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## Problem `no_sync` initially just skipped syncfs on startup (#9677). I'm also interested in flaky tests that time out during pageserver shutdown while flushing l0s, so to eliminate disk throughput as a source of issues there, ## Summary of changes - Drive-by change for test timeouts: add a couple more ::info logs during pageserver startup so it's obvious which part got stuck. - Add a SyncMode enum to configure VirtualFile and respect it in sync_all and sync_data functions - During pageserver startup, set SyncMode according to `no_sync`
Pageserver Benchmarks
How to run
To run all benchmarks:
cargo bench
To run a specific file:
cargo bench --bench bench_layer_map
To run a specific function:
cargo bench --bench bench_layer_map -- real_map_uniform_queries