diff --git a/tools/benchmark.sh b/tools/benchmark.sh
index b0d1babd9..09a2fb369 100755
--- a/tools/benchmark.sh
+++ b/tools/benchmark.sh
@@ -109,6 +109,10 @@ function summarize_result {
   test_name=$2
   bench_name=$3
 
+  # Note that this function assumes that the benchmark executes long enough so
+  # that "Compaction Stats" is written to stdout at least once. If it won't
+  # happen then empty output from grep when searching for "Sum" will cause
+  # syntax errors.
   uptime=$( grep ^Uptime\(secs $test_out | tail -1 | awk '{ printf "%.0f", $2 }' )
   stall_time=$( grep "^Cumulative stall" $test_out | tail -1  | awk '{  print $3 }' )
   stall_pct=$( grep "^Cumulative stall" $test_out| tail -1  | awk '{  print $5 }' )
@@ -159,8 +163,22 @@ function run_bulkload {
 }
 
 function run_fillseq {
-  # This runs with a vector memtable and the WAL disabled to load faster. It is still crash safe and the
-  # client can discover where to restart a load after a crash. I think this is a good way to load.
+  # This runs with a vector memtable. WAL can be either disabled or enabled
+  # depending on the input parameter (1 for disabled, 0 for enabled). The main
+  # benefit behind disabling WAL is to make loading faster. It is still crash
+  # safe and the client can discover where to restart a load after a crash. I
+  # think this is a good way to load.
+
+  # Make sure that we'll have unique names for all the files so that data won't
+  # be overwritten.
+  if [ $1 == 1 ]; then
+    log_file_name=$output_dir/benchmark_fillseq.wal_disabled.v${value_size}.log
+    test_name=fillseq.wal_disabled.v${value_size}
+  else
+    log_file_name=$output_dir/benchmark_fillseq.wal_enabled.v${value_size}.log
+    test_name=fillseq.wal_enabled.v${value_size}
+  fi
+
   echo "Loading $num_keys keys sequentially"
   cmd="./db_bench --benchmarks=fillseq \
        --use_existing_db=0 \
@@ -169,12 +187,14 @@ function run_fillseq {
        --min_level_to_compress=0 \
        --threads=1 \
        --memtablerep=vector \
-       --disable_wal=1 \
+       --disable_wal=$1 \
        --seed=$( date +%s ) \
-       2>&1 | tee -a $output_dir/benchmark_fillseq.v${value_size}.log"
-  echo $cmd | tee $output_dir/benchmark_fillseq.v${value_size}.log
+       2>&1 | tee -a $log_file_name"
+  echo $cmd | tee $log_file_name
   eval $cmd
-  summarize_result $output_dir/benchmark_fillseq.v${value_size}.log fillseq.v${value_size} fillseq
+
+  # The constant "fillseq" which we pass to db_bench is the benchmark name.
+  summarize_result $log_file_name $test_name fillseq
 }
 
 function run_change {
@@ -310,8 +330,10 @@ for job in ${jobs[@]}; do
   start=$(now)
   if [ $job = bulkload ]; then
     run_bulkload
-  elif [ $job = fillseq ]; then
-    run_fillseq
+  elif [ $job = fillseq_disable_wal ]; then
+    run_fillseq 1
+  elif [ $job = fillseq_enable_wal ]; then
+    run_fillseq 0
   elif [ $job = overwrite ]; then
     run_change overwrite
   elif [ $job = updaterandom ]; then
diff --git a/tools/run_flash_bench.sh b/tools/run_flash_bench.sh
index c24b0f5eb..873b2c7ca 100755
--- a/tools/run_flash_bench.sh
+++ b/tools/run_flash_bench.sh
@@ -137,10 +137,17 @@ if [[ $do_setup != 0 ]]; then
   # Test 2a: sequential fill with large values to get peak ingest
   #          adjust NUM_KEYS given the use of larger values
   env $ARGS BLOCK_SIZE=$((1 * M)) VALUE_SIZE=$((32 * K)) NUM_KEYS=$(( num_keys / 64 )) \
-       ./tools/benchmark.sh fillseq
+       ./tools/benchmark.sh fillseq_disable_wal
 
   # Test 2b: sequential fill with the configured value size
-  env $ARGS ./tools/benchmark.sh fillseq
+  env $ARGS ./tools/benchmark.sh fillseq_disable_wal
+
+  # Test 2c: same as 2a, but with WAL being enabled.
+  env $ARGS BLOCK_SIZE=$((1 * M)) VALUE_SIZE=$((32 * K)) NUM_KEYS=$(( num_keys / 64 )) \
+       ./tools/benchmark.sh fillseq_enable_wal
+
+  # Test 2d: same as 2b, but with WAL being enabled.
+  env $ARGS ./tools/benchmark.sh fillseq_enable_wal
 
   # Test 3: single-threaded overwrite
   env $ARGS NUM_THREADS=1 DB_BENCH_NO_SYNC=1 ./tools/benchmark.sh overwrite
@@ -263,9 +270,13 @@ if [[ $skip_low_pri_tests != 1 ]]; then
   grep bulkload $output_dir/report.txt >> $output_dir/report2.txt
 fi
 
-echo fillseq >> $output_dir/report2.txt
+echo fillseq_wal_disabled >> $output_dir/report2.txt
 head -1 $output_dir/report.txt >> $output_dir/report2.txt
-grep fillseq $output_dir/report.txt >> $output_dir/report2.txt
+grep fillseq.wal_disabled $output_dir/report.txt >> $output_dir/report2.txt
+
+echo fillseq_wal_enabled >> $output_dir/report2.txt
+head -1 $output_dir/report.txt >> $output_dir/report2.txt
+grep fillseq.wal_enabled $output_dir/report.txt >> $output_dir/report2.txt
 
 echo overwrite sync=0 >> $output_dir/report2.txt
 head -1 $output_dir/report.txt >> $output_dir/report2.txt