diff options
Diffstat (limited to 'synapse/config/server.py')
| -rw-r--r-- | synapse/config/server.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/synapse/config/server.py b/synapse/config/server.py index 28b4e5f50c..89d61a0503 100644 --- a/synapse/config/server.py +++ b/synapse/config/server.py @@ -1,5 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2014-2016 OpenMarket Ltd +# Copyright 2017 New Vector Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -29,6 +30,7 @@ class ServerConfig(Config): self.user_agent_suffix = config.get("user_agent_suffix") self.use_frozen_dicts = config.get("use_frozen_dicts", False) self.public_baseurl = config.get("public_baseurl") + self.cpu_affinity = config.get("cpu_affinity") # Whether to send federation traffic out in this process. This only # applies to some federation traffic, and so shouldn't be used to @@ -147,6 +149,27 @@ class ServerConfig(Config): # When running as a daemon, the file to store the pid in pid_file: %(pid_file)s + # CPU affinity mask. Setting this restricts the CPUs on which the + # process will be scheduled. It is represented as a bitmask, with the + # lowest order bit corresponding to the first logical CPU and the + # highest order bit corresponding to the last logical CPU. Not all CPUs + # may exist on a given system but a mask may specify more CPUs than are + # present. + # + # For example: + # 0x00000001 is processor #0, + # 0x00000003 is processors #0 and #1, + # 0xFFFFFFFF is all processors (#0 through #31). + # + # Pinning a Python process to a single CPU is desirable, because Python + # is inherently single-threaded due to the GIL, and can suffer a + # 30-40%% slowdown due to cache blow-out and thread context switching + # if the scheduler happens to schedule the underlying threads across + # different cores. See + # https://www.mirantis.com/blog/improve-performance-python-programs-restricting-single-cpu/. + # + # cpu_affinity: 0xFFFFFFFF + # Whether to serve a web client from the HTTP/HTTPS root resource. web_client: True |