diff --git a/benchmarks/mergesort/common.ml b/benchmarks/mergesort/common.ml
new file mode 100644
index 0000000000..0a367455ce
--- /dev/null
+++ b/benchmarks/mergesort/common.ml
@@ -0,0 +1,131 @@
+ module T = Domainslib.Task
+module A = Array
+module AS = CCArray_slice
+
+type point3d = float * float * float
+
+let print_point3d (x,y,z) =
+  print_string ("(" ^ Float.to_string x ^ ", " ^ Float.to_string y ^ ", " ^ Float.to_string z ^ ")")
+
+let compare_point3d (axis : int) ((x1,y1,z1) : point3d) ((x2,y2,z2) : point3d) : int =
+  if axis == 0
+  then Float.compare x1 x2
+  else if axis == 1
+  then Float.compare y1 y2
+  else Float.compare z1 z2
+
+let dist_point3d ((x1,y1,z1) : point3d) ((x2,y2,z2) : point3d) : float =
+  let (d1, d2, d3) = (x1 -. x2, y1 -. y2, z1 -. z2) in
+  (d1 *. d1) +. (d2 *. d2) +. (d3 *. d3)
+
+let min_point3d ((x1,y1,z1) : point3d) ((x2,y2,z2) : point3d) : point3d =
+  ((Float.min x1 x2),  (Float.min y1 y2), (Float.min z1 z2))
+
+let max_point3d ((x1,y1,z1) : point3d) ((x2,y2,z2) : point3d) : point3d =
+  ((Float.max x1 x2),  (Float.max y1 y2), (Float.max z1 z2))
+
+let coord (i : int) ((x,y,z) : point3d) =
+  match i with
+    0 -> x
+  | 1 -> y
+  | 2 -> z
+  | _ -> z
+
+type point2d = float * float
+
+let compare_point2d (axis : int) ((x1,y1) : point2d) ((x2,y2) : point2d) : int =
+  if axis == 0
+  then Float.compare x1 x2
+  else Float.compare y2 y2
+
+let dist_point2d ((x1,y1) : point2d) ((x2,y2) : point2d) : float =
+  let (d1, d2) = (x1 -. x2, y1 -. y2) in
+  (d1 *. d1) +. (d2 *. d2)
+
+let min_point2d ((x1,y1) : point2d) ((x2,y2) : point2d) : point2d =
+  ((Float.min x1 x2),  (Float.min y1 y2))
+
+let max_point2d ((x1,y1) : point2d) ((x2,y2) : point2d) : point2d =
+  ((Float.max x1 x2),  (Float.max y1 y2))
+
+
+(* https://stackoverflow.com/questions/5774934 *)
+let read_file (filename : string) : string list =
+  let lines = ref [] in
+  let chan = open_in filename in
+  try
+    while true; do
+      lines := input_line chan :: !lines
+    done; !lines
+  with End_of_file ->
+    close_in chan;
+    List.rev !lines ;;
+
+(* A.init n (fun i -> let line = List.nth lines i in
+ *                    if (String.length line) == 0
+ *                    then (0.01, 0.01, 0.01)
+ *                    else
+ *                      let words = String.split_on_char ' ' line in
+ *                      let a = Float.of_string (List.nth words 0) in
+ *                      let b = Float.of_string (List.nth words 1) in
+ *                      let c = Float.of_string (List.nth words 2) in
+ *                      (a, b, c))
+ *)
+
+let read3DArrayFile (fp : string) : point3d array =
+  let lines = read_file fp in
+  let n = List.length lines in
+  let _ = print_endline ("length: " ^ string_of_int n ^ "\n") in
+  let pool = T.setup_pool ~num_domains:48 in
+  let result = A.make n (0.01, 0.01, 0.01) in
+  let _ = T.parallel_for ~start:0 ~finish:(n-1)
+            ~body:(fun i -> let line = List.nth lines i in
+                            if (String.length line) == 0
+                            then ()
+                            else
+                              let words = String.split_on_char ' ' line in
+                              let a = Float.of_string (List.nth words 0) in
+                              let b = Float.of_string (List.nth words 1) in
+                              let c = Float.of_string (List.nth words 2) in
+                              A.set result i (a, b, c);
+                              ())
+            pool in
+  let _ = T.teardown_pool pool in
+  result
+
+
+let read2DArrayFile (fp : string) : point2d array =
+  let lines = read_file fp in
+  let n = List.length lines in
+  let pool = T.setup_pool ~num_domains:48 in
+  let result = A.make n (0.01, 0.01) in
+  let _ = T.parallel_for ~start:0 ~finish:(n-1)
