SDI/LCS Seminar on Thursday, 12/7
Melissa
TITLE: Storage Management for Web Proxies
SPEAKER: Liddy Shriver of Bell Labs in Murray Hill, NJ
ABSTRACT:
Today, caching web proxies use general purpose file systems to store web
objects. Proxies, e.g., Squid or Apache, when running on a UNIX system,
typically use the standard UNIX file system (UFS) for this purpose. UFS
was designed for research and engineering environments, which have
different characteristics from that of a caching web proxy. Some of the
differences are high temporal locality, relaxed persistence and a
different read/write ratio. In this paper, we characterize the web proxy
workload, describe the design of Hummingbird, a light-weight file system
for web proxies, and present performance measurements of Hummingbird.
Hummingbird has two distinguishing features: it separates object naming
and locality through direct application-provided hints, and its clients
are compiled with a linked library interface for memory sharing. When we
simulated a proxy, Hummingbird achieves document request throughput 5-13
times larger than with several different versions of UFS. Our simulation
results are verified within the Polygraph proxy benchmarking
environment.
BIO:
Liddy Shriver graduated from NYU with a Ph.D. in Computer Science in
1997. After a brief postdoc at HP Labs in Palo Alto, CA, she has been
working at Bell Labs in Murray Hill, NJ. Her areas of research are disk
performance, file systems, and web searching.