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TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20290311T030000 RDATE:20291104T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20300310T030000 RDATE:20301103T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20310309T030000 RDATE:20311102T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20320314T030000 RDATE:20321107T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20330313T030000 RDATE:20331106T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT BEGIN:DAYLIGHT DTSTART:20340312T030000 RDATE:20341105T010000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:America/New_York EDT END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:65770fec5b2e2529f066907ac79dc232 CATEGORIES:Faculty Candidate Talk CREATED:20190823T084023 SUMMARY:Rethinking the Hardware-Software contract: Enabling practical and general cross-layer optimizations LOCATION:CoRE A 301 DESCRIPTION;ENCODING=QUOTED-PRINTABLE:
Abstract :
Layere d abstractions in the computing stack are critical to building complex syst ems, but the existing *interfaces* between layers restrict what can be done at each level. Enhancing cross-layer interfaces--specifically, the hardwar e-software interface--is crucial towards addressing two important and hard- to-solve challenges in computer systems today: First, significant effort an d expertise are required to write high-performance code that harnesses the full potential of today’s diverse and sophisticated hardware. Second, as a hardware or system designer, architecting faster and more efficient systems is challenging as the vast majority of the program’s semantic content and programmer intent gets lost in translation with today’s hardware-software i nterface. Moving towards the future, these challenges in programmability an d efficiency will be even more intractable as we architect increasingly het erogeneous and sophisticated systems.
In this talk, I will highlight my work [ISCA‘15, MI CRO‘16, ISCA‘18, ISCA‘18] on how to design rich cross-layer abstractions th at provide layered interfaces to directly communicate higher-level program semantics and intent from the application to the lower levels of the stack. In doing so, we can effectively bridge the so-called “semantic gap” betwee n applications and computer systems, and enable a wide range of cross-layer optimizations in future systems with a single unifying interface. I will d iscuss how cross-layer approaches with these abstractions can significantly enhance (1) performance and efficiency by enabling the system to adapt to application characteristics and (2) programmability and portability by enab ling application software to easily leverage diverse underlying hardware re sources without specific knowledge of system details. For example, daunting aspects of programming GPUs can be made much simpler with a rich cross-lay er programming abstraction. I will describe how such abstractions can be de signed to be highly practical and low-overhead, requiring only small additi ons to existing abstractions.
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