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The LHCb detector at the LHC
- A. A. Alves, L. M. A. Filho, T. Ypsilantis
- Physics
- 14 August 2008
The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected…
Aether: A Scalable Approach to Logging
- Ryan Johnson, I. Pandis, R. Stoica, Manos Athanassoulis, A. Ailamaki
- Computer ScienceProceedings of the VLDB Endowment
- 1 September 2010
This paper identifies four logging-related impediments to database system scalability and addresses them with techniques that, when combined, comprise a holistic, scalable approach to logging.
Improving Flash Write Performance by Using Update Frequency
- R. Stoica, A. Ailamaki
- Computer ScienceProceedings of the VLDB Endowment
- 1 July 2013
This paper proposes a new principled data placement algorithm that can be incorporated into existing FTLs that reduces write overhead by 20% - 75% when compared to state-of-art techniques.
Enabling efficient OS paging for main-memory OLTP databases
- R. Stoica, A. Ailamaki
- Computer ScienceInternational Workshop on Data Management on New…
- 24 June 2013
This paper proposes a simple and low-overhead technique that enables main-memory databases to efficiently migrate cold data to secondary storage by relying on the OS's virtual memory paging mechanism, and transparently re-organizes the in-memory data structures to reduce paging I/O and improve hit rates.
Identifying hot and cold data in main-memory databases
- Justin J. Levandoski, P. Larson, R. Stoica
- Computer ScienceIEEE International Conference on Data Engineering
- 8 April 2013
This work proposes to log record accesses - possibly only a sample to reduce overhead - and performs offline analysis to estimate record access frequencies and finds that exponential smoothing produces very accurate estimates, leading to higher hit rates than the best caching techniques.
Evaluating and repairing write performance on flash devices
- R. Stoica, Manos Athanassoulis, Ryan Johnson, A. Ailamaki
- Computer ScienceInternational Workshop on Data Management on New…
- 28 June 2009
This paper proposes new a flash aware data layout --- append and pack --- which stabilizes device performance by eliminating random writes and assesses the impact of append andpack on OLTP workload performance using both an analytical model and micro-benchmarks.
Designing Access Methods: The RUM Conjecture
- Manos Athanassoulis, Michael S. Kester, Mark D. Callaghan
- Computer ScienceInternational Conference on Extending Database…
- 2016
It is conjecture that when optimizing the read-update-memory overheads, optimizing in any two areas negatively impacts the third, and the RUM Conjecture is conjectured, which manifests in state of the art access methods, and is envisioned a trend toward RUMaware access methods for future data systems.
TPC-E vs. TPC-C: characterizing the new TPC-E benchmark via an I/O comparison study
- Shimin Chen, A. Ailamaki, R. Stoica
- Computer ScienceSGMD
- 8 February 2011
This paper compares T PC-E with the familiar TPCC benchmark in order to understand the behavior of the new TPC-E benchmark, and finds that Tpc-E is more read intensive with a 9.7:1 I/O read to write ratio, while TPC -C sees a 1.9:1 read-to-write ratio.
Decoupling contention management from scheduling
- Ryan Johnson, R. Stoica, A. Ailamaki, T. Mowry
- Computer ScienceASPLOS XV
- 13 March 2010
A load control mechanism which manages the number of active threads in the system separately from any contention which may exist is proposed, which results in stable, high performance for both lightly and heavily loaded systems, and can be implemented as a library which benefits existing code.
On The [Ir]relevance of Network Performance for Data Processing
- A. Trivedi, Patrick Stuedi, Nikolas Ioannou
- Computer ScienceUSENIX Workshop on Hot Topics in Cloud Computing
- 20 June 2016
This study looks into procedures and subsystems that are common in any of these frameworks such as networking IO, shuffle data management, object (de)serialization, copies, job scheduling and coordination, etc, and reveals three main findings.
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