diff --git a/cmd/grf/cmds/commands.go b/cmd/grf/cmds/commands.go
index 15dc121..88054dd 100644
--- a/cmd/grf/cmds/commands.go
+++ b/cmd/grf/cmds/commands.go
@@ -36,6 +36,9 @@ var (
 	conf        *config.Config
 	loadConfErr error
 	outFile     string
+
+	// logFlag is whether to log debug statements.
+	logFlag bool
 )
 
 // New returns an initialized command tree.
@@ -104,6 +107,8 @@ You'll have to wait for goref until it outputs 'successfully output to ...', or
 	versionCommand.Flags().BoolVarP(&versionVerbose, "verbose", "v", false, "print verbose version info")
 	rootCommand.AddCommand(versionCommand)
 
+	rootCommand.PersistentFlags().BoolVarP(&logFlag, "log", "", false, "Enable goref logging.")
+
 	return rootCommand
 }
 
@@ -129,6 +134,11 @@ func coreCmd(_ *cobra.Command, args []string) {
 }
 
 func execute(attachPid int, exeFile, coreFile, outFile string, conf *config.Config) int {
+	if err := logflags.Setup(logFlag, "", ""); err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return 1
+	}
+	defer logflags.Close()
 	if loadConfErr != nil {
 		logflags.DebuggerLogger().Errorf("%v", loadConfErr)
 	}
diff --git a/pkg/proc/eval.go b/pkg/proc/eval.go
index 59f1253..98191ca 100644
--- a/pkg/proc/eval.go
+++ b/pkg/proc/eval.go
@@ -167,7 +167,7 @@ func extractVarInfoFromEntry(bi *proc.BinaryInfo, image *proc.Image, regs op.Dwa
 	t, err = resolveParametricType(bi, mem, t, dictAddr, mds)
 	if err != nil {
 		// Log the error, keep going with t, which will be the shape type
-		logflags.DebuggerLogger().Errorf("could not resolve parametric type of %s: %v", n, err)
+		logflags.DebuggerLogger().Warnf("could not resolve parametric type of %s: %v", n, err)
 	}
 
 	addr, pieces, _, _ := bi.Location(entry, dwarf.AttrLocation, regs.PC(), regs, mem)
diff --git a/pkg/proc/gcmask.go b/pkg/proc/gcmask.go
index 04a749c..6bf30dd 100644
--- a/pkg/proc/gcmask.go
+++ b/pkg/proc/gcmask.go
@@ -25,7 +25,6 @@ type gcMaskBitIterator struct {
 	maskBase Address
 	mask     []uint64
 
-	// for iterator
 	addr Address // iterator address
 }
 
diff --git a/pkg/proc/heap.go b/pkg/proc/heap.go
index 3b44183..4e7db08 100644
--- a/pkg/proc/heap.go
+++ b/pkg/proc/heap.go
@@ -373,7 +373,7 @@ func (s *HeapScope) readType(sp *spanInfo, typeAddr, addr, end Address) {
 		}
 		mask, err := readUintRaw(mem, uint64(gcDataAddr.Add(addr.Sub(elem)/64)), 8)
 		if err != nil {
-			logflags.DebuggerLogger().Errorf("read gc data addr error: %v", err)
+			logflags.DebuggerLogger().Warnf("read gc data addr error: %v", err)
 			break
 		}
 		var headBits int64
diff --git a/pkg/proc/mem.go b/pkg/proc/mem.go
index 0769f6c..5ae2a80 100644
--- a/pkg/proc/mem.go
+++ b/pkg/proc/mem.go
@@ -19,7 +19,10 @@ import (
 	"github.com/go-delve/delve/pkg/proc"
 )
 
-const cacheEnabled = true
+const (
+	cacheEnabled   = true
+	cacheThreshold = 1024 * 1024 * 1024 // 1GB
+)
 
 type memCache struct {
 	loaded    bool
@@ -68,6 +71,9 @@ func cacheMemory(mem proc.MemoryReadWriter, addr uint64, size int) proc.MemoryRe
 		// overflow
 		return mem
 	}
+	if size > cacheThreshold {
+		return mem
+	}
 	switch cacheMem := mem.(type) {
 	case *memCache:
 		if cacheMem.contains(addr, size) {