limit.scalability,USL-method | R Documentation |
Calculate the scalability limit for a specific model.
## S4 method for signature 'USL' limit.scalability(object, alpha, beta, gamma)
object |
A USL object. |
alpha |
Optional parameter to be used for evaluation instead of the parameter computed for the model. |
beta |
Optional parameter to be used for evaluation instead of the parameter computed for the model. |
gamma |
Optional parameter to be used for evaluation instead of the parameter computed for the model. |
The scalability limit is defined as:
Xroof = γ / α
This is the upper bound (Amdahl asymptote) of system capacity.
The parameters alpha
, beta
and gamma
are useful to do a
what-if analysis. Setting these parameters override the model parameters and
show how the system would behave with a different contention or coherency
delay parameter.
The scalability limit is undefined if alpha
is zero.
This function accepts an argument for beta
although the value is not
required to perform the calculation. This is on purpose to provide a
coherent interface.
A numeric value for the system capacity limit (e.g. throughput).
usl
,
peak.scalability,USL-method
optimal.scalability,USL-method
require(usl) data(specsdm91) limit.scalability(usl(throughput ~ load, specsdm91)) ## The throughput limit is about 3245
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