CDash:Design: Difference between revisions
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(New page: = Test Timing = Added since CDash 1.0. CDash supports timing defects for tests. CDash keeps in the database a current weighted average of the mean and standard deviation for each test time...) |
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= Test Timing = | = Test Timing = | ||
Added | Added in CDash 1.0. CDash supports timing defects for tests. CDash keeps in the database a current weighted average of the mean and standard deviation for each test time for each build. In order to keep the computation as light as a process as possible, the following formula is used, involving only the previous build. | ||
newMean = (1-alpha)*oldMean + alpha*currentTime | newMean = (1-alpha)*oldMean + alpha*currentTime | ||
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One can notice that alpha defines the current “window” for the computation. By default alpha is set to 0.3. | One can notice that alpha defines the current “window” for the computation. By default alpha is set to 0.3. | ||
= Daily Updates = | |||
Added in CDash 1.0, daily updates from the repository are stored in the database (instead of polling the CVS/SVN server every time the page was accessed. | |||
Revision as of 16:58, 5 May 2008
Test Timing
Added in CDash 1.0. CDash supports timing defects for tests. CDash keeps in the database a current weighted average of the mean and standard deviation for each test time for each build. In order to keep the computation as light as a process as possible, the following formula is used, involving only the previous build.
newMean = (1-alpha)*oldMean + alpha*currentTime newSD = sqrt((1-alpha)*SD*SD + alpha*(currentTime-newMean)* (currentTime-newMean)
A test is defined as failing if it verifies the following:
if previousSD < thresholdSD then previousSD = thresholdSD. if currentTime > previousMean*multiplier*previousSD.
One can notice that alpha defines the current “window” for the computation. By default alpha is set to 0.3.
Daily Updates
Added in CDash 1.0, daily updates from the repository are stored in the database (instead of polling the CVS/SVN server every time the page was accessed.
