P44: Increasing Throughput of Multiprogram HPC Workloads:
Evaluating a SMT Co-Scheduling Approach
SessionPoster Reception
Event Type
ACM Student Research Competition
Poster
Reception
TimeTuesday, November 14th5:15pm -
7pm
LocationFour Seasons Ballroom
DescriptionSimultaneous Multithreading (SMT) is a technique that
allows for more efficient processor utilization by
scheduling multiple threads on a single physical core,
thus increasing the instruction level parallelism as it
mixes instructions from several threads. Previous
research has shown an average throughput increase of
around 20% with an SMT level of two, e.g. two threads
per core. However, a bad combination of threads can
actually result in decreased performance. To be
conservative, many HPC-systems have SMT disabled, thus,
limiting the number of scheduling slots in the system to
one per core. However, for SMT to not hurt performance,
we need to determine which threads should share a core.
In this poster, we use 30 random SPEC CPU job mixed on a
twelve-core Broadwell based node, to study the impact of
enabling SMT using two different co-scheduling
strategies. The results show that SMT can increase
performance especially when using no-same-program
co-scheduling.
