Ha dwa e suppo o sc a chpad memo y
ansac ions on GPU a chi ec u es
Alejand o Villegas1, Ra ael Asenjo1, Angeles Na a o1, Osca Pla a1,
Ra ael Ubal2, and Da id Kaeli2
1Depa men o Compu e A chi ec u e, Uni e si y o M´alaga, Andaluc´ıa Tech,
29071 M´alaga, Spain,
{a illegas, magonzalez, asenjo, opla a}@uma.es,
2Depa men o Elec ical and Compu e Enginee ing, No heas e n Uni e si y,
Bos on, MA, USA,
{ubal, kaeli}@ece.neu.edu,
Abs ac . G aphics P ocessing Uni s (GPUs) ha e become he accel-
e a o o choice o da a-pa allel applica ions, enabling he execu ion o
housands o h eads in a Single Ins uc ion - Mul iple Th ead (SIMT)
ashion. Using OpenCL e minology, GPUs o e a global memo y space
sha ed by all he h eads in he GPU, as well as a low-la ency local
memo y space sha ed by a subse o he h eads. The la e is used as a
sc a chpad o imp o e he pe o mance o he applica ions.
We p opose GPU-LocalTM, a ha dwa e ansac ional memo y (TM),
as an al e na i e o da a locking mechanisms in local memo y. GPU-
LocalTM alloca es ansac ional me ada a in he exis ing memo y e-
sou ces, minimizing he s o age equi emen s o TM suppo . In ad-
di ion, i ensu es o wa d p og ess h ough an au oma ic se ializa ion
mechanism. In ou expe imen s, GPU-LocalTM p o ides up o 100X
speedup o e se ialized execu ion.
Keywo ds: T ansac ional Memo y, Sc a chpad Memo y, GPGPU
Conclusions
In his pape we p esen GPU-LocalTM as a ha dwa e TM o GPU a chi ec-
u es ha ocuses on he use o local memo y. GPU-LocalTM is in ended o
limi he amoun o addi ional GPU ha dwa e needed o suppo TM. We p o-
pose wo al e na i e con lic de ec ion mechanisms a ge ing di e en ypes o
applica ions. Con lic de ec ion is pe o med pe -bank, ensu ing scalabili y o he
solu ion. We ind ha o some applica ions he use o TM is no op imal and
discuss how o imp o e ou implemen a ion o be e pe o mance. Fu he -
mo e, GPU-LocalTM in oduces a se ializa ion mechanism o ensu e o wa d
p og ess.
Acknowledgemen s
This wo k has been suppo ed by p ojec s TIN2013-42253-P and TIN2016-
80920-R, om he Spanish Go e nmen , P11-TIC8144 and P12- TIC1470, om
Jun a de Andaluc´ıa, and Uni e sidad de M´alaga, Campus de Excelencia In e -
nacional, Andaluc´ıa Tech.