[Webkit-unassigned] [Bug 262780] New: Web process cache should expire old web processes sooner

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262780

            Bug ID: 262780
           Summary: Web process cache should expire old web processes
                    sooner
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at redhat.com
                CC: cdumez at apple.com, kkinnunen at apple.com

Currently the web process cache has a default 30 minute timeout for expiring old web processes. This is pretty excessive, and it's contributing to user complaints regarding excessive memory use from unused cached web processes. (Yes, the cache should be evicted under memory pressure, but users still don't like seeing applications use huge amounts of RAM.) The use case is: open 20 tabs for https://reddit.com, then close them all and continue using the browser. All those web processes stick around using a whole lot of RAM for up to 30 minutes.

The current web process cache defaults are:

Seconds WebProcessCache::cachedProcessLifetime { 30_min };
Seconds WebProcessCache::clearingDelayAfterApplicationResignsActive { 5_min };
static Seconds cachedProcessSuspensionDelay { 30_s };

I'm thinking the default cachedProcessLifetime should be much smaller, say at most 5 minutes. If you don't visit the same website again for more than 5 minutes, it's surely OK to pay the cost of spinning up a new web process, right?

Hey Chris, would you be OK if we change this for all platforms? I'm thinking Safari users would appreciate a shorter cache lifetime as well.

P.S. More details on how the cache works in bug #219689

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