In one embodiment, a continuation packet is referenced directly by a first task. The blocks have the same dependence pattern, but at a block scale. Scalable high performance main memory system using phasechange memory technology, isca 2009. Cacheconscious wavefront scheduling ieee conference. Mitigating gpu memory divergence for dataintensive. Divergenceaware warp scheduling ieee conference publication. Improving gpgpu resource utilization through alternative thread block scheduling. Our engineers customize their own metrics to fully monitor their systems health and performance. In proceedings of the international conference for high performance computing, networking, storage and analysis, page article 8, 2015. Divergenceaware warp scheduling ubc ece university of. Daws attempts to shift the burden of locality management from software to. Wavefront s powerful query language allows us to easily visualize and debug our time series telemetry data. Hence scheduling overheads can be amortized over blocks. The primary contribution of this work is a cacheconscious wavefront scheduling ccws system that uses locality information from the memory system to shape future memory accesses through hardware thread scheduling.
Send aws ecs data to wavefront using cadvisor or aws fargate. It proposes a novel cache conscious wavefront scheduling. Improving gpgpu resource utilization through alternative thread block scheduling minseok lee, seokwoo song, joosik moon, john kim. Unlike prior work on cacheconscious wavefront scheduling, which makes reactive scheduling decisions based on detected cache thrashing, daws makes proactive scheduling decisions based on cache usage predictions. Design and implementation of a hardware platform and software design and implementation at the operating system and. We propose cacheconscious wave front scheduling ccws, an adaptive hardware mechanism that makes use of a novel intrawavefront locality detector to capture lo. Tlbs per shader core, with and without cacheconscious wavefront scheduling, with and without thread block compaction. First, we are building a worldclass team to execute on this vision. Cacheconscious wavefront scheduling proceedings of the. The hardware groups these threads into warpswavefronts and executes them in lockstepdubbed singleinstruction, multiplethread simt by nvidia. It proposes a novel cacheconscious wavefront scheduling ccws mechanism which can be implemented with no changes to the cache replacement policy. Wavefront careers are defined by these valuestheyre ingrained into the way we work. Cacheconscious wavefront scheduling csa iisc bangalore.
The cooperativethreadarray cta schedulers employed by the current gpgpus greedily issue ctas to gpu cores as soon as the resources become available for higher thread level parallelism. Curriculum vitae purdue engineering purdue university. Thus, benefits of gpus high computing ability are reduced dramatically by the poor cache management and warp scheduling methods, which limit the system performance and energy efficiency. At the same time, current gpus fail to handle burstmode longaccess latency due to gpus poor warp scheduling method. Due to the locality consideration in the memory controller, the cta execution time varies in different cores, and thus it.
Warp limiting swl, cache conscious wavefront scheduling ccws, and memory aware iii. Tor aamodt electrical and computer engineering ubc. This paper studies the effects of hardware thread scheduling on cache management in gpus. A 512 mb twochannel mobile dram onedram with shared memory array, jssc 2008.
We propose cacheconscious wave front scheduling ccws, an adaptive hardware mechanism that makes use of a novel intrawave front locality detector to capture locality that is lost by other schedulers due to excessive contention for cache. Like traditional attempts to optimize cache replacement and insertion policies, ccws attempts to predict when cache lines will be. Timothy rogers curriculum vitae purdue engineering. Daws uses these predictions to schedule warps such that data reused by active scalar threads is unlikely to exceed the capacity of the l1 data cache.
Thread block compaction for efficient simt control flow. Rodriguesy, jie lvy, zhiying wangz and wenmei hwuy state key laboratory of high performance computing, national university of defense technology, changsha, china. Cacheconscious wavefront scheduling, vancouver, bc. Scheduling each fij element calculation separately is prohibitively expensive. It proposes a novel cacheconscious wavefront scheduling. Tim rogers divergenceaware warp scheduling 12 online characterization to create cache footprint prediction 1.
Wavefront scheduler cacheconscious wavefront scheduling timothy g. We propose cacheconscious wave front scheduling ccws, an adaptive hardware mechanism that makes use of a novel intrawave front locality detector to capture locality that is lost by other schedulers due to excessive contention for cache capacity. Hardware architectures and software systems that enable. Locality and scheduling in the massively multithreaded era. Ppt cacheconscious wavefront scheduling powerpoint. They propose cacheconscious wavefront scheduling ccws, an adaptive hardware mechanism that makes use of a novel intra wavefront locality detector to capture locality that is lost by other. Cacheconscious wavefront scheduling proceedings of the 2012. Our ability to deliver such game changing software to our customers is a result of several core cultural values that we hold dear. Eng, mcgill university, 2005 a thesis submitted in partial fulfillment of the requirements for the degree of doctor of philosophy in the faculty of graduate and postdoctoral studies electrical and computer engineering the university of british columbia. Timothy rogers curriculum vitae research interests hardware architectures and software systems that enable programmer productivity in a performant and energy efficient manner. When the first task completes, the first task enqueues a.
Cacheconscious wavefront scheduling ccws dynamically determine the number of wavefronts allowed to access the memory system and which wavefronts those should be. The gpu cache is inefficient due to a mismatch between the throughputoriented execution. Barrieraware warp scheduling for throughput processors. A software hardware comanaged cache architecture for reducing. Unlike prior work on cacheconscious wavefront scheduling, which makes. Tor aamodt is a professor in the department of electrical and computer engineering at the university of british columbia where he has been a faculty member since 2006. They propose cacheconscious wavefront scheduling ccws, an adaptive hardware mechanism that makes use of a novel intrawavefront locality detector to capture locality that is lost by other. Systems, apparatuses, and methods for implementing continuation analysis tasks cats are disclosed.
Aamodt1 1the university of british columbia 2amd research 36. Continuation analysis tasks for gpu task scheduling. This article studies a set of economically important server applications and presents the cacheconscious wavefront scheduling ccws hardware mechanism, which uses feedback from the memory system to guide the issuelevel thread scheduler and shape the access pattern seen by. Architectural support for address translation on gpus.
Ccws uses a novel lost intra wavefront locality detector lld to update an adaptive locality scoring system and improves the performance of hcs workloads by 63% over existing wavefront schedulers. While current gpus employ a perwarp or per wavefront stack to manage divergent control flow, it incurs decreased efficiency for applications with nested, datadependent control flow. We propose cacheconscious wavefront scheduling ccws, an adaptive hardware mechanism that makes use of a novel intrawavefront locality detector to capture locality that is lost by other schedulers due to excessive contention for cache capacity. Architectural support for virtual memory in gpus by bharath subramanian pichai a thesis submitted to the graduate schoolnew brunswick rutgers, the state university of new jersey. A good solution is to aggregate the elements into contiguous blocks, and process the contents of a block serially. In one embodiment, a system implements hardware acceleration of cats to manage the dependencies and scheduling of an application composed of multiple tasks. Locality and scheduling in the massively multithreaded era by timothy glenn rogers b. We propose cacheconscious wave front scheduling ccws, an adaptive. Improving gpgpu performance via cache locality aware. We propose cacheconscious wavefront scheduling ccws, an adaptive hardware mechanism that makes use of a novel intra wavefront locality detector to capture locality that is lost by other. Maximizing memorylevel parallelism for gpus with coordinated warp and fetch scheduling. Unlike prior work on cacheconscious wavefront scheduling, which makes re. Automatic cpugpu communication management and optimization, pldi 2011.
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