Improve performance and reduce memory consumption drastically

ISPChk/Controllers/HostController.cs

@@ -56,11 +56,10 @@ namespace ISPChk.Controllers
                 return NotFound();
             }
 
-            var startTime = DateTimeOffset.FromUnixTimeMilliseconds(start);
+            var startTime = DateTimeOffset.FromUnixTimeMilliseconds(start).DateTime;
-            var endTime = DateTimeOffset.FromUnixTimeMilliseconds(end);
+            var endTime = DateTimeOffset.FromUnixTimeMilliseconds(end).DateTime;
 
-            _context.Entry(host).Collection(h => h.PingItems).Load();
+            var pis = _context.Entry(host).Collection(h => h.PingItems).Query().Where(p => p.Date > startTime).ToList();
-            var pis = host.PingItems.Where(p => p.Date > startTime).ToList();
 
             return pis;
         }

ISPChk/Models/PingItem.cs

@@ -10,7 +10,7 @@ namespace ISPChk.Models
     {
         [Key]
         public long PingId { get; set; }
-        public DateTimeOffset Date { get; set; }
+        public DateTime Date { get; set; }
         public float Min { get; set; }
         public float Max { get; set; }
         public float Avg { get; set; }

ISPChk/NetworkTest.cs

@@ -23,7 +23,7 @@ namespace ISPChk
 
         public async void LoadHostsFromDatabase()
         {
-            List<Host> hosts = await _context.Hosts.Include(host => host.PingItems).ToListAsync();
+            List<Host> hosts = await _context.Hosts.ToListAsync();
             foreach (Host host in hosts)
             {
                 AddHost(host);
@@ -47,7 +47,7 @@ namespace ISPChk
                 // Do not use the outer context, not threadsafe?
                 var ctx = CreateDbContext();
                 var h = await ctx.Hosts.FindAsync(host.HostId);
-                ctx.Entry(h).Collection(hst => hst.PingItems).Load();
+                ctx.Entry(h).Collection(hst => hst.PingItems).Query().FirstOrDefault();
 
                 IPAddress pingAddress;
 
@@ -139,7 +139,7 @@ namespace ISPChk
                     if (min > timeout)
                         min = 0;
                     System.Diagnostics.Debug.WriteLine(h.HostName+": "+"min:" + min + " max:" + max + " avg:" + avg);
-                    PingItem pi = new PingItem { Date = DateTimeOffset.UtcNow, Min = min, Max = max, Avg = avg, Failures = failures };
+                    PingItem pi = new PingItem { Date = DateTimeOffset.UtcNow.DateTime, Min = min, Max = max, Avg = avg, Failures = failures };
                     h.PingItems.Add(pi);
                     ctx.SaveChanges();
                     // Throttle if everything is ok

ISPChk/wwwroot/index.html

@@ -67,14 +67,10 @@
             </div>
         </div>
         <div class="row">
-            <div class="col-sm">
-            </div>
             <div class="col-sm">
                 <div id="chartContainerButtons">
                 </div>
             </div>
-            <div class="col-sm">
-            </div>
         </div>
         <div id="chartContainer" class="row">
             

ISPChk/wwwroot/ispchk.js

@@ -128,8 +128,8 @@ async function updateGraphs() {
                     },
                     {
                         label: 'fail',
-                        type: 'bar',
+                        //type: 'bar',
-                        backgroundColor: 'rgba(0, 0, 0, 0.6)',
+                        backgroundColor: 'rgba(0, 0, 0, 0.3)',
                         borderColor: 'rgb(0, 0, 0)',
                         yAxisID: "y-loss",
                         data: val.failures