About Me

Publications

Gadget: A New Benchmark Harness for Systematic and robust Evaluation of Streaming State Stores
E Asyabi, Y Wang, J Liagouris, V Kalavri, and A Bestavros. EuroSys '22: Proceedings of the Seventeenth European Conference on Computer Systems

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Peafowl: In-application CPU Scheduling to Reduce Power Consumption of In-memory Key-Value Stores
E Asyabi , A Bestavros, E Sharafzadeh,T Zhu- ACM Symposium on Cloud Computing 2020 (SoCC '20)

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CTS: An operating system cpu scheduler to mitigate tail latency for latency-sensitive multi-threaded applications
E Asyabi, E Sharafzadeh, SA SanaeeKohroudi, M Sharifi- Journal of Parallel and Distributed Computing (2019)

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Yawn: A CPU Idle-state Governor for Datacenter Applications
E Sharafzadeh, SAS Kohroudi, E Asyabi , M Sharifi Proceedings of the 10th ACM SIGOPS Asia-Pacific Workshop on Systems (2019)

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TerrierTail: mitigating tail latency of cloud virtual machines
E Asyabi , SA SanaeeKohroudi, M Sharifi, A Bestavros - IEEE Transactions on Parallel and Distributed Systems (2018)

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ppXen: A hypervisor CPU scheduler for mitigating performance variability in virtualized clouds
E Asyabi, M Sharifi, A Bestavros- Future Generation Computer Systems (2018)

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Kani : a QoS-aware hypervisor-level scheduler for cloud computing environments
E Asyabi , A Azhdari, M Dehsangi, MG Khan, M Sharifi, SV Azhari - Cluster Computing (2016)

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cCluster: a core clustering mechanism for workload-aware virtual machine scheduling
M Dehsangi, E Asyabi , M Sharifi, SV Azhari - 2015 3rd International Conference on Future Internet of Things and Cloud (2015)

Internships

Twitter - Summer 2021
I am designing and developing a KV store for timeline caching. The project goal is to increase memory efficiency and scalability while offering high read and write throughput. In addition, I am researching the use of persistent memory for timeline caching.

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Einblick- Summer 2020
Einblick is an MIT-based startup founded by Tim Kraska . Einblick allows data scientists to build accurate, high-performance models more quickly and make them available to decision-makers. In Einblick, I researched an OLAP architecture that tries to process data mainly in the cache (i.e., in-cache execution). Over my time in Einblick, I designed a new architecture based on the Arrow framework for in-cache execution of queries like hash aggregation and built it over the summer. Our experiments showed the new architecture was up to four times faster.

TALKS

Persistent KV stores tailored for stream processing systems
Singularity-Data - March 2022 link - Slides

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Fast, easy, and correct evaluation of state stores for stream processing systems
Google - November 2021 - Slides

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Toward workload-aware state management in stream processing systems
The EuroSys Doctoral Workshop (EuroDW 2022) - April 2021 - PDF -Video - Slides

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A Survey on in-memory key-value store designs for today’s data centers
Boston University - December 2021 -PDF - Slides

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Peafowl: in-application CPU scheduling to reduce power consumption of in-memory key-value stores
Virtual ACM Symposium on Cloud Computing 2020 (SoCC '20) - October 2020 - PDF - Slides - Video - Poster

RESEARCH PROJECTS

Stream Processing Systems

In this project, I aim to enhance Stream Processing Systems (SPSs) throughput by understanding SPS's state workloads and then designing KV stores tailored for SPSs. I have performed a thorough empirical characterization study on state workloads I gathered from instrumenting Flink and RocksDB. Our analysis highlights the main characteristics of state store workloads in SPSs. We then designed a benchmarking system that enables easy and systematic evaluation of streaming state stores. We presented the results of our research at Eurosys 2022 conference. This research paper first highlights the overlooked characteristics of state workloads in stream processing systems. It then presents Gadget, a benchmarking system we built for robust and systematic evaluation of state stores used for stream processing systems. Please see the Gadget paper for more details. My research now focuses on designing a persistent KV store for stream processing systems.

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in-Memory Key-Value Store and Caching Systems

In these projects, I am researching the throughput, scalability, and resource efficiency of in-memory KV stores (please see my short survey on in-memory KV stores presented at Boston University). I am now researching an in-memory KV store for timeline\timeseries caching to increase memory efficiency while offering high throughput. Before this project, I redesigned the Memcached KV store to mitigate its power consumption. My studies demonstrate that existing power-saving approaches are ineffective when it comes to short service time and the high arrival rate of in-memory KV stores. In this project, I have transferred the scheduler from the operating system to Memcached, where there is more domain-specific knowledge. Our evaluations show that our KV store (Peafowl) reduces power consumption while offering microsecond-level tail latency. We have presented this research at ACM Symposium on Cloud Computing 2021 (SOCC 21). Please see the Peafowl paper for more detail.

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Clouds and Operating Systems

I have designed and built multiple hypervisor schedulers based on Xen to improve virtualized clouds' latency performance (TerrierTail), predictability (ppXen), utilization (Akita), and QoS (Kani). I have also redesigned the Linux CFS scheduler and its menu governor to improve the latency (CTS) and power consumption (Yawn) of data centers running on Linux. Please see Terretail, ppXen, Akita, CTS, Yawn, and Kani papers for more details.

TEACHING

Teaching Fellow for Fundamentals of Computing Systems (CS350)
Boston University: Spring 2019, Fall 2019, Spring 2020, and Fall 2020

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Teaching Fellow for Advanced Software Systems (CS410)
Boston University: Fall 2017

MENTORING

Erfan Sharafzadeh , Master student
Erfan is now a CS PhD student at Johns Hopkins University

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Alireza Sanaee , Master student
Alireza is now a CS PhD student at Queen Mary University

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Amin Fallahi , Undergraduate student
Amin is now a CS PhD studnet at Syracuse University

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SKILLS

Pogramming Langauges:
C, C++, Python, Rust, Java, C#

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Data processing systems:
Apache Flink, Apache Arrow, Apache Kafka

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Machine learning tools:
Scikit Learn, PyTorch