LOCATIONSOURCE:None X-MICROSOFT-LOCATIONS:[{"DisplayName":"https://fsu.zoom.us/j/94273595552"\, "LocationAnnotation":""\,"LocationUri":""\,"LocationStreet":""\,"LocationC ity":""\,"LocationState":""\,"LocationCountry":""\,"LocationPostalCode":"" \,"LocationFullAddress":""}] BEGIN:VALARM DESCRIPTION:REMINDER TRIGGER;RELATED=START:-PT5M ACTION:DISPLAY END:VALARM END:VEVENT END:VCALENDAR