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Willy Zwaenepoel

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Publications associées (57)

Predicting Replicated Database Scalability from Standalone Database Profiling

Willy Zwaenepoel, Sameh Mohamed Elnikety, Emmanuel Cecchet

This paper develops analytical models to predict the throughput and the response time of a replicated database using measurements of the workload on a standalone database. These models allow workload scalability to be estimated before the replicated system ...

2009

Dynamic Content Web Applications: Crash, Failover, and Recovery Analysis

Willy Zwaenepoel

This work assesses how crashes and recoveries affect the performance of a replicated dynamic content web application. RobustStore is the result of retrofitting TPC-W’s online bookstore with Treplica, a middleware for building dependable applications. Imple ...

2009

Optimizing TCP Receive Performance

Aravind Menon, Willy Zwaenepoel

The performance of the networking stack in an operating system depends on the overhead incurred by two of its components: the per-byte overhead incurred in data-touching operations, and the per-packet overhead of protocol processing and other operating sys ...

2008

Staged Deployment in Mirage, an Integrated Software Upgrade Testing and Distribution System

Olivier Crameri, Willy Zwaenepoel, Ricardo Bianchini, Dejan Kostic, Nikola Knezevic

2007

Tashkent+: Memory-Aware Load Balancing and Update Filtering in Replicated Databases

Willy Zwaenepoel, Sameh Mohamed Elnikety

BEST PAPER AWARDWe present a memory-aware load balancing (MALB) technique to dispatch transactions to replicas in a replicated database. Our MALB algorithm exploits knowledge of the working sets of transactions to ...

2007

Concurrent Direct Network Access for Virtual Machine Monitors

Aravind Menon, Willy Zwaenepoel

This paper presents hardware and software mechanisms to enable concurrent direct network access (CDNA) by operating systems running within a virtual machine monitor. In a conventional virtual machine monitor, each operating system running within a virtual ...

2007

Whodunit: Transactional Profiling for Multi-Tier Applications

Willy Zwaenepoel

This paper is concerned with performance debugging of multi- tier applications, such as commonly found in servers and dynamic-content web sites. Existing tools and techniques for profiling such applications are not general enough to track and profile trans ...

2007

Caching Dynamic Web Content: Designing and Analysing an Aspect-Oriented Solution

Willy Zwaenepoel, Sumit Mittal

Caching dynamic web content is an effective approach to reduce Internet latency and server load. An ideal caching solution is one that can be added transparently by the developers and provides complete consistency of the cached documents, while minimizing ...

2006

Optimizing Network Virtualization in Xen

Aravind Menon, Willy Zwaenepoel

BEST PAPER AWARDIn this paper, we propose and evaluate three techniques for optimizing network performance in the Xen virtualized environment. Our techniques retain the basic Xen architecture of locating device dri ...

2006

Queryll: Java Database Queries through Bytecode Rewriting

Willy Zwaenepoel, Christopher Ming-Yee Iu

When interfacing Java with other systems such as databases, programmers must often program in special interface languages like SQL. Code written in these languages often needs to be embedded in strings where they cannot be error-checked at compile-time, or ...

2006

A comparative evaluation of transparent scaling techniques for dynamic content web servers

Willy Zwaenepoel

We study several transparent techniques for scaling dynamic content web sites, and we evaluate their relative impact when used in combination. Full transparency implies strong data consistency as perceived by the user, no modi- fications to existing dynami ...

2005

Iterative Adaptation for Mobile Clients Using Existing APIs

Willy Zwaenepoel

Iterative Adaptation is a novel approach to adaptation for resource-limited mobile and wireless environments that supports powerful application-specific adaptations without requiring modifications to the application's source code. Common productivity appli ...

2005

Diagnosing Performance Overheads in the Xen Virtual Machine Environment

Aravind Menon, Willy Zwaenepoel

Virtual Machine (VM) environments (e.g., VMware and Xen) are experiencing a resurgence of interest for diverse uses including server consolidation and shared hosting. An application's performance in a virtual machine environ- ment can differ markedly from ...

2005

A Portable Kernel Abstraction for Low-Overhead Ephemeral Mapping Management

Willy Zwaenepoel

Modern operating systems create ephemeral virtual-to-physical mappings for a variety of purposes, ranging from the implementation of interprocess communication to the implementation of process tracing and debugging. With succeeding generations of processor ...

2005

Denial-of-service resilience in peer-to-peer file sharing systems

Willy Zwaenepoel, Dan Mihai Dumitriu

Peer-to-peer (p2p) file sharing systems are characterized by highly replicated content distributed among nodes with enormous aggregate resources for storage and communication. These properties alone are not sufficient, however, to render p2p networks immun ...

2005

Database Replication Using Generalized Snapshot Isolation

Fernando Pedone, Willy Zwaenepoel, Sameh Mohamed Elnikety

Generalized snapshot isolation extends snapshot isolation as used in Oracle and other databases in a manner suitable for replicated databases. While (conventional) snapshot isolation requires that transactions observe the “latest” snapshot of the database, ...

2005

Causeway: Support for Controlling and Analyzing the Execution of Web-Accessible Applications

Willy Zwaenepoel

Causeway provides runtime support for the development of distributed meta-applications. These meta-applications control or analyze the behavior of multi-tier distributed applications such as multi-tier web sites or web services. Examples of meta-applicatio ...

2005

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