cache the hash construction on Guard (#110464)

Summary:
X-link: pytorch/pytorch#110464
Approved by: https://github.com/zou3519, https://github.com/voznesenskym

Reviewed By: PaliC

Differential Revision: D49921897

Pulled By: Chillee

fbshipit-source-id: 3bef469e24debf7880a8f2d2e929364f1dd6cd9b

userbenchmark/dynamo/dynamobench/_dynamo/utils.py

@@ -96,10 +96,14 @@ def tabulate(rows, headers):
         )
 
 
-def dynamo_profiled(func):
+CPROFILE_ENABLED = False
+
+
+def cprofile_wrapper(func):
     @wraps(func)
     def profile_wrapper(*args, **kwargs):
-        global timer_counter
+        global timer_counter, CPROFILE_ENABLED
+        CPROFILE_ENABLED = True
         datafn = (
             func.__name__ + f"{next(timer_counter)}.profile"
         )  # Name the data file sensibly
@@ -181,8 +185,13 @@ def print_time_report():
 # phase_names record an extra record into a separate compilation timing structure,
 # one keyed on frame+name rather than function.
 # The frame is incremented outside of this function, in def increment_frame() above.
+
+
 def dynamo_timed(original_function=None, phase_name=None):
     def dynamo_timed_inner(func):
+        if CPROFILE_ENABLED:
+            return func
+
         @wraps(func)
         def time_wrapper(*args, **kwargs):
             key = func.__qualname__