diff --git a/src/omniperf b/src/omniperf
index 520af84468..c22aaa4e67 100755
--- a/src/omniperf
+++ b/src/omniperf
@@ -456,7 +456,7 @@ def characterize_app(args, VER):
 
     # Manually join each pmc_perf*.csv output
     if args.use_rocscope == False:
-        join_prof(workload_dir, workload_dir + "/pmc_perf.csv")
+        join_prof(workload_dir, args.join_type)
 
 
 ################################################
@@ -685,7 +685,7 @@ def omniperf_profile(args, VER):
         
         # Manually join each pmc_perf*.csv output
         if args.use_rocscope == False:
-            join_prof(workload_dir, workload_dir + "/pmc_perf.csv")
+            join_prof(workload_dir, args.join_type)
 
     # Generate sysinfo
     gen_sysinfo(args.name, workload_dir, args.ipblocks, args.remaining, args.no_roof)
diff --git a/src/parser.py b/src/parser.py
index a18ad5d22b..65b29f12e0 100644
--- a/src/parser.py
+++ b/src/parser.py
@@ -182,6 +182,14 @@ def parse(my_parser):
         required=False,
         help="\t\t\tDispatch ID filtering.",
     )
+    profile_group.add_argument(
+        "--join-type",
+        metavar="",
+        required=False,
+        choices=["kernel", "grid"],
+        default="grid",
+        help="\t\t\tChoose how to join rocprof runs: (DEFAULT: grid)\n\t\t\t   kernel (i.e. By unique kernel name dispatches)\n\t\t\t   grid (i.e. By unique kernel name + grid size dispatches)",
+    )
     profile_group.add_argument(
         "--no-roof",
         required=False,
diff --git a/src/utils/perfagg.py b/src/utils/perfagg.py
index 81537d6261..333498b2c6 100755
--- a/src/utils/perfagg.py
+++ b/src/utils/perfagg.py
@@ -88,15 +88,27 @@ perfmon_config = {
 
 
 # joins disparate runs less dumbly than rocprof
-def join_prof(workload_dir, out):
+def join_prof(workload_dir, join_type, out=None):
+    # Set default output directory if not specified
+    if out == None:
+        out = workload_dir + "/pmc_perf.csv"
     files = glob.glob(workload_dir + "/" + "pmc_perf_*.csv")
     df = None
 
     for i, file in enumerate(files):
         # _df = parse_rocprof_kernels(file)
+
         _df = pd.read_csv(file)
         key = _df.groupby("KernelName").cumcount()
-        _df["key"] = _df.KernelName + " - " + key.astype(str)
+        if join_type == "kernel":
+            _df["key"] = _df.KernelName + " - " + key.astype(str)
+        elif join_type == "grid":
+            _df["key"] = (
+                _df.KernelName + " - " + key.astype(str) + " - " + _df.grd.astype(str)
+            )
+        else:
+            print("ERROR: Unrecognized --join-type")
+            sys.exit(1)
 
         if df is None:
             df = _df