Thread Voting DVFS for Manycore NoCs

• We present a thread-voting DVFS technique for manycore networks-on-chip (NoCs). This technique has two remarkable features which differentiate from conventional NoC DVFS schemes. (1) Not only network-level but also thread-level runtime performance indicatives are used to guide DVFS decisions. (2) To resolve multiple perhaps conflicting performance indicatives from many cores, it allows each thread to 'vote' for a V/F level in its own performance interest, and a region-based V/F controller makes dynamic per-region V/F decision according to the major vote. We evaluate our technique on a 64-core CMP in full-system simulation environment GEM5 with both PARSEC and SPEC OMP2012 benchmarks. Compared to a network metric (router buffer occupancy) based approach, it can improve the network energy efficacy measured in MPPJ (million packets per joule) by up to 22 percent for PARSEC and 20 percent for SPEC OMP2012, and the system energy efficacy measured in MIPJ (million instructions per joule) by up to 35 percent for PARSEC and 33 percent for SPEC OMP2012. 

Ämnesord

NATURVETENSKAP  -- Data- och informationsvetenskap (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Chip manycore processor (CMP)

DVFS

network on chip (NoC)

power/energy efficiency

Electric load management

Measurement

Program compilers

Routers

System-on-chip

Voltage control

Instruction set

Load modeling

Many-core processors

Message systems

Power system management

Network-on-chip

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)