diff --git a/benchmark/README.md b/benchmark/README.md
index c73c847..d945e98 100644
--- a/benchmark/README.md
+++ b/benchmark/README.md
@@ -1,5 +1,9 @@
 # dmclock benchmarking
 
+**IMPORTANT**: now that K_WAY_HEAP is no longer allowed to have the
+value 1, the shell and Python scripts that generate the PDFs no longer
+work exactly correctly. Some effort to debug is necessary.
+
 This directory contains scripts to evaluate effects of different
 branching-factors (k=1 to k=11) in the IndirectIntrusiveHeap
 data-structure. IndirectIntrusiveHeap is now a k-way heap, so finding
diff --git a/benchmark/data_gen.sh b/benchmark/data_gen.sh
index 133da87..80a77bd 100755
--- a/benchmark/data_gen.sh
+++ b/benchmark/data_gen.sh
@@ -23,10 +23,10 @@ if [ "$3" != "" ]; then
   repeat="$3"
 fi
 
-echo "k-way: $k_way, num_repeat:$repeat"
+echo "k-way:$k_way, num_repeat:$repeat"
 
 # create simulators in different directories 
-k=1
+k=2
 while [ $k -le $k_way ]
 do
   mkdir "build_$k"
@@ -43,7 +43,7 @@ done
 echo '' > $output_file
 for config in "$config_dir"/*.conf
 do
-  k=1
+  k=2
   while [ $k -le $k_way ]
   do
     cd "build_$k"
diff --git a/benchmark/data_parser.py b/benchmark/data_parser.py
index f6f84d7..c90d85f 100755
--- a/benchmark/data_parser.py
+++ b/benchmark/data_parser.py
@@ -136,10 +136,10 @@ def create_header(num_cols):
   header = fields[0]
   #write add_req_{1, ...}
   for i in range(num_cols):
-    header = '%s %s_%i'%(header, fields[1], i+1)
+    header = '%s %s_%i'%(header, fields[1], i+2)
   #write complete_req_{1, ...}
   for i in range(num_cols):
-    header = '%s %s_%i'%(header, fields[2], i+1)
+    header = '%s %s_%i'%(header, fields[2], i+2)
   # new-line
   header = '%s\n'%(header)
   return header
diff --git a/benchmark/run.sh b/benchmark/run.sh
index 0d030cf..11432b5 100755
--- a/benchmark/run.sh
+++ b/benchmark/run.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
 # default value
-k_way=2 #11
-repeat=3 #5
+k_way=3 #11
+repeat=2 #5
 
 output_file="" 
 if [ "$1" != "" ]; then
@@ -21,4 +21,4 @@ python data_parser.py ${output_file}
 echo "now generating bar-chart"
 #gnuplot -e 'output_file=value'  plot_gen.gnuplot 
 sh plot_gen.sh  ${output_file} ${k_way}
-echo "done! check ${output_file}.pdf"
\ No newline at end of file
+echo "done! check ${output_file}.pdf"