diff --git a/lldb/include/lldb/API/SBDebugger.h b/lldb/include/lldb/API/SBDebugger.h
--- a/lldb/include/lldb/API/SBDebugger.h
+++ b/lldb/include/lldb/API/SBDebugger.h
@@ -199,6 +199,10 @@
 
   bool GetUseColor() const;
 
+  bool SetUseSourceCache(bool use_source_cache);
+
+  bool GetUseSourceCache() const;
+
   static bool GetDefaultArchitecture(char *arch_name, size_t arch_name_len);
 
   static bool SetDefaultArchitecture(const char *arch_name);
diff --git a/lldb/include/lldb/Core/Debugger.h b/lldb/include/lldb/Core/Debugger.h
--- a/lldb/include/lldb/Core/Debugger.h
+++ b/lldb/include/lldb/Core/Debugger.h
@@ -273,6 +273,10 @@
 
   bool SetUseColor(bool use_color);
 
+  bool GetUseSourceCache() const;
+
+  bool SetUseSourceCache(bool use_source_cache);
+
   bool GetHighlightSource() const;
 
   lldb::StopShowColumn GetStopShowColumn() const;
diff --git a/lldb/include/lldb/Core/SourceManager.h b/lldb/include/lldb/Core/SourceManager.h
--- a/lldb/include/lldb/Core/SourceManager.h
+++ b/lldb/include/lldb/Core/SourceManager.h
@@ -101,6 +101,9 @@
     void AddSourceFile(const FileSP &file_sp);
     FileSP FindSourceFile(const FileSpec &file_spec) const;
 
+    // Removes all elements from the cache.
+    void Clear() { m_file_cache.clear(); }
+
   protected:
     typedef std::map<FileSpec, FileSP> FileCache;
     FileCache m_file_cache;
diff --git a/lldb/source/API/SBDebugger.cpp b/lldb/source/API/SBDebugger.cpp
--- a/lldb/source/API/SBDebugger.cpp
+++ b/lldb/source/API/SBDebugger.cpp
@@ -1374,6 +1374,18 @@
   return (m_opaque_sp ? m_opaque_sp->GetUseColor() : false);
 }
 
+bool SBDebugger::SetUseSourceCache(bool value) {
+  LLDB_RECORD_METHOD(bool, SBDebugger, SetUseSourceCache, (bool), value);
+
+  return (m_opaque_sp ? m_opaque_sp->SetUseSourceCache(value) : false);
+}
+
+bool SBDebugger::GetUseSourceCache() const {
+  LLDB_RECORD_METHOD_CONST_NO_ARGS(bool, SBDebugger, GetUseSourceCache);
+
+  return (m_opaque_sp ? m_opaque_sp->GetUseSourceCache() : false);
+}
+
 bool SBDebugger::GetDescription(SBStream &description) {
   LLDB_RECORD_METHOD(bool, SBDebugger, GetDescription, (lldb::SBStream &),
                      description);
diff --git a/lldb/source/Core/CoreProperties.td b/lldb/source/Core/CoreProperties.td
--- a/lldb/source/Core/CoreProperties.td
+++ b/lldb/source/Core/CoreProperties.td
@@ -103,6 +103,10 @@
     Global,
     DefaultTrue,
     Desc<"Whether to use Ansi color codes or not.">;
+  def UseSourceCache: Property<"use-source-cache", "Boolean">,
+    Global,
+    DefaultTrue,
+    Desc<"Whether to cache source files in memory or not.">;
   def AutoOneLineSummaries: Property<"auto-one-line-summaries", "Boolean">,
     Global,
     DefaultTrue,
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -212,6 +212,11 @@
       // use-color changed. Ping the prompt so it can reset the ansi terminal
       // codes.
       SetPrompt(GetPrompt());
+    } else if (property_path == g_debugger_properties[ePropertyUseSourceCache].name) {
+      // use-source-cache changed. Wipe out the cache contents if it was disabled.
+      if (!GetUseSourceCache()) {
+        m_source_file_cache.Clear();
+      }
     } else if (is_load_script && target_sp &&
                load_script_old_value == eLoadScriptFromSymFileWarn) {
       if (target_sp->TargetProperties::GetLoadScriptFromSymbolFile() ==
@@ -338,6 +343,20 @@
   return ret;
 }
 
+bool Debugger::GetUseSourceCache() const {
+  const uint32_t idx = ePropertyUseSourceCache;
+  return m_collection_sp->GetPropertyAtIndexAsBoolean(
+      nullptr, idx, g_debugger_properties[idx].default_uint_value != 0);
+}
+
+bool Debugger::SetUseSourceCache(bool b) {
+  const uint32_t idx = ePropertyUseSourceCache;
+  bool ret = m_collection_sp->SetPropertyAtIndexAsBoolean(nullptr, idx, b);
+  if (!ret) {
+    m_source_file_cache.Clear();
+  }
+  return ret;
+}
 bool Debugger::GetHighlightSource() const {
   const uint32_t idx = ePropertyHighlightSource;
   return m_collection_sp->GetPropertyAtIndexAsBoolean(
diff --git a/lldb/source/Core/SourceManager.cpp b/lldb/source/Core/SourceManager.cpp
--- a/lldb/source/Core/SourceManager.cpp
+++ b/lldb/source/Core/SourceManager.cpp
@@ -72,7 +72,7 @@
   FileSP file_sp;
   if (same_as_previous)
     file_sp = m_last_file_sp;
-  else if (debugger_sp)
+  else if (debugger_sp && debugger_sp->GetUseSourceCache())
     file_sp = debugger_sp->GetSourceFileCache().FindSourceFile(file_spec);
 
   TargetSP target_sp(m_target_wp.lock());
@@ -95,7 +95,7 @@
     else
       file_sp = std::make_shared<File>(file_spec, debugger_sp);
 
-    if (debugger_sp)
+    if (debugger_sp && debugger_sp->GetUseSourceCache())
       debugger_sp->GetSourceFileCache().AddSourceFile(file_sp);
   }
   return file_sp;