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Added explanation for StarvationThreshold. Removed TotalPower as it was embedded inside the schedulers.

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Pradyumna Kaushik 2016-11-28 20:00:12 -05:00 • committed by Renan DelValle
parent 50d1d79051
commit 512918e1e8
1 changed files with 20 additions and 23 deletions
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43
constants/constants.go
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@ -26,7 +26,11 @@ func AddNewHost(newHost string) bool {
}
}
// Lower bound of the percentage of requested power, that can be allocated to a task.
/*
Lower bound of the percentage of requested power, that can be allocated to a task.
Note: This constant is not used for the proactive cluster wide capping schemes.
*/
var PowerThreshold = 0.6 // Right now saying that a task will never be given lesser than 60% of the power it requested.
/*
@ -47,29 +51,22 @@ func UpdateCapMargin(newCapMargin float64) bool {
}
}
// Threshold factor that would make (Cap_margin * task.Watts) equal to (60/100 * task.Watts).
var StarvationFactor = 0.8
/*
The factor, that when multiplied with (task.Watts * CapMargin) results in (task.Watts * PowerThreshold).
This is used to check whether available power, for a host in an offer, is not less than (PowerThreshold * task.Watts),
which is assumed to result in starvation of the task.
Here is an example,
Suppose a task requires 100W of power. Assuming CapMargin = 0.75 and PowerThreshold = 0.6.
So, the assumed allocated watts is 75W.
Now, when we get an offer, we need to check whether the available power, for the host in that offer, is
not less than 60% (the PowerTreshold) of the requested power (100W).
To put it in other words,
availablePower >= 100W * 0.75 * X
where X is the StarvationFactor (80% in this case)
// Total power per node.
var TotalPower map[string]float64
// Initialize the total power per node. This should be done before accepting any set of tasks for scheduling.
func AddTotalPowerForHost(host string, totalPower float64) bool {
// Validation
isCorrectHost := false
for _, existingHost := range Hosts {
if host == existingHost {
isCorrectHost = true
}
}
if !isCorrectHost {
return false
} else {
TotalPower[host] = totalPower
return true
}
}
Note: This constant is not used for the proactive cluster wide capping schemes.
*/
var StarvationFactor = PowerThreshold / CapMargin
// Window size for running average
var WindowSize = 160