From 5cb09b0c8a655a2a893593579a02ddb0919879e6 Mon Sep 17 00:00:00 2001
From: Ruben Vorderman <r.h.p.vorderman@lumc.nl>
Date: Thu, 25 Feb 2021 09:00:22 +0100
Subject: [PATCH 1/2] Use io.DEFAULT_BUFFER_SIZE instead of arbitrary number in
 gzip module

This improves the performance slightly, while also using a constant that is shared across the python code base.
---
 Lib/gzip.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/gzip.py b/Lib/gzip.py
index e422773b3edfb7..ba7b7ee140a53f 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -596,7 +596,7 @@ 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)

From ebeacbfbed9322e62fb36feaac00daff309f0229 Mon Sep 17 00:00:00 2001
From: Ruben Vorderman <r.h.p.vorderman@lumc.nl>
Date: Thu, 25 Feb 2021 09:09:05 +0100
Subject: [PATCH 2/2] Add news entry

---
 .../next/Library/2021-02-25-09-08-55.bpo-43317.qrOOpB.rst      | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2021-02-25-09-08-55.bpo-43317.qrOOpB.rst

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 00000000000000..01ff48ad90d6b6
--- /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.