cmd/trace: beautify goroutine page

- Summary: also includes links to pprof data.
- Sortable table: sorting is done on server-side. The intention is
  that later, I want to add pagination feature and limit the page
  size the browser has to handle.
- Stacked horizontal bar graph to present total time breakdown.
- Human-friendly time representation.
- No dependency on external fancy javascript libraries to allow
  it to function without an internet connection.

Change-Id: I91e5c26746e59ad0329dfb61e096e11f768c7b73
Reviewed-on: https://go-review.googlesource.com/102156
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

src/cmd/trace/goroutines.go

@@ -10,10 +10,13 @@ import (
 	"fmt"
 	"html/template"
 	"internal/trace"
+	"log"
 	"net/http"
+	"reflect"
 	"sort"
 	"strconv"
 	"sync"
+	"time"
 )
 
 func init() {
@@ -29,34 +32,6 @@ type gtype struct {
 	ExecTime int64  // Total execution time of all goroutines in this group.
 }
 
-type gtypeList []gtype
-
-func (l gtypeList) Len() int {
-	return len(l)
-}
-
-func (l gtypeList) Less(i, j int) bool {
-	return l[i].ExecTime > l[j].ExecTime
-}
-
-func (l gtypeList) Swap(i, j int) {
-	l[i], l[j] = l[j], l[i]
-}
-
-type gdescList []*trace.GDesc
-
-func (l gdescList) Len() int {
-	return len(l)
-}
-
-func (l gdescList) Less(i, j int) bool {
-	return l[i].TotalTime > l[j].TotalTime
-}
-
-func (l gdescList) Swap(i, j int) {
-	l[i], l[j] = l[j], l[i]
-}
-
 var (
 	gsInit sync.Once
 	gs     map[uint64]*trace.GDesc
@@ -86,13 +61,17 @@ func httpGoroutines(w http.ResponseWriter, r *http.Request) {
 		gs1.ExecTime += g.ExecTime
 		gss[g.PC] = gs1
 	}
-	var glist gtypeList
+	var glist []gtype
 	for k, v := range gss {
 		v.ID = k
 		glist = append(glist, v)
 	}
-	sort.Sort(glist)
-	templGoroutines.Execute(w, glist)
+	sort.Slice(glist, func(i, j int) bool { return glist[i].ExecTime > glist[j].ExecTime })
+	w.Header().Set("Content-Type", "text/html;charset=utf-8")
+	if err := templGoroutines.Execute(w, glist); err != nil {
+		log.Printf("failed to execute template: %v", err)
+		return
+	}
 }
 
 var templGoroutines = template.Must(template.New("").Parse(`
@@ -108,64 +87,201 @@ Goroutines: <br>
 
 // httpGoroutine serves list of goroutines in a particular group.
 func httpGoroutine(w http.ResponseWriter, r *http.Request) {
+	// TODO(hyangah): support format=csv (raw data)
+
 	events, err := parseEvents()
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
+
 	pc, err := strconv.ParseUint(r.FormValue("id"), 10, 64)
 	if err != nil {
 		http.Error(w, fmt.Sprintf("failed to parse id parameter '%v': %v", r.FormValue("id"), err), http.StatusInternalServerError)
 		return
 	}
 	analyzeGoroutines(events)
-	var glist gdescList
+	var (
+		glist                   []*trace.GDesc
+		name                    string
+		totalExecTime, execTime int64
+		maxTotalTime            int64
+	)
+
 	for _, g := range gs {
+		totalExecTime += g.ExecTime
+
 		if g.PC != pc {
 			continue
 		}
 		glist = append(glist, g)
+		name = g.Name
+		execTime += g.ExecTime
+		if maxTotalTime < g.TotalTime {
+			maxTotalTime = g.TotalTime
+		}
 	}
-	sort.Sort(glist)
+
+	execTimePercent := ""
+	if totalExecTime > 0 {
+		execTimePercent = fmt.Sprintf("%.2f%%", float64(execTime)/float64(totalExecTime)*100)
+	}
+
+	sortby := r.FormValue("sortby")
+	_, ok := reflect.TypeOf(trace.GDesc{}).FieldByNameFunc(func(s string) bool {
+		return s == sortby
+	})
+	if !ok {
+		sortby = "TotalTime"
+	}
+
+	sort.Slice(glist, func(i, j int) bool {
+		ival := reflect.ValueOf(glist[i]).Elem().FieldByName(sortby).Int()
+		jval := reflect.ValueOf(glist[j]).Elem().FieldByName(sortby).Int()
+		return ival > jval
+	})
+
 	err = templGoroutine.Execute(w, struct {
-		PC    uint64
-		GList gdescList
-	}{pc, glist})
+		Name            string
+		PC              uint64
+		N               int
+		ExecTimePercent string
+		MaxTotal        int64
+		GList           []*trace.GDesc
+	}{
+		Name:            name,
+		PC:              pc,
+		N:               len(glist),
+		ExecTimePercent: execTimePercent,
+		MaxTotal:        maxTotalTime,
+		GList:           glist})
 	if err != nil {
 		http.Error(w, fmt.Sprintf("failed to execute template: %v", err), http.StatusInternalServerError)
 		return
 	}
 }
 
