Pinterest Engineers Eliminate CPU Zombies to Resolve Production Bottlenecks

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Posted on Thu May 14 2026 | 3:30 pm

Pinterest identified and resolved CPU starvation issues that affected machine learning training jobs on its Kubernetes-based platform, PinCompute. The engineers traced the problem to an unused Amazon ECS agent, which caused memory cgroup leaks. By disabling the agent, they stabilised performance. This case illustrates the importance of understanding system defaults for effective troubleshooting.

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