Database Reference
In-Depth Information
Data streams from
applications
Monitoring
Path
characteristics
Overlay
node
Output
Output
Routing and
scheduling
module
Path
characteristics
Monitoring
Overlay node
Overlay
node
Figure 5.4
Data movement services using IQ-Path.
IQ-Paths and PGOS provide the following services:
Probabilistic and “violation bound” guarantees.
Using the PGOS
algorithm, service guarantees can be provided using network behavior
prediction. PGOS can ensure that applications receive the bandwidths
they require with high levels of accuracy (e.g., an application receives
its required bandwidth 99% of the time), and that the occurrence of any
violations, such as missed packet deadlines, is bound (e.g., only 0.1% of
packets miss their deadline).
Reduced jitter.
Buffering requirements are minimized by reducing
jitter in time-sensitive applications.
Differentiated streaming services.
Higher priority streams receive
better service when network approaches maximum utilization.
Full bandwidth utilization.
Even with guarantees, the available and
utilized bandwidths are not sacrificed.
5.3 Autonomic Services for Wide-Area
and In-Transit Data
Complementary of the low-overhead asynchronous data extraction capabili-
ties provided by ADIOS and its underlying mechanisms (i.e., DataTap and
DART), wide-area streaming aims at eciently and robustly transporting the
