Display Memory request in sizing tool. (#8326)

docs/sources/installation/sizing/index.md

@@ -50,12 +50,14 @@ This tool helps to generate a Helm Charts `values.yaml` file based on specified
       <th>Write Replicas</th>
       <th>Nodes</th>
       <th>Cores</th>
+      <th>Memory</th>
     </tr>
     <tr>
       <td>{{ clusterSize.TotalReadReplicas }}</td>
       <td>{{ clusterSize.TotalWriteReplicas }}</td>
       <td>{{ clusterSize.TotalNodes}}</td>
       <td>{{ clusterSize.TotalCoresRequest}}</td>
+      <td>{{ clusterSize.TotalMemoryRequest}} GB</td>
     </tr>
     </table>
   </div>

pkg/sizing/algorithm.go

@@ -9,6 +9,7 @@ type ClusterSize struct {
 	TotalReadReplicas  int
 	TotalWriteReplicas int
 	TotalCoresRequest  float64
+	TotalMemoryRequest int
 
 	expectedMaxReadThroughputBytesSec float64
 	expectedMaxIngestBytesDay         float64
@@ -71,12 +72,15 @@ func calculateClusterSize(nt NodeType, bytesDayIngest float64, qperf QueryPerf)
 	totalReadThroughputBytesSec := totalReadReplicas * nt.readPod.rateBytesSecond
 
 	totalNodesNeeded := nodesNeededForWrites + actualNodesAddedForReads
-	totalCoresLimit := numWriteReplicasNeeded*nt.writePod.cpuRequest + totalReadReplicas*nt.readPod.cpuRequest
+	totalCoresRequest := numWriteReplicasNeeded*nt.writePod.cpuRequest + totalReadReplicas*nt.readPod.cpuRequest
+	totalMemoryRequest := numWriteReplicasNeeded*float64(nt.writePod.memoryRequest) + totalReadReplicas*float64(nt.readPod.memoryRequest)
+
 	return ClusterSize{
 		TotalNodes:         int(totalNodesNeeded),
 		TotalReadReplicas:  int(totalReadReplicas),
 		TotalWriteReplicas: int(numWriteReplicasNeeded),
-		TotalCoresRequest:  totalCoresLimit,
+		TotalCoresRequest:  totalCoresRequest,
+		TotalMemoryRequest: int(totalMemoryRequest),
 
 		expectedMaxReadThroughputBytesSec: totalReadThroughputBytesSec,
 		expectedMaxIngestBytesDay:         (nt.writePod.rateBytesSecond * numWriteReplicasNeeded) * 86400,