Page store for the Simgrid model checker

simgrid system computer checkpoint

The first (lower) layer of the per-page snapshot mechanism is a page store: its responsibility is to store immutable shareable reference-counted memory pages independently of the snapshoting logic. Snapshot management and representation, soft-dirty tracking will be handled in an higher layer.

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Per-page shallow snapshots for the SimGrid model checker

simgrid system computer checkpoint

I looked at my options to achieve efficient/cheap snapshots of the simulated application for the Simgrid model checker using copy-on-write. Here I look at another solution to achieve this without using copy-on-write.

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Copy-on-write snapshots for the SimGrid model checker

simgrid system computer checkpoint

The SimGrid model checker explores the graph of possible executions of a simulated distributed application in order to verify safety and liveness properties. The model checker needs to store the state of the application in each node of the execution graph in order to detect cycles. However, saving the whole state of the application at each node of the graph leads to huge memory consumption and in some cases most of the time is spent copying data in order to take the snapshots of the application. We will see how we could solve this problem, using copy-on-write.

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