Project System

Nitin Kunal

#***, *** *****, *** *****, Koramangala

Bangalore (Karnataka), India 560095

Cell: (91-934**-*****

Email: **********@*****.***

Objective

I want to work on cutting edge projects in the field of Computer Systems

(Software). In particular, I am highly interested in work that revolves

around system software (Operating System and

Compiler) for multicore architecture.

Qualification

Research and development experience of two years and ten

months.

Strong background of Operating Systems and Computer

Architecture.

B.Tech Information Technology from National Institute of

Technology Jaipur, CGPA 7.10/10.

Professional and Research Experience

Virident Systems India Ltd. (Subsidiary of Virident Systems, Inc. USA)

July 2007 - Present

Roles and responsibilities while working as Member of Technical

Staff (Software Development Team)

Studying, analysing and solving or assisting in

solving problems.

Designing, implementing and reviewing a proposed solution.

Project

File System for large NOR flash memory based storage device

The project was to design and develop a high performance, highly

parallel and scalable file system for a large NOR flash

memory based storage device (Spansion EcoRAM and Virident Green

Gateway). I have been working on this project in a group of three

since last two and half years. My contribution towards the project

includes (a) studying and analysing problems, (b) proposing and

implementing solutions and (c) unit testing and performance

measurement.

Project details

The proposed file system was designed keeping in mind following

properties of the storage device:-

i. The storage device is an array of NOR flash chips

(EcoRAM), coupled with a hardware controller (Green

Gateway). This brings features like parallel data transfer and

increased capacity (512Gbytes to 1Tbytes).

ii. Being a NOR flash based device, byte level access is

possible. Thus the device has very low read latency.

iii. Like any NOR flash memory writes suffer

from limitations like low bandwidth and erase-before-

write constraint.

iv. Life of device is limited by a maximum number of erases

per erase blocks. The erase blocks of the device can go bad

during run time (dynamic bad blocks).

The main features of the file system implemented so far are:-

i. Direct Memory Mapped Reads: File system is capable of

mapping the device directly to the address space of a process

for memory mapped reads.

ii. Parallel reads and writes: File system divides the device

into some logical units called Ranks. The files or directories

are then allocated space such that they span across these ranks.

And when an IO request comes from to the file system then they

are served in parallel using internal threads of the file

system.

iii. Logical to physical translation: File system maintains in-

memory data structures to do a logical to physical translation

of blocks of the device. The page-table style translation

table implementation insures low memory foot print and fast

lookup.

iv. Log based metadata: File system has logged based metadata

to ensure consistency in case of unclean shut down and to

improve performance of metadata updates.

v. Wear levelling: File system has a wear levelling module to

make sure that all erase blocks of the device are equally used

and have almost same erase count.

Academic Projects

Working on genetic algorithm performance improvement on

multicore systems (initial stage).

Built a toy OS based on assignments posted at CSE department

of University of Texas Austin.

Assisted Dr. Girdhari Singh, REC Jaipur, in academic research

(agent based UML).

Skills

Programming language C

Assembly language for x86 and ARM

Linux Kernel 2.6 internals (memory management, file systems,

process management)

Achievements

Rated as top performer for two consecutive years while

working at Virident Systems.

Scored 'A' grade in final year degree project at REC Jaipur

in 2007.

Secured state position 283 in the All India Engineering

Entrance Examination 2003.

Secured position 2,211 among 150,000 students in IIT JEE

2003.

References

Dr. Girdhari Singh

Associate Professor at National Institute of Technology Jaipur.

*************@****.**.**

I, hereby, submit that the information furnished above is true and that

suitable references can be furnished upon specific request to that effect.

Nitin Kunal

1st June, 2010

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