+            ~body:(fun i -> let line = List.nth lines i in
+                            if (String.length line) == 0
+                            then ()
+                            else
+                              let words = String.split_on_char ' ' line in
+                              let a = Float.of_string (List.nth words 0) in
+                              let b = Float.of_string (List.nth words 1) in
+                              A.set result i (a, b);
+                              ())
+            pool in
+  let _ = T.teardown_pool pool in
+  result
+
+let get_rand (n : int) : int =
+  let t = Unix.gettimeofday () in
+  let i = Float.round t in
+  (Float.hash i) mod n
+
+let filter_array (f : ('a -> bool)) (arr : 'a array) : 'a array =
+  let module A = Array in
+  A.of_list (List.filter f (A.to_list arr))
+
+let print_array f arr =
+  let _ = A.iter (fun x -> print_string (f x ^ " ")) arr in
+  print_endline "\n"
+
+let print_slice f arr =
+  let _ = AS.iter (fun x -> print_string (f x ^ " ")) arr in
+  print_endline "\n"
diff --git a/benchmarks/mergesort/dune b/benchmarks/mergesort/dune
new file mode 100644
index 0000000000..7e286a5f91
--- /dev/null
+++ b/benchmarks/mergesort/dune
@@ -0,0 +1,15 @@
+(executable
+ (name mergesort)
+ (modules mergesort)
+ (modes native)
+ (libraries domainslib containers))
+
+ (executable
+  (name common)
+  (modules common)
+  (modes native)
+  (libraries domainslib containers))
+
+(alias 
+  (name multibench_parallel)
+  (deps mergesort.exe common.exe))
diff --git a/benchmarks/mergesort/mergesort.ml b/benchmarks/mergesort/mergesort.ml
new file mode 100644
index 0000000000..29101edd84
--- /dev/null
+++ b/benchmarks/mergesort/mergesort.ml
@@ -0,0 +1,169 @@
+(* similar to Maple's mergesort: https://github.com/MPLLang/mpl/blob/master/examples/lib/Mergesort.sml  *)
+
+open Common
+module A = Array
+module T = Domainslib.Task
+module AS = CCArray_slice
+
+let goto_seqmerge = 4096
+let goto_quicksort = 8192
+
+let rec binary_search' (lo : int) (hi :int) (f : 'a -> 'a -> int) (s : 'a AS.t) (x : 'a) : int =
+  let n = hi - lo in
+  if n == 0
+  then lo
+  else let mid = lo + (n / 2) in
+       let pivot = AS.get s mid in
+       let cmp = f x pivot in
+       if cmp < 0
+       then binary_search' lo mid f s x
+       else if cmp > 0
+       then binary_search' (mid+1) hi f s x
+       else mid
+
+let binary_search (f : 'a -> 'a -> int) (s : 'a AS.t) (x : 'a) : int =
+  binary_search' 0 (AS.length s) f s x
+
+let write_loop_seq (idx : int) (offset : int) (end_idx : int) (from : 'a AS.t) (to0 : 'a AS.t) : 'a AS.t =
+  for i = idx to (end_idx-1) do
+    AS.set to0 (i+offset) (AS.get from i)
+  done;
+  to0
+
+let write_loop pool (idx : int) (offset : int) (end_idx : int) (from : 'a AS.t) (to0 : 'a AS.t) :'a AS.t =
+  T.parallel_for ~start:idx ~finish:(end_idx-1)
+    ~body:(fun i -> AS.set to0 (i+offset) (AS.get from i))
+    pool;
+  to0
+
+(* i1 index into s1
+ * i2 index into s2
+ * j index into output *)
+let rec write_merge_seq_loop (i1 : int) (i2 : int) (j : int) (n1 : int) (n2 : int) (f : 'a -> 'a -> int) (s1 : 'a AS.t) (s2 : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  if i1 == n1
+  then let tmp1 = AS.sub s2 i2 (n2-i2) in
+       let t2 = write_loop_seq 0 j (n2-i2) tmp1 t in
+       t2
+  else if i2 == n2
+  then let tmp1 = AS.sub s1 i1 (n1-i1) in
+       let t1 = write_loop_seq 0 j (n1-i1) tmp1 t in
+       t1
+  else let x1 = AS.get s1 i1 in
+       let x2 = AS.get s2 i2 in
+       if (f x1 x2) < 0
+       then let _ = AS.set t j x1 in
+            let res = write_merge_seq_loop (i1+1) i2 (j+1) n1 n2 f s1 s2 t in
+            res
+       else let _ = AS.set t j x2 in
+            let res = write_merge_seq_loop i1 (i2+1) (j+1) n1 n2 f s1 s2 t in
+            res
+
+let write_merge_seq (f : 'a -> 'a -> int) (s1 : 'a AS.t) (s2 : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  let n1 = AS.length s1 in
