bpo-43317: Use io.DEFAULT_BUFFER_SIZE instead of 1024 in gzip CLI (#24645)

rhpvorderman · web-flow · commit 7956ef884965 · 2021-02-26T21:17:51.000+09:00
This improves the performance slightly.
diff --git a/Lib/gzip.py b/Lib/gzip.py
@@ -595,7 +595,7 @@ def main():
                 f = builtins.open(arg, "rb")
                 g = open(arg + ".gz", "wb")
         while True:
-            chunk = f.read(1024)
+            chunk = f.read(io.DEFAULT_BUFFER_SIZE)
             if not chunk:
                 break
             g.write(chunk)
diff --git a/Misc/NEWS.d/next/Library/2021-02-25-09-08-55.bpo-43317.qrOOpB.rst b/Misc/NEWS.d/next/Library/2021-02-25-09-08-55.bpo-43317.qrOOpB.rst
@@ -0,0 +1,3 @@
+Set the chunk size for the ``gzip`` module main function to
+io.DEFAULT_BUFFER_SIZE. This is slightly faster than the 1024 bytes constant
+that was used previously.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	+Set the chunk size for the ``gzip`` module main function to
	`2`	`+io.DEFAULT_BUFFER_SIZE. This is slightly faster than the 1024 bytes constant`
	`3`	`+that was used previously.`