Publications de Pejman Lotfi Kamran

Scale-Out Processors

Global-scale online services, such as Google’s Web search and Facebook’s social networking, run in large-scale datacenters. Due to their massive scale, these services are designed to scale out (or distribute) their respective loads and datasets across thou ...

EPFL2013

Optimizing Data-Center TCO with Scale-Out Processors

Babak Falsafi, Pejman Lotfi Kamran, Boris Robert Grot

Performance and total cost of ownership (TCO) are key optimization metrics in large-scale data centers. According to these metrics, data centers designed with conventional server processors are inefficient. Recently introduced processors based on low-power ...

Institute of Electrical and Electronics Engineers2012

NOC-Out: Microarchitecting a Scale-Out Processor

Babak Falsafi, Pejman Lotfi Kamran, Boris Robert Grot

Scale-out server workloads benefit from many-core processor organizations that enable high throughput thanks to abundant request-level parallelism. A key characteristic of these workloads is the large instruction footprint that exceeds the capacity of priv ...

2012

Scale-Out Processors

Babak Falsafi, Michael Ferdman, Pejman Lotfi Kamran, Stavros Volos, Al Mutaz Adileh, Dorde Jevdic, Yusuf Onur Koçberber, Javier Picorel Obando, Boris Robert Grot

Scale-out datacenters mandate high per-server throughput to get the maximum benefit from the large TCO investment. Emerging applications (e.g., data serving and web search) that run in these datacenters operate on vast datasets that are not accommodated by ...

Ieee2012

Thermal Characterization of Cloud Workloads on a Power-Efficient Server-on-Chip

Babak Falsafi, Pejman Lotfi Kamran, Dorde Jevdic, Andreas Panteli

We propose a power-efficient many-core server-on-chip system with 3D-stacked Wide I/O DRAM targeting cloud workloads in datacenters. The integration of 3D-stacked Wide I/O DRAM on top of a logic die increases available memory bandwidth by using dense and f ...

2012

Cuckoo Directory: A Scalable Directory for Many-Core Systems

Ken Balet, Babak Falsafi, Michael Ferdman, Pejman Lotfi Kamran

Growing core counts have highlighted the need for scalable on-chip coherence mechanisms. The increase in the number of on-chip cores exposes the energy and area costs of scaling the directories. Duplicate-tag based directories require highly associative st ...

IEEE Press2011

TurboTag: Lookup Filtering to Reduce Coherence Directory Power

Babak Falsafi, Michael Ferdman, Daniel Crisan, Pejman Lotfi Kamran

On-chip coherence directories of today’s multi-core systems are not energy efficient. Coherence directories dissipate a significant fraction of their power on unnecessary lookups when running commercial server and scientific workloads. These workloads have ...

ACM2010