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Latest revisions

# Date Author Comment
4922cd73 05/28/2014 06:20 pm Jose A. Lopes

'Raise' called inside 'CheckPrereq' needs the prereq kw

This patch fixes the missing 'prereq' keyword in calls to 'Raise' in
the control flow of 'CheckPrereq', and updates the tests.

Signed-off-by: Jose A. Lopes <>
Reviewed-by: Hrvoje Ribicic <>
b3aa93a2 05/26/2014 06:03 pm Klaus Aehlig

Use more efficient statistics for the standard deviation

Instead of using the full sample as statistics providing
enough information to compute the standard deviation, use
a slightly more elaborate one. It contains the standard
statistics count, sum, and sum of squares, which can also...
c5da4cf1 05/26/2014 06:03 pm Klaus Aehlig

Use statistics updates when allocating on pairs

When considering the various ways of positioning an instance
on a pair of nodes, make use of the fact that the statistics
are extremely similar (only two nodes changed) and obtain the
new statistics by updating the old one, rather than by recomputing...
f66ae90a 05/26/2014 06:03 pm Klaus Aehlig

Factor score computation through abstract statistics

Logically separate the computation of the cluster score into
two steps: the computation of the abstract statistics and its
evaluation. In this way, we obtain an abstract value which we
can update instead of recomputing it when considering different...
6bb77749 05/26/2014 06:03 pm Klaus Aehlig

Verify the update of the standard deviation statistics

Add a test that verifies that the error introduced by updating
a standard-deviation statistics of a sample with at least two
elements is not too large, as compared to the direct computation.

Signed-off-by: Klaus Aehlig <>...
394a5cb9 05/26/2014 06:03 pm Klaus Aehlig

Add data type for abstract statistics

Our cluster score is a weighted sum of certain sums and
standard deviations of node characteristics. When placing
a single instance, the cluster score of a big number of
quite similar clusters are computed: that of the original...
2b296ad4 05/26/2014 06:03 pm Klaus Aehlig

Relax test requirements

Instead of insisting on perfect equality of score
allow for numerical inaccuracies and consider everything
all differences in the cluster score smaller than 1e-12
negligible. Given that, by default, a cluster with a
score of less than 1e-9 is considered perfectly balanced,...
0f63c080 05/23/2014 01:45 pm Dimitris Aragiorgis

Fix gnt-network client wrt instances report

Let the gnt-network client expect a list of instance names and not
UUIDs as returned by QueryNetworks (by both old and new style query
mechanism).

Signed-off-by: Dimitris Aragiorgis <>
Reviewed-by: Helga Velroyen <>
96092119 05/23/2014 01:45 pm Dimitris Aragiorgis

Fix QueryNetworks wrt instances

QueryNetworks tries to find which instances are connected to which
networks. The query mechanism in Haskell was written back when NICs
referred to a network via its name and not its UUID. Fix luxi to
comply with the current implementation (network slot of NIC object...
a37549ea 05/22/2014 12:02 pm Klaus Aehlig

tiered allocation: try canonical search path first

In tiered allocation, instances are put on the cluster, while they
fit---and once no more instances of the given size can be fit, smaller
instances are tried next. There is obviously some heuristics involved...

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