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What causes high CPU load on agents when cloning repositories?

Clifford Sanders November 12, 2021


if I use the Source Code Checkout task cloning the repository takes up to 9 minutes. Most of the time is spent in these steps

01:43:17 Fetching 'refs/heads/*' from 'ssh://'.
01:43:17 Warning: Permanently added '[]:36431' (RSA) to the list of known hosts.
01:51:55 From ssh://
01:51:55 * [new branch] mybranch

During this time the CPU load of the agent running on an AWS EC2 machine (c4.4xlarge) goes up to 100% using only one of the available 8 cores.

If I use a Script task to execute

git init myproject
cd myproject
git remote add origin ssh://
git fetch

cloning is much faster

14:48:59 Initialized empty Git repository in /root/bamboo-agent-home/xml-data/build-dir/MY-PROJ-JOB1/myproject/.git/
14:48:59 Warning: Permanently added '[]:7999,[]:7999' (RSA) to the list of known hosts.
14:49:47 From ssh://
14:49:47 * [new branch] mybranch

What is causing this high load and how can I make cloning repositories faster?

1 answer

0 votes
Daniel Ebers
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January 8, 2022

Hi @Clifford Sanders

this could be hard to pinpoint from the outside/from Community so I am only able to share some more generic information - the first attempt for diagnosing performance issues could be to follow the troubleshooting guideline.

In case the issue is still current and you have not reviewed the information recorded here, it could give a first clue:


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