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Babak Falsafi

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Publications associées (89)

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

Quantifying the Mismatch between Emerging Scale-Out Applications and Modern Processors

Mohammad Alisafaee, Anastasia Ailamaki, Babak Falsafi, Michael Ferdman, Stavros Volos, Adrian Daniel Popescu, Al Mutaz Adileh, Dorde Jevdic, Ilknur Cansu Kaynak, Yusuf Onur Koçberber

Emerging scale-out workloads require extensive amounts of computational resources. However, data centers using modern server hardware face physical constraints in space and power, limiting further expansion and calling for improvements in the computational ...

Association for Computing Machinery2012

Toward Dark Silicon in Servers

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

Server chips will not scale beyond a few tens to low hundreds of cores, and an increasing fraction of the chip in future technologies will be dark silicon that we cannot afford to power. Specialized multicore processors, however, can leverage the underutil ...

Institute of Electrical and Electronics Engineers2011

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

Proactive Instruction Fetch

Babak Falsafi, Michael Ferdman, Ilknur Cansu Kaynak

2011

Making Address-Correlated Prefetching Practical

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

Despite a decade of research demonstrating its efficacy, address-correlated prefetching has never been implemented in a shipping processor because it requires megabytes of metadata—too large to store practically on chip. New storage-, latency-, and bandwid ...

2010

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

Near-Optimal Cache Block Placement with Reactive Nonuniform Cache Architectures

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

The growing core counts and caches of modern processors result in data access latency becoming a function of the data's physical location in the cache. Thus, the placement of cache blocks determines the cache's performance. Reactive nonuniform cache archit ...

2010

Shore-MT: A Scalable Storage Manager for the Multicore Era

Anastasia Ailamaki, Babak Falsafi, Frederick Ryan Johnson, Ippokratis Pandis

Database storage managers have long been able to efficiently handle multiple concurrent requests. Until recently, however, a computer contained only a few single-core CPUs, and therefore only a few transactions could simultaneously access the storage manag ...

ACM2009

Spatio-Temporal Memory Streaming

Anastasia Ailamaki, Babak Falsafi

Recent research advocates memory streaming techniques to alleviate the performance bottleneck caused by the high latencies of off-chip memory accesses. Temporal memory streaming replays previously observed miss sequences to eliminate long chains of depende ...

2009

Reactive NUCA: Near-Optimal Block Placement and Replication in Distributed Caches

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

Increases in on-chip communication delay and the large working sets of server and scientific workloads complicate the design of the on-chip last- level cache for multicore processors. The large working sets favor a shared cache design that maximizes the ag ...

2009

Practical Off-chip Meta-data for Temporal Memory Streaming

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

Prior research demonstrates that temporal memory streaming and related address-correlating prefetchers improve performance of commercial server workloads though increased memory level parallelism. Unfortunately, these prefetchers require large on-chip meta ...

2009

ProtoFlex: Towards Scalable, Full-System Multiprocessor Simulations Using FPGAs

Babak Falsafi

Functional full-system simulators are powerful and versatile research tools for accelerating architectural exploration and advanced software development. Their main shortcoming is limited throughput when simulating large multiprocessor systems with hundred ...

2009

Chip-Level Redundancy in Distributed Shared-Memory Multiprocessors

Babak Falsafi

Distributed shared-memory (DSM) multi- processors provide a scalable hardware platform, but lack the necessary redundancy for mainframe-level reliability and availability. Chip-level redundancy in a DSM server faces a key challenge: the increased latency t ...

2009

Flexible Hardware Acceleration for Instruction-Grain Lifeguards

Babak Falsafi, Evangelos Vlachos

Instruction-grain lifeguards monitor executing programs at the granularity of individual instructions to quickly detect bugs and security attacks, but their fine-grain nature incurs high monitoring overheads. This article identifies three common sources of ...

2009

Temporal instruction fetch streaming

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

L1 instruction-cache misses pose a critical performance bottleneck in commercial server workloads. Cache access latency constraints preclude L1 instruction caches large enough to capture the application, library, and OS instruction working sets of these wo ...

2008

Predictor virtualization

Babak Falsafi

Many hardware optimizations rely on collecting information about program behavior at runtime. This information is stored in lookup tables. To be accurate and effective, these optimizations usually require large dedicated on-chip tables. Although technology ...

2008

Flexible hardware acceleration for instruction-grain program monitoring

Babak Falsafi, Evangelos Vlachos

Instruction-grain program monitoring tools, which check and analyze executing programs at the granularity of individual instructions, are invaluable for quickly detecting bugs and security attacks and then limiting their damage (via containment and/or reco ...

2008

Temporal streams in commercial server applications

Anastasia Ailamaki, Babak Falsafi, Michael Ferdman

Commercial server applications remain memory bound on modern multiprocessor systems because of their large data footprints, frequent sharing, complex non-strided access patterns, and long chains of dependant misses. To improve memory system performance des ...

2008

Workshop on Transactional Computing (TRANSACT 2008) - Introduction

Pascal Felber, Babak Falsafi

2008

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