Ubicloud's Burstable VMs: CPU Slicing with cgroups v2
2025-05-02
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Ubicloud, an open-source AWS alternative, introduced burstable VMs to reduce cloud costs. Leveraging Linux cgroups v2, these VMs run on a fraction of shared CPU resources, bursting to higher usage during peak loads. The article details cgroups v2 configuration and usage, including the cpuset and cpu controllers, and management via the virtual filesystem or systemd. Testing showed burstable VMs achieve around a 30% performance boost under light loads, but this is limited by cgroups v2's micro-interval restrictions.
Development
burstable VMs