diff --git a/tinygrad/device.py b/tinygrad/device.py
index d4782120c1..e1777aa02f 100644
--- a/tinygrad/device.py
+++ b/tinygrad/device.py
@@ -310,7 +310,7 @@ if PROFILE:
     for dev in devs: dev.synchronize()
     for dev in devs: dev._at_profile_finalize()
 
-    with open(temp("profile.pkl"), "wb") as f: pickle.dump(Compiled.profile_events, f)
+    with open(fn:=temp("profile.pkl", append_user=True), "wb") as f: pickle.dump(Compiled.profile_events, f)
 
     from tinygrad.ops import launch_viz
-    launch_viz("PROFILE", temp("profile.pkl"))
+    launch_viz("PROFILE", fn)
diff --git a/tinygrad/helpers.py b/tinygrad/helpers.py
index d47f62d7d7..39d50fed8a 100644
--- a/tinygrad/helpers.py
+++ b/tinygrad/helpers.py
@@ -78,7 +78,8 @@ def polyN(x:T, p:list[float]) -> T: return functools.reduce(lambda acc,c: acc*x+
 def to_function_name(s:str): return ''.join([c if c in (string.ascii_letters+string.digits+'_') else f'{ord(c):02X}' for c in ansistrip(s)])
 @functools.lru_cache(maxsize=None)
 def getenv(key:str, default=0): return type(default)(os.getenv(key, default))
-def temp(x:str) -> str: return (pathlib.Path(tempfile.gettempdir()) / x).as_posix()
+def temp(x:str, append_user:bool=False) -> str:
+  return (pathlib.Path(tempfile.gettempdir()) / (f"{x}.{os.getenv('USERNAME', os.getlogin())}" if append_user else x)).as_posix()
 
 class Context(contextlib.ContextDecorator):
   def __init__(self, **kwargs): self.kwargs = kwargs
diff --git a/tinygrad/ops.py b/tinygrad/ops.py
index 639d16819f..74892dbed8 100644
--- a/tinygrad/ops.py
+++ b/tinygrad/ops.py
@@ -815,10 +815,10 @@ if TRACK_MATCH_STATS:
   @atexit.register
   def print_match_stats():
     if TRACK_MATCH_STATS >= 2:
-      with open(fn:=temp("rewrites.pkl"), "wb") as f:
+      with open(fn:=temp("rewrites.pkl", append_user=True), "wb") as f:
         print(f"rewrote {len(tracked_ctxs)} graphs and matched {sum(len(r.matches) for x in tracked_ctxs for r in x)} times, saved to {fn}")
         with Context(PICKLE_BUFFERS=0): pickle.dump((tracked_keys, tracked_ctxs), f)
-    if getenv("VIZ"): launch_viz("VIZ", temp("rewrites.pkl"))
+    if getenv("VIZ"): launch_viz("VIZ", temp("rewrites.pkl", append_user=True))
     if getenv("PRINT_MATCH_STATS", 1):
       ret = [0,0,0.0,0.0]
       for k,v in sorted(list(match_stats.items()), key=lambda x: x[1][2]+x[1][3]):