Maintenance Windows for Sauce Labs
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Dates:
Monday, March 8, 18:39 - 23:30 UTC
What happened:
We were seeing elevated wait times for automated and manual MacOS tests in our US-West-1 data center. Customers may have seen MacOS and iOS Simulator tests taking a long time to start, or failing to start. Windows, Linux and Android tests were unaffected.
Why it happened:
Due to high sustained peak usage combined with intensive CPU operations from a customer application our Mac Cloud CPU performance became degraded.
How we fixed it:
Additional data center caching servers were deployed to improve performance and distribution of application storage. We also implemented throttling of targeted jobs to reduce the CPU load on our US-West Mac Cloud.
What we are doing to prevent it from happening again:
In the future more aggressive throttling will be implemented on a per customer basis to keep the performance of our services within established baselines. A Sev1 issue will be opened with affected customers to work with them to resolve the issue specific to their usage.