exynos-5420

Le CPU Exynos 5 Octa saranno in grado di utilizzare tutti i loro 8 core entro fine anno

Nicola Ligas

Exynos 5 Octa è una CPU costruita con architettura big.LITTLE, affiancando a 4 core Cortex-A15 ad alte prestazioni, altri 4 core Cortex-A7 votati al risparmio energetico, in modo da impiegare l’una o l’altra soluzione a seconda delle esigenze del momento, ma senza mai consentire l’attivazione contemporanea di tutti gli otto core: per questo motivo il processore non può essere definito un vero octa-core, ma piuttosto un 4+4.

Questo limite sarà però presto abbattuto, e non solo per esigenze di pure prestazioni, ma anche per aumentarne l’efficienza: mentre i thread ad alta priorità potranno usare i Cortex-A15, quelli a più bassa priorità potranno contemporaneamente avvalersi dei quattro A7, senza dover passare avanti e indietro, come avviene adesso. Si tratta in pratica della stessa soluzione detta Heterogeneous Multi-Processing, annunciata da MediaTek già lo scorso luglio, e non è ancora ben chiaro se sarà abilitata anche negli attuali modelli con Exynos 5, o meno. Video e comunicato stampa dopo lo stacco.

Samsung Primes Exynos 5 Octa for ARM big.LITTLE Technology with Heterogeneous Multi-Processing Capability
Seoul, Korea, September 10, 2013
Samsung Electronics Co., Ltd., a world leader in advanced semiconductor solutions, today announced its Heterogeneous Multi-Processing (HMP) solution for the Exynos 5 Octa to fully maximize the benefits of the ARM® big.LITTLE™ technology. The HMP capability gives system-level designers the ability to develop solutions that deliver the right combination of high-performance and low-power to carry out tasks such as 3D gaming, complex augmented reality and advanced web browsing.

“It’s usually assumed that the big CPU will do all the performance-critical work, however, power-efficient little cores can handle many significant workloads all on their own, so the workload is balanced within the system,” said Taehoon Kim, vice president of System LSI marketing, Samsung Electronics. “big.LITTLE processing is designed to deliver the right combination of processors for a specific job. An eight-core processor with HMP is the truest form of the big.LITTLE technology with limitless benefits to the users of high-performance, low-power mobile products.”

“ARM big.LITTLE multi-processing technology delivers the highest performance and efficiency across the widest range of workloads,” said Noel Hurley, vice president, Strategy and Marketing, Processor Division, ARM. “We welcome Samsung’s continued commitment to deploying the leading-edge technology on their latest chips featuring the ARM Cortex™-A series of processors, ARM Mali™ GPUs and ARM Artisan™ physical IP.”

HMP is the most powerful use model for ARM big.LITTLE technology, as it enables the use of all physical cores at the same time. Software threads with high priority or high computational intensity can be allocated to the ‘big’ Cortex-A15 cores while threads with less priority or are less computationally intensive, can be performed by the ‘LITTLE’ Cortex-A7 cores, enabling a highly responsive, low-energy system to be built.

Software implementation is essential to maximizing the benefits of big.LITTLE technology. Multi-processing software controls the scheduling of threads of execution to the appropriate core. In earlier versions of the big.LITTLE software, the whole processor context is moved up to the ‘big’ core or down to the ‘LITTLE’ core based on the measured work load. In-depth study and analysis of diverse use case scenarios enable Samsung to achieve efficiency and high-performance, while managing power levels to deliver optimal user environments.

The HMP solution for Samsung’s Exynos 5 Octa application processors will be available to customers in 4Q of 2013.

Via: Engadget
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