Du är här

Comparative Assessment and Evaluation of Jitter Control Methods

Författare:
Publiceringsår: 2007
Språk: Engelska
Dokumenttyp: Konferensbidrag

Sammanfattning

Most control systems involve the execution of periodic activities,
which are automatically activated by the operating system at the
specified rates. When the application consists of many concurrent
tasks, each control activity may experience delay and jitter,
which depend on several factors, including the scheduling
algorithm running in the kernel, the overall workload, the task
parameters, and the task interactions. If not properly taken into
account, delays and jitter may degrade the performance of the
system and even jeopardize its stability.


In this paper, we evaluate three methodologies for reducing the jitter
in control tasks: the first one consists of forcing the execution of
inputs and outputs at the period boundaries, so trading jitter with
delay; the second method reduces jitter and delay by assigning tasks
shorter deadlines; whereas, the third method relies on non preemptive
execution. We compare these techniques by illustrating examples,
pointing out advantages and disadvantages, and evaluating their
effects in control applications by simulation. It is found that the
deadline advancement method gives the better control performance for
most configurations.

Disputation

Nyckelord

  • Technology and Engineering

Övriga

15th International Conference on Real-Time and Network Systems
Nancy, France
Published
Yes

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

 

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen