diff --git a/benchmarks/benchmark.hpp b/benchmarks/benchmark.hpp
index aec1ba6..c4310ea 100644
--- a/benchmarks/benchmark.hpp
+++ b/benchmarks/benchmark.hpp
@@ -12,7 +12,7 @@
 #include <dml/dml.hpp>
 
 #include "util/barrier.hpp"
-#include "util/statuscode-tostring.hpp"
+#include "util/dml-helper.hpp"
 #include "util/task-data.hpp"
 #include "util/array_utils.h"
 
diff --git a/benchmarks/util/array_utils.h b/benchmarks/util/array_utils.h
index d9f8a85..4604078 100644
--- a/benchmarks/util/array_utils.h
+++ b/benchmarks/util/array_utils.h
@@ -2,6 +2,7 @@
 // author: Andre Berthold
 
 #pragma once
+
 #include <cstdlib>
 #include <ctime>
 #include <cstdint>
diff --git a/benchmarks/util/statuscode-tostring.hpp b/benchmarks/util/statuscode-tostring.hpp
deleted file mode 100644
index 1686fd1..0000000
--- a/benchmarks/util/statuscode-tostring.hpp
+++ /dev/null
@@ -1,26 +0,0 @@
-#pragma once
-
-#include <dml/dml.hpp>
-
-inline const std::string StatusCodeToString(const dml::status_code code) {
-    switch(code) {
-        case dml::status_code::ok: return "ok";
-        case dml::status_code::false_predicate: return "false predicate";
-        case dml::status_code::partial_completion: return "partial completion";
-        case dml::status_code::nullptr_error: return "nullptr error";
-        case dml::status_code::bad_size: return "bad size";
-        case dml::status_code::bad_length: return "bad length";
-        case dml::status_code::inconsistent_size: return "inconsistent size";
-        case dml::status_code::dualcast_bad_padding: return "dualcast bad padding";
-        case dml::status_code::bad_alignment: return "bad alignment";
-        case dml::status_code::buffers_overlapping: return "buffers overlapping";
-        case dml::status_code::delta_delta_empty: return "delta delta empty";
-        case dml::status_code::batch_overflow: return "batch overflow";
-        case dml::status_code::execution_failed: return "execution failed";
-        case dml::status_code::unsupported_operation: return "unsupported operation";
-        case dml::status_code::queue_busy: return "queue busy";
-        case dml::status_code::error: return "unknown error";
-        case dml::status_code::config_error: return "config error";
-        default: return "unhandled error";
-    }
-}
\ No newline at end of file
diff --git a/benchmarks/util/task-data.hpp b/benchmarks/util/task-data.hpp
index 2c770c4..9adf31f 100644
--- a/benchmarks/util/task-data.hpp
+++ b/benchmarks/util/task-data.hpp
@@ -4,8 +4,8 @@
 
 #include "json/single_include/nlohmann/json.hpp"
 
-#include "statuscode-tostring.hpp"
 #include "barrier.hpp"
+#include "dml-helper.hpp"
 
 struct TaskData {
     // thread placement / engine selection
@@ -21,12 +21,9 @@ struct TaskData {
     // thread output
     dml::status_code status;
     // average run duration in microseconds
-    double combined_duration;
-    double submit_duration;
-    double complete_duration;
-    double combined_duration_stdev;
-    double submit_duration_stdev;
-    double complete_duration_stdev;
+    std::vector<double> combined_duration;
+    std::vector<double> submit_duration;
+    std::vector<double> complete_duration;
     // completed iterations
     uint32_t rep_completed;
     // set by execution
@@ -45,9 +42,6 @@ inline void to_json(nlohmann::json& j, const TaskData& a) {
     j["report"]["time"]["completion_avg"] = a.complete_duration;
     j["report"]["time"]["submission_avg"] = a.submit_duration;
     j["report"]["time"]["combined_avg"] = a.combined_duration;
-    j["report"]["time"]["completion_stdev"] = a.complete_duration_stdev;
-    j["report"]["time"]["submission_stdev"] = a.submit_duration_stdev;
-    j["report"]["time"]["combined_stdev"] = a.combined_duration_stdev;
     j["report"]["iterations_completed"] = a.rep_completed;
     j["report"]["status"] = StatusCodeToString(a.status);
 }