-var templGoroutine = template.Must(template.New("").Parse(`
-<html>
-<body>
-<table border="1" sortable="1">
+var templGoroutine = template.Must(template.New("").Funcs(template.FuncMap{
+	"prettyDuration": func(nsec int64) template.HTML {
+		d := time.Duration(nsec) * time.Nanosecond
+		return template.HTML(niceDuration(d))
+	},
+	"percent": func(dividened, divisor int64) template.HTML {
+		if divisor == 0 {
+			return ""
+		}
+		return template.HTML(fmt.Sprintf("(%.1f%%)", float64(dividened)/float64(divisor)*100))
+	},
+	"barLen": func(dividened, divisor int64) template.HTML {
+		if divisor == 0 {
+			return "0"
+		}
+		return template.HTML(fmt.Sprintf("%.2f%%", float64(dividened)/float64(divisor)*100))
+	},
+	"unknownTime": func(desc *trace.GDesc) int64 {
+		sum := desc.ExecTime + desc.IOTime + desc.BlockTime + desc.SyscallTime + desc.SchedWaitTime
+		if sum < desc.TotalTime {
+			return desc.TotalTime - sum
+		}
+		return 0
+	},
+}).Parse(`
+<!DOCTYPE html>
+<title>Goroutine {{.Name}}</title>
+<style>
+th {
+  background-color: #050505;
+  color: #fff;
+}
+table {
+  border-collapse: collapse;
+}
+.details tr:hover {
+  background-color: #f2f2f2;
+}
+.details td {
+  text-align: right;
+  border: 1px solid black;
+}
+.details td.id {
+  text-align: left;
+}
+.stacked-bar-graph {
+  width: 300px;
+  height: 10px;
+  color: #414042;
+  white-space: nowrap;
+  font-size: 5px;
+}
+.stacked-bar-graph span {
+  display: inline-block;
+  width: 100%;
+  height: 100%;
+  box-sizing: border-box;
+  float: left;
+  padding: 0;
+}
+.unknown-time { background-color: #636363; }
+.exec-time { background-color: #d7191c; }
+.io-time { background-color: #fdae61; }
+.block-time { background-color: #d01c8b; }
+.syscall-time { background-color: #7b3294; }
+.sched-time { background-color: #2c7bb6; }
+</style>
+
+<script>
+function reloadTable(key, value) {
+  let params = new URLSearchParams(window.location.search);
+  params.set(key, value);
+  window.location.search = params.toString();
+}
+</script>
+
+<table class="summary">
+	<tr><td>Goroutine Name:</td><td>{{.Name}}</td></tr>
+	<tr><td>Number of Goroutines:</td><td>{{.N}}</td></tr>
+	<tr><td>Execution Time:</td><td>{{.ExecTimePercent}} of total program execution time </td> </tr>
+	<tr><td>Network Wait Time:</td><td> <a href="/io?id={{.PC}}">graph</a><a href="/io?id={{.PC}}&raw=1" download="io.profile">(download)</a></td></tr>
+	<tr><td>Sync Block Time:</td><td> <a href="/block?id={{.PC}}">graph</a><a href="/block?id={{.PC}}&raw=1" download="block.profile">(download)</a></td></tr>
+	<tr><td>Blocking Syscall Time:</td><td> <a href="/syscall?id={{.PC}}">graph</a><a href="/syscall?id={{.PC}}&raw=1" download="syscall.profile">(download)</a></td></tr>
+	<tr><td>Scheduler Wait Time:</td><td> <a href="/sched?id={{.PC}}">graph</a><a href="/sched?id={{.PC}}&raw=1" download="sched.profile">(download)</a></td></tr>
+</table>
+<p>
+<table class="details">
 <tr>
