Publications de Willy Zwaenepoel

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We present Eagle, a new hybrid data center scheduler for data-parallel programs. Eagle dynamically divides the nodes of the data center in partitions for the execution of long and short jobs, thereby avoiding head-of-line blocking. Furthermore, it provides ...

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 ...

Causal consistency is an attractive consistency model for geo-replicated data stores. It is provably the strongest model that tolerates network partitions. It avoids the long latencies associated with strong consistency, and, especially when using read-onl ...

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 ...

We prove that no fully transactional system can provide fast read transactions (including read-only ones that are considered the most frequent in practice). Specifically, to achieve fast read transactions, the system has to give up support of transactions ...

This paper analyzes the impact on application performance of the design and implementation choices made in two widely used open-source schedulers: ULE, the default FreeBSD scheduler, and CFS, the default Linux scheduler. We compare ULE and CFS in otherwise ...

Operating systems have been shown to waste machine resources by leaving cores idle while work is ready to be scheduled. This results in suboptimal performance for user applications, and wasted power. Recent progress in formal verification methods have led ...

This paper introduces the concept of size-aware sharding to improve tail latencies for in-memory key-value stores, and describes its implementation in the Minos key-value store. ...

We present TRIAD, a new persistent key-value (KV) store based on Log-Structured Merge (LSM) trees. TRIAD improves LSM KV throughput by reducing the write amplification arising in the maintenance of the LSM tree structure. Although occurring in the backgrou ...

Distributed file systems often exhibit high tail latencies, especially in large-scale datacenters and in the presence of competing (and possibly higher priority) workloads. This paper introduces techniques for managing tail latencies in these systems, whil ...

Willy Zwaenepoel

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Job-aware Scheduling in Eagle: Divide and Stick to Your Probes

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

Causal Consistency and Latency Optimality: Friend or Foe?

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

Distributed Transactional Systems Cannot Be Fast

The Battle of the Schedulers: FreeBSD ULE vs. Linux CFS

Towards Proving Optimistic Multicore Schedulers

Size-aware Sharding For Improving Tail Latencies in In-memory Key-value Stores

TRIAD: creating synergies between memory, disk and log in log structured key-value stores

Managing Tail Latency in Datacenter-Scale File Systems Under Production Constraints

Closing The Performance Gap between Causal Consistency and Eventual Consistency

Profiling Software for Energy Consumption

Sahara: Guiding the Debugging of Failed Software Upgrades

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

Clock-RSM: Low-Latency Inter-Datacenter State Machine Replication Using Loosely Synchronized Physical Clocks