Add timing of sconsign write if --debug

A line is now emitted showing sconsign sync time if --debug=time

Some calls to time.time replaced with time.perf_counter, where the
objective was to time sections of code (i.e. where there wasn't
an actual need to get time-since-epoch) - Python recommends this
as getting the best-available timer.

Signed-off-by: Mats Wichmann <mats@linux.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/SCons/SConsign.py b/SCons/SConsign.py
index 95b8096..c488ef9 100644
--- a/SCons/SConsign.py
+++ b/SCons/SConsign.py
@@ -27,11 +27,12 @@ import SCons.compat
 
 import os
 import pickle
+import time
 
 import SCons.dblite
 import SCons.Warnings
-
 from SCons.compat import PICKLE_PROTOCOL
+from SCons.Util import print_time
 
 
 def corrupt_dblite_warning(filename):
@@ -100,6 +101,10 @@ normcase = os.path.normcase
 
 def write():
     global sig_files
+
+    if print_time():
+        time1 = time.perf_counter()
+
     for sig_file in sig_files:
         sig_file.write(sync=0)
     for db in DB_sync_list:
@@ -116,6 +121,10 @@ def write():
         else:
             closemethod()
 
+    if print_time():
+        time2 = time.perf_counter()
+        print('Total SConsign sync time: %f seconds' % (time2 - time1))
+
 
 class SConsignEntry:
     """