Misc resource fixes/improvements

* Add --pprof flag to server to enable profile debugging.
* Don't cache the resource content, it seem to eat memory on bigger sites.
* Keep --printMemoryUsag running in server

Fixes #11974

commands/commandeer.go

@@ -22,6 +22,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -341,8 +342,12 @@ func (r *rootCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, args
 		if r.buildWatch {
 			defer r.timeTrack(time.Now(), "Built")
 		}
-		err := b.build()
-		return err
+		close, err := b.build()
+		if err != nil {
+			return err
+		}
+		close()
+		return nil
 	}()
 	if err != nil {
 		return err
@@ -411,6 +416,7 @@ func (r *rootCommand) PreRun(cd, runner *simplecobra.Commandeer) error {
 		MaxEntries: 1,
 		OnEvict: func(key int32, value *hugolib.HugoSites) {
 			value.Close()
+			runtime.GC()
 		},
 	})
 

commands/hugobuilder.go

@@ -361,34 +361,32 @@ func (c *hugoBuilder) newWatcher(pollIntervalStr string, dirList ...string) (*wa
 	return watcher, nil
 }
 
-func (c *hugoBuilder) build() error {
+func (c *hugoBuilder) build() (func(), error) {
 	stopProfiling, err := c.initProfiling()
 	if err != nil {
-		return err
+		return nil, err
 	}
 
-	defer func() {
-		if stopProfiling != nil {
-			stopProfiling()
-		}
-	}()
-
 	if err := c.fullBuild(false); err != nil {
-		return err
+		return nil, err
 	}
 
 	if !c.r.quiet {
 		c.r.Println()
 		h, err := c.hugo()
 		if err != nil {
-			return err
+			return nil, err
 		}
 
 		h.PrintProcessingStats(os.Stdout)
 		c.r.Println()
 	}
 
-	return nil
+	return func() {
+		if stopProfiling != nil {
+			stopProfiling()
+		}
+	}, nil
 }
 
 func (c *hugoBuilder) buildSites(noBuildLock bool) (err error) {

commands/server.go

@@ -25,6 +25,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	_ "net/http/pprof"
 	"net/url"
 	"os"
 	"os/signal"
@@ -451,6 +452,7 @@ type serverCommand struct {
 	tlsCertFile         string
 	tlsKeyFile          string
 	tlsAuto             bool
+	pprof               bool
 	serverPort          int
 	liveReloadPort      int
 	serverWatch         bool
@@ -465,6 +467,11 @@ func (c *serverCommand) Name() string {
 }
 
 func (c *serverCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, args []string) error {
+	if c.pprof {
+		go func() {
+			http.ListenAndServe("localhost:8080", nil)
+		}()
+	}
 	// Watch runs its own server as part of the routine
 	if c.serverWatch {
 
@@ -487,15 +494,19 @@ func (c *serverCommand) Run(ctx context.Context, cd *simplecobra.Commandeer, arg
 
 	}
 
+	var close func()
 	err := func() error {
 		defer c.r.timeTrack(time.Now(), "Built")
-		err := c.build()
+		var err error
+		close, err = c.build()
 		return err
 	}()
 	if err != nil {
 		return err
 	}
 
+	defer close()
+
 	return c.serve()
 }
 
@@ -520,6 +531,7 @@ of a second, you will be able to save and see your changes nearly instantly.`
 	cmd.Flags().StringVarP(&c.tlsCertFile, "tlsCertFile", "", "", "path to TLS certificate file")
 	cmd.Flags().StringVarP(&c.tlsKeyFile, "tlsKeyFile", "", "", "path to TLS key file")
 	cmd.Flags().BoolVar(&c.tlsAuto, "tlsAuto", false, "generate and use locally-trusted certificates.")
+	cmd.Flags().BoolVar(&c.pprof, "pprof", false, "enable the pprof server (port 8080)")
 	cmd.Flags().BoolVarP(&c.serverWatch, "watch", "w", true, "watch filesystem for changes and recreate as needed")
 	cmd.Flags().BoolVar(&c.noHTTPCache, "noHTTPCache", false, "prevent HTTP caching")
 	cmd.Flags().BoolVarP(&c.serverAppend, "appendPort", "", true, "append port to baseURL")