New Simple Cache Backend

[Gavin Peters (蓋文彼德斯)]

Hi!

A few of us are working on adding a new very simple cache backend to Chrome. It's intended as a baseline for comparing backends, and also as a useful backend on some low-resource systems with bad IO performance, which as it turns out is a lot of Android devices. This is one of the first "alternative" back ends, intended to be used instead of the current desktop blockfile backend.

(Currently there's an in-memory backend, and the desktop blockfile backend, but those backends are both used in different circumstances).

See https://sites.google.com/a/chromium.org/dev/developers/design-documents/network-stack/disk-cache/very-simple-backend for the (rough) design we're following, along with links to the bugs in progress. It's early yet, and so the design is light on details in many areas; those should be filled in as more work completes. The Chrome network stack will be getting regular status updates along with other cache updates.

As part of the work, we're adding more cache benchmarking & perf measurement tools, both for use while developing and for filling in dashboards over time.

- Gavin

[Michael Nordman]

Oh... we might have interests in a new backend like that for uses other than the the HTTP cache.

- Gavin

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