-<th> Goroutine </th>
-<th> Total time, ns </th>
-<th> Execution time, ns </th>
-<th> <a href="/io?id={{.PC}}">Network wait time, ns</a><a href="/io?id={{.PC}}&raw=1" download="io.profile">⬇</a> </th>
-<th> <a href="/block?id={{.PC}}">Sync block time, ns</a><a href="/block?id={{.PC}}&raw=1" download="block.profile">⬇</a> </th>
-<th> <a href="/syscall?id={{.PC}}">Blocking syscall time, ns</a><a href="/syscall?id={{.PC}}&raw=1" download="syscall.profile">⬇</a> </th>
-<th> <a href="/sched?id={{.PC}}">Scheduler wait time, ns</a><a href="/sched?id={{.PC}}&raw=1" download="sched.profile">⬇</a> </th>
-<th> GC sweeping time, ns </th>
-<th> GC pause time, ns </th>
+<th> Goroutine</th>
+<th onclick="reloadTable('sortby', 'TotalTime')"> Total</th>
+<th></th>
+<th onclick="reloadTable('sortby', 'ExecTime')" class="exec-time"> Execution</th>
+<th onclick="reloadTable('sortby', 'IOTime')" class="io-time"> Network wait</th>
+<th onclick="reloadTable('sortby', 'BlockTime')" class="block-time"> Sync block </th>
+<th onclick="reloadTable('sortby', 'SyscallTime')" class="syscall-time"> Blocking syscall</th>
+<th onclick="reloadTable('sortby', 'SchedWaitTime')" class="sched-time"> Scheduler wait</th>
+<th onclick="reloadTable('sortby', 'SweepTime')"> GC sweeping</th>
+<th onclick="reloadTable('sortby', 'GCTime')"> GC pause</th>
 </tr>
 {{range .GList}}
   <tr>
     <td> <a href="/trace?goid={{.ID}}">{{.ID}}</a> </td>
-    <td> {{.TotalTime}} </td>
-    <td> {{.ExecTime}} </td>
-    <td> {{.IOTime}} </td>
-    <td> {{.BlockTime}} </td>
-    <td> {{.SyscallTime}} </td>
-    <td> {{.SchedWaitTime}} </td>
-    <td> {{.SweepTime}} </td>
-    <td> {{.GCTime}} </td>
+    <td> {{prettyDuration .TotalTime}} </td>
+    <td>
+	<div class="stacked-bar-graph">
+	  {{if unknownTime .}}<span style="width:{{barLen (unknownTime .) $.MaxTotal}}" class="unknown-time">&nbsp;</span>{{end}}
+          {{if .ExecTime}}<span style="width:{{barLen .ExecTime $.MaxTotal}}" class="exec-time">&nbsp;</span>{{end}}
+          {{if .IOTime}}<span style="width:{{barLen .IOTime $.MaxTotal}}" class="io-time">&nbsp;</span>{{end}}
+          {{if .BlockTime}}<span style="width:{{barLen .BlockTime $.MaxTotal}}" class="block-time">&nbsp;</span>{{end}}
+          {{if .SyscallTime}}<span style="width:{{barLen .SyscallTime $.MaxTotal}}" class="syscall-time">&nbsp;</span>{{end}}
+          {{if .SchedWaitTime}}<span style="width:{{barLen .SchedWaitTime $.MaxTotal}}" class="sched-time">&nbsp;</span>{{end}}
+        </div>
+    </td>
+    <td> {{prettyDuration .ExecTime}}</td>
+    <td> {{prettyDuration .IOTime}}</td>
+    <td> {{prettyDuration .BlockTime}}</td>
+    <td> {{prettyDuration .SyscallTime}}</td>
+    <td> {{prettyDuration .SchedWaitTime}}</td>
+    <td> {{prettyDuration .SweepTime}} {{percent .SweepTime .TotalTime}}</td>
+    <td> {{prettyDuration .GCTime}} {{percent .GCTime .TotalTime}}</td>
   </tr>
 {{end}}
 </table>
-</body>
-</html>
 `))