private static IEnumerable <NodeHistory> NodesFromInstanceSetHistory(
IEnumerable <InstanceHistory> instanceHistories,
Tenancies tenancies)
{
var placementsByServer = instanceHistories
.Where(i => i.Placements != null)
.SelectMany(i => i.Placements.Select(p => new
{
Instance = i,
p.ServerId,
p.From,
p.To,
p.Tenancy
}))
.Where(p => tenancies.HasFlag(p.Tenancy))
.GroupBy(p => p.ServerId);
foreach (var server in placementsByServer)
{
var peakInstanceCount = (uint)TimeseriesUtil.HighWatermark(
server.Select(p => p.From),
server.Select(p => p.To));
yield return(new NodeHistory(
server.Key,
server.Select(p => p.From).Min(),
server.Select(p => p.To).Max(),
peakInstanceCount,
server.Select(p => new NodePlacement(p.From, p.To, p.Instance))));
}
}
/// <summary>
/// Create time series indicating the maximum number of parallel
/// physical cores for each day of this set's existence.
/// </summary>
public IEnumerable <DataPoint> MaxPhysicalCoresByDay(Func <NodeTypeLocator, int> resolveCoreCount) =>
this.Nodes == null
? Enumerable.Empty <DataPoint>()
: TimeseriesUtil.DailyHistogram(
this.Nodes.Select(p => new DataPoint(p.FirstUse, resolveCoreCount(p.NodeType))),
this.Nodes.Select(p => new DataPoint(p.LastUse, resolveCoreCount(p.NodeType))));