From: Ruben Vorderman <r.h.p.vorderman@lumc.nl>
Date: Fri, 26 Feb 2021 12:17:51 +0000 (+0100)
Subject: bpo-43317: Use io.DEFAULT_BUFFER_SIZE instead of 1024 in gzip CLI (#24645)
X-Git-Tag: v3.10.0a6~23
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7956ef884965ac6f9f7f2a27b835ea80e471c886;p=thirdparty%2FPython%2Fcpython.git

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

This improves the performance slightly.
---

diff --git a/Lib/gzip.py b/Lib/gzip.py
index ee0cbed8f50d..136915725ab4 100644
--- 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
new file mode 100644
index 000000000000..01ff48ad90d6
--- /dev/null
+++ 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.