cdCon+GitOpsCon 2023

In this work, we study Argo CD scalability, in terms of how many Argo CD Applications can be supported with reasonable performance. For performance, we care about the syncing delay from changes at the upstream git repositories to the resources at the downstream Kubernetes clusters. We identify that, with thousands of Argo CD Applications, CPU easily becomes the performance bottleneck. Naturally, we approach this problem from several angles --- reduce computational requirements, provision more computing power, expect longer syncing delay. In our experiments, we managed to sync 10k Argo CD applications in less than 40 minutes.