# Ansible 2.4.0 (rc4 or rc5) seems significantly slower than Ansible 2.3.2

**URL:** <https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511>\
**Category:** Ansible Project\
**Tags:** fedora\
**Created:** [September 18, 2017, 1:30pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511 "2017-09-18T13:30:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![PhilEv](https://avatars.discourse-cdn.com/v4/letter/p/ee59a6/32.png) [@PhilEv](https://forum.ansible.com/u/PhilEv)\
**Post date:** [September 18, 2017, 1:30pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511/1 "2017-09-18T13:30:37Z")

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Any reasons for a significative slowdown ?

For the playbook used for my early 2.a testing, this almost double the execution time

running:  
time ansible-playbook […]

with the same playbook against the same target system (same configuration file, inventory, same callback plugin code, …)

when running with 2.3.2 (a packged version for Fedora)

ansible-playbook 2.3.2.0  
config file = /home/eveque/.ansible.cfg  
configured module search path = Default w/o overrides  
python version = 2.7.13 (default, Sep 5 2017, 08:53:59) [GCC 7.1.1 20170622 (Red Hat 7.1.1-3)]

=\>

real 0m14.466s  
user 0m3.302s  
sys 0m1.508s

when running with the rc4 (idem or rc5) checkout I got:

ansible-playbook 2.4.0.0 (detached HEAD d25106e387) last updated 2017/09/18 15:12:29 (GMT +200)  
config file = /home/eveque/.ansible.cfg  
configured module search path = [u’/home/eveque/.ansible/plugins/modules’, u’/usr/share/ansible/plugins/modules’]  
ansible python module location = /home/eveque/workspace/ansible/lib/ansible  
executable location = /home/eveque/workspace/ansible/bin/ansible-playbook  
python version = 2.7.13 (default, Sep 5 2017, 08:53:59) [GCC 7.1.1 20170622 (Red Hat 7.1.1-3)]  
Using /home/eveque/.ansible.cfg as config file

=\>

real 0m26.365s  
user 0m5.776s  
sys 0m3.282s

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**Author:** ![Andrew\_Latham](https://avatars.discourse-cdn.com/v4/letter/a/ed8c4c/32.png) [@Andrew\_Latham](https://forum.ansible.com/u/Andrew_Latham)\
**Post date:** [September 18, 2017, 1:40pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511/2 "2017-09-18T13:40:17Z")

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Please see [https://github.com/ansible/ansible/blob/stable-2.4/CHANGELOG.md](https://github.com/ansible/ansible/blob/stable-2.4/CHANGELOG.md) for the changes

I would suggest you check that “pipelining = True” vs the default of False.

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**Author:** ![PhilEv](https://avatars.discourse-cdn.com/v4/letter/p/ee59a6/32.png) [@PhilEv](https://forum.ansible.com/u/PhilEv)\
**Post date:** [September 18, 2017, 2:56pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511/3 "2017-09-18T14:56:05Z")

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Thanks for the suggestion.

Based on previous cli output one can see the config file is /home/eveque/.ansible.cfg for both runs  
and it do have “pipelining = True”.

Also confirmed when in 2.4.0 environment with ansible-config (thanks for pointing ansible-config)

ansible-config dump | grep SSH\_PIPELINING  
ANSIBLE\_SSH\_PIPELINING(/home/eveque/.ansible.cfg) = True

so something else at play here I think

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**Author:** ![system](https://us1.discourse-cdn.com/ansible/original/1X/1882d9a01da5d8996a862359b0913cc568a39b84.svg) [@system](https://forum.ansible.com/u/system)\
**Post date:** [September 18, 2017, 3:00pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511/4 "2017-09-18T15:00:19Z")

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Open a ticket about performance, so we can track and fix any inefficiencies.

One factor is probably inventory, for some cases it will be much  
faster (lots of group/host\_vars are now read on demand) for others it  
is probably a bit slower, as the new plugin system is not as efficient  
as 'everything hardcoded inline'.

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**Author:** ![PhilEv](https://avatars.discourse-cdn.com/v4/letter/p/ee59a6/32.png) [@PhilEv](https://forum.ansible.com/u/PhilEv)\
**Post date:** [September 18, 2017, 3:53pm UTC](https://forum.ansible.com/t/ansible-2-4-0-rc4-or-rc5-seems-significantly-slower-than-ansible-2-3-2/25511/5 "2017-09-18T15:53:04Z")

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see [https://github.com/ansible/ansible/issues/30519](https://github.com/ansible/ansible/issues/30519)