util: increase filechunkiter size to 128k util.filechunkiter has been using a chunk size of 64k for more than 10 years, also in years where Moore's law still was a law. It is probably ok to bump it now and perhaps get a slight win in some cases. Also, largefiles have been using 128k for a long time. Specifying that size multiple times (or forgetting to do it) seems a bit stupid. Decreasing it to 64k also seems unfortunate. Thus, we will set the default chunksize to 128k and use the default everywhere.

--- a/hgext/largefiles/lfutil.py	Wed Oct 12 12:22:18 2016 +0200
+++ b/hgext/largefiles/lfutil.py	Fri Oct 14 01:53:15 2016 +0200
@@ -372,7 +372,7 @@
         return ''
     hasher = hashlib.sha1('')
     with open(file, 'rb') as fd:
-        for data in util.filechunkiter(fd, 128 * 1024):
+        for data in util.filechunkiter(fd):
             hasher.update(data)
     return hasher.hexdigest()