Speaker
Mr
Philippe Canal
(FERMILAB)
Description
For the last several months the main focus of development
in the ROOT I/O package has been code consolidation and
performance improvements.
Access to remote files is affected both by bandwidth and
latency. We introduced a pre-fetch mechanism to minimize
the number of transactions between client and server and
hence reducing the effect of latency. We will review the
implementation and how well it works in different conditions
(gain of an order of magnitude for remote file access).
We will also review new utilities, including a faster
implementation of TTree cloning (gain of an order of magnitude),
a generic mechanism for object references, and a new entry list
mechanism tuned both for small and large number of selections.
In addition to reducing the coupling with the core module and
becoming its owns library (libRIO) (as part of the general
restructuration of the ROOT libraries), the I/O package
has been enhanced in the area of XML and SQL support,
thread safety, schema evolution, TTreeFormula, and many other areas.
We will also discuss various ways, ROOT will be able to benefit
from multi-core architecture to improve I/O performances.
Authors
Ms
Anna Kreshuk
(CERN)
Mr
Leandro Franco
(CERN)
Mr
Paul Russo
(FERMILAB)
Mr
Philippe Canal
(FERMILAB)
