Kaustubh Shivdikar

About Me

I am a Ph.D. candidate studying in NUCAR lab at Northeastern University under the guidance of Dr. David Kaeli. My research focuses on designing hardware accelerators for sparse graph workloads.

My expertise lies in:

• Computer Architecture Simulator Design
• Graph Neural Network Accelerators
• Sparse Matrix Accelerators
• Homomorphic Encryption Accelerators
• GPU Kernel Design

Contact: shivdikar.k [at] northeastern [dot] edu, mail [at] kaustubh [dot] us

Education

• Ph.D., Compuer Engineering, Northeastern University, Boston [Expected Fall 2022]
• M.S., Electrical and Computer Engineering, Northeastern University, Boston [May 2021]
• B.S., Electrical Engineering, Veermata Jijabai Technological Institute, University of Mumbai, India [May 2016]

Work

• Summer-Fall 2020 Coop: Parallel Computing Lab (Fabrizio Petrini), Intel, developed novel architectural features.
• Summer-Fall 2019 Coop: Parallel Computing Lab (Fabrizio Petrini), Intel, designed SpGEMM kernels for Intel’s new architecture.
• Summer-Fall 2018 Coop: Omron Adept (George Paul), implemented parallel graph traversal algorithms for Robot Path Planning.

Recent News

• May 2022: Served Submission co-chair for HPCA 2022 conference.
• April 2019: Graduate Innovator Award at the RISE 2019 Research Expo for our poster Pi-Tiles
• April 2018: Best Poster Award at the RISE 2018 Research Expo for our poster The Prime Hexagon
• November 2018: Mentored the NEU team for Student Cluster Contest at Super Computing Conference 2018
• November 2017: Joined the NEU Team for Student Cluster Contest at Super Computing Conference 2017

Publications

ResearchGate Google Scholar

• Accelerating Polynomial Multiplication for Homomorphic Encryption on GPUs (SEED 2022) [PDF]
  • Kaustubh Shivdikar, Gilbert Jonatan, Evelio Mora, Neal Livesay, Rashmi Agrawal, Ajay Joshi, José L. Abellán, John Kim, David Kaeli

Abstract

Abstract
Fully Homomorphic Encryption (FHE) enables users to securely outsource both the storage and computation of sensitive data to untrusted servers. Not only does FHE offer an attractive solution for security in cloud systems, but lattice-based FHE systems are also believed to be resistant to attacks by quantum computers. However, current FHE implementations suffer from prohibitively high latency. For lattice-based FHE to become viable for real-world systems, it is necessary for the key bottlenecks---particularly polynomial multiplication---to be highly efficient. In this paper, we present a characterization of GPU-based implementations of polynomial multiplication. We begin with a survey of modular reduction techniques and analyze several variants of the widely-used Barrett modular reduction algorithm. We then propose a modular reduction variant optimized for 64-bit integer words on the GPU, obtaining a 1.8x speedup over the existing comparable implementations. Next, we explore the following GPU-specific improvements for polynomial multiplication targeted at optimizing latency and throughput: 1) We present a 2D mixed-radix, multi-block implementation of NTT that results in a 1.85x average speedup over the previous state-of-the-art. 2) We explore shared memory optimizations aimed at reducing redundant memory accesses, further improving speedups by 1.2x. 3) Finally, we fuse the Hadamard product with neighboring stages of the NTT, reducing the twiddle factor memory footprint by 50%. By combining our NTT optimizations, we achieve an overall speedup of 123.13x and 2.37x over the previous state-of-the-art CPU and GPU implementations of NTT kernels, respectively.
FHE protects against network insecurities in untrusted cloud services, enabling users to securely offload sensitive data

• JAXED: Reverse Engineering DNN Architectures Leveraging JIT GEMM Libraries (SEED 2021) [PDF]
  • Malith Jayaweera, Kaustubh Shivdikar, Yanzhi Wang, David Kaeli

Abstract

Abstract
General matrix multiplication (GEMM) libraries on x86 architectures have recently adopted Just-in-time (JIT) based optimizations to dramatically reduce the execution time of small and medium-sized matrix multiplication. The exploitation of the latest CPU architectural extensions, such as the AVX2 and AVX-512 extensions, are the target for these optimizations. Although JIT compilers can provide impressive speedups to GEMM libraries, they expose a new attack surface through the built-in JIT code caches. These software-based caches allow an adversary to extract sensitive information through carefully designed timing attacks. The attack surface of such libraries has become more prominent due to their widespread integration into popular Machine Learning (ML) frameworks such as PyTorch and Tensorflow. In our paper, we present a novel attack strategy for JIT-compiled GEMM libraries called JAXED. We demonstrate how an adversary can exploit the GEMM library's vulnerable state management to extract confidential CNN model hyperparameters. We show that using JAXED, one can successfully extract the hyperparameters of models with fully-connected layers with an average accuracy of 92%. Further, we demonstrate our attack against the final fully connected layer of 10 popular DNN models. Finally, we perform an end-to-end attack on MobileNetV2, on both the convolution and FC layers, successfully extracting model hyperparameters.
Attack Surface: After the victim’s execution, the victim leaves behind information about its model hyperparameters in the JIT code cache. The attacker probes this JIT code cache through the attacker’s ML model and observes timing information to determine the victim’s model hyperparameters.

• GNNMark: A benchmark suite to characterize graph neural network training on GPUs (ISPASS 2021)
• SMASH: Sparse Matrix Atomic Scratchpad Hashing (MS Thesis, 2021)
• Student cluster competition 2018, team northeastern university: Reproducing performance of a multi-physics simulations of the Tsunamigenic 2004 Sumatra Megathrust earthquake on the AMD EPYC 7551 architecture (SC 2018)
• Speeding up DNNs using HPL based Fine-grained Tiling for Distributed Multi-GPU Training (BARC 2018)
• Video steganography using encrypted payload for satellite communication (Aerospace Conference 2017)
• Missing'Middle Scenarios' Uncovering Nuanced Conditions in Latin America's Housing Crisis (Cityscape 2017)
• Dynamic power allocation using Stackelberg game in a wireless sensor network (Aerospace Conference 2016)
• Automatic image annotation using a hybrid engine (Indicon 2015)

What is KTB Wiki?

This website was built on KTB Wiki. KTB wiki is my side project/attempt to consolidate knowledge gained during my Ph.D. journey. Though many other platforms provide similar service, the process of creating KTB Wiki was a learning experience since it taught me concepts indexing, load balancing, and in-memory file systems. KTB Wiki was built using MediaWiki and is intended for research purposes only.

KTB Wiki, because the best way to store your knowledge is in an indexed SQL database.

Interesting Reads

Coming soon...