+  let n2 = AS.length s2 in
+  let _ = write_merge_seq_loop 0 0 0 n1 n2 f s1 s2 t in
+  t
+
+let rec write_merge pool (f : 'a -> 'a -> int) (s1 : 'a AS.t) (s2 : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  if AS.length t < goto_seqmerge
+  then write_merge_seq f s1 s2 t
+  else
+    let n1 = AS.length s1 in
+    let n2 = AS.length s2 in
+    if n1 == 0
+    then write_loop pool 0 0 n2 s2 t
+    else let mid1 = n1 / 2 in
+         let pivot = AS.get s1 mid1 in
+         let mid2 = binary_search f s2 pivot in
+         let l1 = AS.sub s1 0 mid1 in
+         let r1 = AS.sub s1 (mid1+1) (n1 - (mid1+1)) in
+         let l2 = AS.sub s2 0 mid2 in
+         let r2 = AS.sub s2 mid2 (n2-mid2) in
+         let _ = AS.set t (mid1+mid2) pivot in
+         let len_t = AS.length t in
+         let tl = AS.sub t 0 (mid1+mid2) in
+         let tr = AS.sub t (mid1+mid2+1) (len_t - (mid1+mid2+1)) in
+         let tl1_f = T.async pool (fun _ -> write_merge pool f l1 l2 tl) in
+         let tr1 = write_merge pool f r1 r2 tr in
+         let tl1 = T.await pool tl1_f in
+         t
+
+let rec write_sort1 pool (f : 'a -> 'a -> int) (s : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  let len = AS.length s in
+  if len < goto_quicksort
+  then (Qsort.sortInPlace f s;
+        s)
+  else
+    let half = len / 2 in
+    let (sl, sr) = (AS.sub s 0 half, AS.sub s half (len-half)) in
+    let (tl, tr) = (AS.sub t 0 half, AS.sub t half (len-half)) in
+    let tl1_f = T.async pool (fun _ -> write_sort2 pool f sl tl) in
+    let tr1 = write_sort2 pool f sr tr in
+    let tl1 = T.await pool tl1_f in
+    let res = write_merge pool f tl1 tr1 s in
+    (* let res = write_merge_seq f tl1 tr1 s in *)
+    res
+
+and write_sort1_seq (f : 'a -> 'a -> int) (s : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  let len = AS.length s in
+  if len < goto_quicksort
+  then (Qsort.sortInPlace f s;
+        s)
+  else
+    let half = len / 2 in
+    let (sl, sr) = (AS.sub s 0 half, AS.sub s half (len-half)) in
+    let (tl, tr) = (AS.sub t 0 half, AS.sub t half (len-half)) in
+    let tl1 = write_sort2_seq f sl tl in
+    let tr1 = write_sort2_seq f sr tr in
+    let res = write_merge_seq f tl1 tr1 s in
+    res
+
+and write_sort2 pool (f : 'a -> 'a -> int) (s : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  let len = AS.length s in
+  if len < goto_quicksort
+  then
+    let t1 = write_loop pool 0 0 len s t in
+    Qsort.sortInPlace f t1;
+    t1
+  else
+    let half = len / 2 in
+    let (sl, sr) = (AS.sub s 0 half, AS.sub s half (len-half)) in
+    let (tl, tr) = (AS.sub t 0 half, AS.sub t half (len-half)) in
+    let sl1_f = T.async pool (fun _ -> write_sort1 pool f sl tl) in
+    let sr1 = write_sort1 pool f sr tr in
+    let sl1 = T.await pool sl1_f in
+    let res = write_merge pool f sl1 sr1 t in
+    (* let res = write_merge_seq f sl1 sr1 t in *)
+    res
+
+and write_sort2_seq (f : 'a -> 'a -> int) (s : 'a AS.t) (t : 'a AS.t) : 'a AS.t =
+  let len = AS.length s in
+  if len < goto_quicksort
+  then
+    let t1 = write_loop_seq 0 0 len s t in
+    (Qsort.sortInPlace f t1;
+     t1)
+  else
+    let half = len / 2 in
+    let (sl, sr) = (AS.sub s 0 half, AS.sub s half (len-half)) in
+    let (tl, tr) = (AS.sub t 0 half, AS.sub t half (len-half)) in
+    let sl1 = write_sort1_seq f sl tl in
+    let sr1 = write_sort1_seq f sr tr in
+    let res = write_merge_seq f sl1 sr1 t in
+    res
+
+let mergesort pool (f : 'a -> 'a -> int) (vec : 'a array) : 'a array =
+  let vec2 = A.copy vec in
+  let s = AS.full vec2 in
+  let t = AS.full (A.make (A.length vec2) (A.get vec2 0)) in
+  let s1 = write_sort1 pool f s t in
+  AS.underlying s1
+
+let mergesort_seq (f : 'a -> 'a -> int) (vec : 'a array) : 'a array =
+  let vec2 = A.copy vec in
