diff --git a/pt/pt.h b/pt/pt.h
index 82dcf5c..481be72 100644
--- a/pt/pt.h
+++ b/pt/pt.h
@@ -500,10 +500,12 @@ class pt_fuzzer {
 };
 
 class fuzzer_config {
+public:
     uint64_t perf_aux_size = DEFAULT_PERF_AUX_SZ;
     branch_info_mode_t branch_mode = TNT_MODE;
 public:
-    fuzzer_config();
+    fuzzer_config() {load_config();}
+protected:
     void load_config();
 };
 fuzzer_config& get_fuzzer_config();
diff --git a/pt/pt_decoder.cpp b/pt/pt_decoder.cpp
index eebfa9b..2a5db9d 100644
--- a/pt/pt_decoder.cpp
+++ b/pt/pt_decoder.cpp
@@ -92,7 +92,7 @@ void load_config_file(std::map<std::string, std::string>& config_kvs) {
 }
 
 void fuzzer_config::load_config() {
-    std::map<std::string, std::string>& config_kvs;
+    std::map<std::string, std::string> config_kvs;
     load_config_file(config_kvs);
 
     std::string branch_mode = config_kvs["BRANCH_MODE"];
@@ -133,7 +133,6 @@ void fuzzer_config::load_config() {
 
 fuzzer_config& get_fuzzer_config() {
     static fuzzer_config config;
-    config.load_config();
     return config;
 }
 
diff --git a/ptfuzzer.py b/ptfuzzer.py
index 76df5ba..0ad4345 100755
--- a/ptfuzzer.py
+++ b/ptfuzzer.py
@@ -16,8 +16,9 @@ def load_config():
     if f != None:
         for line in f.readlines():
             pos = line.find('#')
-            print "pos = ", pos 
-            line = line[0, pos]
+            #print "pos = ", pos 
+            line = line[0:pos]
+            #print line
             line.strip()
             if len(line) == 0:
                 continue
@@ -34,6 +35,7 @@ def load_config():
 mem_limit = None
 if conf.has_key("MEM_LIMIT"):
     mem_limit = int(conf["MEM_LIMIT"])
+    print "config MEM_LIMIT to", mem_limit
     
 parser = argparse.ArgumentParser(description='Process arguements and bin name.')
 parser.add_argument('afl_args', type=str, help='arguements of AFL')