Zeroing and the semantic gap between host and guest https://peertube.watch/videos/watch/96e6a2c8-3dcb-4c8e-a85d-99a3ea11dbe8 Checkpointing and snapshotting solutions like CRaC or Snapstart become increasingly popular for reducing startup/warmup times. They serialize a warmed-up Java application to disk and allow users to quickly resume their application from that specific state at a later point in time. The smaller the serialized JVM/application image is, the faster it can be restored or transferred to a remote location. This talk is about minimizing the memory footprint of the JVM before a snapshot/checkpoint. Uncommitting unused parts of the address space works well for CRIU but imposes challenges for full KVM snapshots because of the "semantic gap" between the guest and host operating system. We will demonstrate how zeroing and kernel features like init_on_free, Kernel Samepage Merging (KSM) and ballooning can improve the snapshot/restore process and will compare CRIU and Firecracker snapshot sizes. Speaker: Volker Simonis, Track: Free Java devroom, Room: UB5.132, When: Saturday 3 February 2024, 15:50–16:15 (Brussels time), Schedule: FOSDEM 2024 event page, Slides & links Slides, Licence: Creative Commons Attribution 2.0 Belgium (CC BY 2.0 BE) (as stated in the FOSDEM video archive). Attribution: “Zeroing and the semantic gap between host and guest” by Volker Simonis, FOSDEM 2024. Original recording: 2024/ub5132/fosdem-2024-3454-zeroing-and-the-semantic-gap-between-host-and-guest.av1.webm from the FOSDEM video archive. This channel is an unofficial mirror; FOSDEM is a free and non-commercial event organised by the community for the community. Wed, 21 Oct 2026 23:02:59 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.watch Zeroing and the semantic gap between host and guest https://peertube.watch/lazy-static/avatars/3b284627-b75f-409e-ac2e-10f4c2946f43.png https://peertube.watch/videos/watch/96e6a2c8-3dcb-4c8e-a85d-99a3ea11dbe8 All rights reserved, unless otherwise specified in the terms specified at https://peertube.watch/about and potential licenses granted by each content's rightholder.