Author

Spiros Galanopoulos

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Preprint Oct 2026

HULK: An Efficient Algorithm for Enabling Fast Bulk Bitwise Operations on Homomorphically Encrypted Data

A wide range of important cloud applications, e.g., database analytics, graph analytics, and genome analysis, spend a considerable amount of time performing bulk bitwise operations (e.g., AND, OR, XOR). These applications often operate on highly sensitive data, making data privacy a critical concern. Homomorphic encryp...

Mayank Kabra, Phillip Widdowson, Harshita Gupta et al. · 0 citations

Preprint Sep 2026

Argus: Agentic, Reference-Calibrated, Tree-Guided, System-Software-Level Bottleneck Localization

Operating system (OS) code can account for a substantial share of CPU execution time. First, as application logic is offloaded to heterogeneous accelerators (e.g., GPUs), the CPU increasingly acts as an orchestrator, spending cycles in driver calls, data movement, and synchronization rather than in application code. Se...

Vlad-Petru Nitu, Harsh Songara, Konstantinos Sgouras et al. · 0 citations

Jul 2026

Valinor: Architectural Support for Fast, Energy-Efficient and Programmable Physical Memory Allocation

Vinor is presented, a hardware-OS cooperative memory allocation substrate that combines software flexibility with hardware-class performance and full-system simulation further evaluates the programmable allocation engine and six allocation libraries, showing that Valinor provides hardware-class performance without sacr...

K. Kanellopoulos, Spiros Galanopoulos, Konstantinos Sgouras et al. · arXiv.org · 0 citations