Feb 2016 – Jul 2019 · 3 yrs 5 mos · Vancouver, Canada Area

• Built a (log processing) pipeline for anomaly detection in logs employing machine learning. Designed a major part of the infrastructure including the pipeline backend, designed and implemented the feature extraction module/stage in the pipeline, mechanisms for debugging/analyzing the output/results of the anomaly detector, raw log/data analysis and runtime performance related work. Other work involved setting up and maintaining a SLURM cluster for running hyper-parameter tuning experiments and designing/implementing an extendable/automated attack system for automatic labeled data generation for the pipeline.

Dec 2014 – Apr 2015 · 4 mos · Bangalore, India

• I built a data ingest system from custom hardware sending UDP packets over multiple (8) 1 Gbps links into a server. The data was processed in-line and a portion of it saved into secondary storage. I also implemented simple data processing using the AVX2 instruction set.

Nov 2011 – Oct 2014 · 2 yrs 11 mos · Bangalore

• Design and development of software for sharing and aggregating the flash storage across servers
• using high speed interconnects - Infiniband and 10G Ethernet. The flash storage itself was PCI
• Express based with very low IO latency. The challenge was to retain the low latency provided by
• the base flash while adding layers of software onto it. Since the new layers introduced the network
• into the IO path, Infiniband (RDMA) was used to minimize the additional latencies.
• Also spent time on the caching solution (use of Flash Storage as a cache for disks) developing key
• data structures required for a write-back cache. One was adoption of the FreeBSD RB-Tree
• implementation into our code. The other was a partially sorted list that I implemented.
• Performance enhancements and bug fixes in other components of the stack – primarily the Flash
• Translation Layer (FTL).

Jan 2011 – Oct 2011 · 9 mos

• Responsible for overall performance and scalability of GlusterFS. Automated performance tests and
• developed a framework to help measure and analyze systemic parameters during load across the
• distributed setup.

Jan 2005 – Nov 2010 · 5 yrs 10 mos

• Worked on different technologies while at Sun:
• IPoIB administration remodeling
• Design and implementation of a new IPoIB administrative model. This project involved changes to
• the IPoIB driver, the Nexus driver, utilities and libraries. The change was to move away from nexus
• based instantiation to administrator driven instantiation.
• Solaris IPoIB Performance
• Improvement of "IP over Infiniband" performance on Solaris. This involved an overhaul of the
• existing solaris IPoIB driver to include features like Checksum Offload, Large Segmentation
• Offload (LSO/TSO) and a re-architecture of locking to improve scalability. The end result was a
• performance boost of 2-3 times the baseline, with greatly improved scalability.
• Extended partition Support for Solaris
• It initially started as a hobby project which later on gained acceptance into the mainstream Solaris code base. This project involved modifications to the following subsystems:
• Solaris kernel modules – Utilities – Libraries - Solaris boot utilities - Solaris Devfs
• Solaris Device Drivers Sustaining
• Bug fixes to Solaris device drivers in various areas - Ethernet, USB, SCSI
• During this period I developed insights into various subsystems of Solaris - understanding GRUB
• and kernel initialization, device enumeration, etc. This also provided me with an opportunity to
• learn extensive kernel crash dump analysis and usage of Dtrace.

Apr 2004 – Dec 2004 · 8 mos

• The project involved prototyping a PPP driver based on the Linux PPP driver to work on an RTAI
• (Real Time Application Interface) based phone. RTAI is a flavour of RT Linux.
• During this period I also did some work with a simulator to understand the Radio Resource Control
• layer of the UMTS protocol.

Sep 2003 – Mar 2004 · 6 mos

• Porting of a COBOL application running on a HP3000 mainframe to a HP9000 mainframe.

Jul 2002 – Aug 2003 · 1 yr 1 mo

• Device Driver work:
• Developed a Linux PCI device driver for a couple data acquisition card manufactured by AMCC,
• India and CDAC, India. Both drivers were for the 2.4 Linux Kernel.
• FFT implementation using the MMX instuctions set:
• Performance enhancement of FFTs (Fast Fourier Transforms) using the MMX instruction set. Used
• the FFTW (Fastest Fourier Transform in the West - www.fftw.org) to generate C code and hand
• converted it to assembly to get a speed up of 3.3 over FFTW.