+  let s = AS.full vec2 in
+  let t = AS.full (A.make (A.length vec2) (A.get vec2 0)) in
+  (* Qsort.sortInPlace f s;
+   * AS.underlying s *)
+  let s1 = write_sort1_seq f s t in
+  AS.underlying s1
\ No newline at end of file
diff --git a/multicore_parallel_run_config.json b/multicore_parallel_run_config.json
index 9b77953c50..254c439116 100644
--- a/multicore_parallel_run_config.json
+++ b/multicore_parallel_run_config.json
@@ -710,6 +710,23 @@
           "params": "100000"
         }
       ]
+    },
+    {
+      "executable": "benchmarks/multicore-numerical/mergesort_multicore.exe",
+      "name": "mergesort_multicore",
+      "tags": ["run_in_ci", "macro_bench", "my_bench" ],
+      "runs": [
+        { "params": "1024", "paramwrapper": "taskset --cpu-list 2-13" }
+      ]
+    },
+    {
+      "executable": "benchmarks/mergesort/mergesort.exe",
+      "name": "mergesort",
+      "tags": ["1s_10s", "macro_bench", "my_bench"],
+      
+      "runs": [
+        { "params": "16", "paramwrapper": "taskset --cpu-list 2-13" }
+      ]  
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/run_config.json b/run_config.json
index f69838778c..2544472a4f 100644
--- a/run_config.json
+++ b/run_config.json
@@ -2,19 +2,19 @@
   "wrappers": [
     {
       "name": "orun",
-      "command": "orun -o %{output} -- taskset --cpu-list 5 %{command}"
+      "command": "orun -o %{output} -- taskset --cpu-list 1 %{command}"
     },
     {
       "name": "perfstat",
-      "command": "perf stat -o %{output} -- taskset --cpu-list 5 %{command}"
+      "command": "perf stat -o %{output} -- taskset --cpu-list 1 %{command}"
     },
     {
       "name": "pausetimes_trunk",
-      "command": "bash pausetimes_trunk %{output} taskset --cpu-list 5 %{command}"
+      "command": "bash pausetimes_trunk %{output} taskset --cpu-list 1 %{command}"
     },
     {
       "name": "pausetimes_multicore",
-      "command": "bash pausetimes_multicore %{output} taskset --cpu-list 5 %{command}"
+      "command": "bash pausetimes_multicore %{output} taskset --cpu-list 1 %{command}"
     }
   ],
   "benchmarks": [
@@ -91,8 +91,8 @@
       "name": "test_decompress",
       "tags": [
        	"1s_10s",
-       	"macro_bench",
-        "run_in_ci"
+       	"macro_bench"
+         
       ],
       "runs": [
         {
@@ -105,8 +105,8 @@
       "name": "yojson_ydump",
       "tags": [
         "lt_1s",
-        "macro_bench",
-        "run_in_ci"
+        "macro_bench"
+         
       ],
       "runs": [
         {
@@ -146,8 +146,8 @@
       "name": "thread_ring_lwt_mvar",
       "tags": [
         "1s_10s",
-        "macro_bench",
-        "run_in_ci"
+        "macro_bench"
+        
       ],
       "runs": [
         {
@@ -331,9 +331,11 @@
     {
       "executable": "benchmarks/benchmarksgame/knucleotide3.exe",
       "name": "knucleotide3",
+      
       "tags": [
         "10s_100s",
         "macro_bench"
+         
       ],
       "runs": [
         {
@@ -359,8 +361,8 @@
       "name": "revcomp2",
       "tags": [
         "1s_10s",
-        "macro_bench",
-        "run_in_ci"
+        "macro_bench"
+         
       ],
       "runs": [
         {
@@ -492,6 +494,7 @@
       "tags": [
         "10s_100s",
         "macro_bench"
+      
       ],
       "runs": [
         {
@@ -632,8 +635,8 @@
       "name": "zarith_pi",
       "tags": [
         "1s_10s",
-        "macro_bench",
-        "run_in_ci"
+        "macro_bench"
+         
       ],
       "runs": [
         {
@@ -670,8 +673,8 @@
       "name": "menhir",
       "tags": [
         "1s_10s",
-        "macro_bench",
-        "run_in_ci"
+        "macro_bench"
+         
       ],
       "runs": [
         {
@@ -1517,9 +1520,10 @@
       ],
       "runs": [
         {
-          "params": ""
+          "params": "200"
         }
       ]
     }
+    
   ]
 }