Minizinc model-driven example for vDNS placement

Issue-ID: OPTFRA-110
Change-Id: I3944c82e387cda15a427005f5eb6527346fc37d5
Signed-off-by: Ramki Krishnan <ramkri123@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/minizinc-examples/vDNS-service-model-driven-placement.mzn b/minizinc-examples/vDNS-service-model-driven-placement.mzn
new file mode 100644
index 0000000..08292be
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+++ b/minizinc-examples/vDNS-service-model-driven-placement.mzn
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+int: N_CLOUD_REGIONS;  % number of cloud regions 
+
+int: N_ATTRIBUTES; %  number of capability related attributes
+array[1..N_ATTRIBUTES] of float: W_ATTRIBUTES; % weights of each attribute
+
+int: N_METRICS; % number of dynamic capacity metrics of interest
+array[1..N_METRICS] of float: W_METRICS; % weights of each capacity metric
+
+int: CUST_TYPE;  % customer type, 0 = regular, 1 = silver, 2 = gold
+
+enum CUST_TYPES = { STANDARD, SILVER, GOLD };
+enum ATTRIBUTES = { CORE_DC, DIRECT_CONN, MIN_GUARANTEE, SRIOV };
+enum METRICS = { AVG_UTILIZATION, PEAK_UTILIZATION };
+ 
+% whether a cloud region has the corresponding capability -- data will be customer specific
+array[1..N_CLOUD_REGIONS, 1..N_ATTRIBUTES] of int: capabilities; 
+array[1..N_CLOUD_REGIONS, 1..N_METRICS] of float: utilization;  % how much capacity is already utilized (fraction)
+
+var int: s;  % target cloud region (solution to the problem)
+
+% custom constraints
+constraint capabilities[s, CORE_DC] = 1;   % hard constraint: has to be placed in CORE DC
+constraint utilization[s, AVG_UTILIZATION] <= 0.85;   % hard constraint: need some capacity available
+% custom soft constraint for gold customers -- give a large weight to direct connection
+var float: additional_obj = bool2int(CUST_TYPE = GOLD) * capabilities[s, DIRECT_CONN] * 1000;
+
+% TODO: global constraints (such as data validation)
+
+% Objective for utilization
+var float: obj_utilization = sum(k in 1..N_METRICS) ( W_METRICS[k] * (1 - utilization[s, k]) );
+
+% Objective for capabilities
+var float: obj_capabilities = sum(k in 1..N_ATTRIBUTES) ( W_ATTRIBUTES[k] * capabilities[s, k] );
+
+% Overall objective function
+var float: obj = obj_utilization + obj_capabilities + additional_obj;  % can later add weights to each...
+
+solve maximize obj;
+
+output ["Cloud Region: ", show(s), "\n", "Objective function value: ", show(obj), "\n", "Customer type: ", show(CUST_TYPE), "\n"];