From 4a063b750f107fccce9549764775d5bfb407c501 Mon Sep 17 00:00:00 2001
From: Pradyun Gedam <pradyunsg@gmail.com>
Date: Thu, 7 May 2020 23:57:17 +0530
Subject: [PATCH] Merge pull request #8167 from
 pradyunsg/drop-list-parallelization

---
 news/8167.removal                  |  1 +
 src/pip/_internal/commands/list.py | 12 +-----------
 2 files changed, 2 insertions(+), 11 deletions(-)
 create mode 100644 news/8167.removal

diff --git a/news/8167.removal b/news/8167.removal
new file mode 100644
index 00000000000..d719377eb26
--- /dev/null
+++ b/news/8167.removal
@@ -0,0 +1 @@
+Drop parallelization from ``pip list --outdated``.
diff --git a/src/pip/_internal/commands/list.py b/src/pip/_internal/commands/list.py
index cf3be7eb459..2aa3075b1b7 100644
--- a/src/pip/_internal/commands/list.py
+++ b/src/pip/_internal/commands/list.py
@@ -5,10 +5,8 @@
 
 import json
 import logging
-from multiprocessing.dummy import Pool
 
 from pip._vendor import six
-from pip._vendor.requests.adapters import DEFAULT_POOLSIZE
 
 from pip._internal.cli import cmdoptions
 from pip._internal.cli.req_command import IndexGroupCommand
@@ -210,18 +208,10 @@ def latest_info(dist):
                 dist.latest_filetype = typ
                 return dist
 
-            # This is done for 2x speed up of requests to pypi.org
-            # so that "real time" of this function
-            # is almost equal to "user time"
-            pool = Pool(DEFAULT_POOLSIZE)
-
-            for dist in pool.imap_unordered(latest_info, packages):
+            for dist in map(latest_info, packages):
                 if dist is not None:
                     yield dist
 
-            pool.close()
-            pool.join()
-
     def output_package_listing(self, packages, options):
         packages = sorted(
             packages,