/usr/share/pyshared/zope/server/adjustments.py is in python-zope.server 3.8.6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Adjustments are tunable parameters.
"""
import socket
from zope.server import maxsockets
class Adjustments(object):
"""This class contains tunable communication parameters.
You can either change default_adj to adjust parameters for
all sockets, or you can create a new instance of this class,
change its attributes, and pass it to the channel constructors.
"""
# backlog is the argument to pass to socket.listen().
backlog = 1024
# recv_bytes is the argument to pass to socket.recv().
recv_bytes = 8192
# send_bytes is the number of bytes to send to socket.send().
# Multiples of 9000 should avoid partly-filled packets, but don't
# set this larger than the TCP write buffer size. In Linux,
# /proc/sys/net/ipv4/tcp_wmem controls the minimum, default, and
# maximum sizes of TCP write buffers.
send_bytes = 9000
# copy_bytes is the number of bytes to copy from one file to another.
copy_bytes = 65536
# Create a tempfile if the pending output data gets larger
# than outbuf_overflow. With RAM so cheap, this probably
# ought to be set to the 16-32 MB range (circa 2001) for
# good performance with big transfers. The default is
# conservative.
outbuf_overflow = 1050000
# Create a tempfile if the data received gets larger
# than inbuf_overflow.
inbuf_overflow = 525000
# Stop accepting new connections if too many are already active.
connection_limit = maxsockets.max_select_sockets() - 3 # Safe
# Minimum seconds between cleaning up inactive channels.
cleanup_interval = 300
# Maximum seconds to leave an inactive connection open.
channel_timeout = 900
# Boolean: turn off to not log premature client disconnects.
log_socket_errors = 1
# The socket options to set on receiving a connection.
# It is a list of (level, optname, value) tuples.
# TCP_NODELAY is probably good for Zope, since Zope buffers
# data itself.
socket_options = [
(socket.SOL_TCP, socket.TCP_NODELAY, 1),
]
default_adj = Adjustments()
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