[Webkit-unassigned] [Bug 221660] New: It is too easy to hit IPC throttling when calling -[WKWebView evaluateJavaScript:completionHandler:]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221660

            Bug ID: 221660
           Summary: It is too easy to hit IPC throttling when calling
                    -[WKWebView evaluateJavaScript:completionHandler:]
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonathan at tumult.com

If you make too many JavaScript calls, you will hit:

2021-02-09 21:30:06.900010-0800 WebKitTester[66085:1768235] [IPC] 0x110c64160 - Connection::dispatchIncomingMessages: IPC throttling was triggered (has 13997 pending incoming messages, will only process 600 before yielding)
2021-02-09 21:30:06.903092-0800 WebKitTester[66085:1768235] [IPC] 0x110c64160 - Connection::dispatchIncomingMessages: first IPC message in queue is WebPageProxy_SetRenderTreeSize
2021-02-09 21:30:06.903403-0800 WebKitTester[66085:1768235] [IPC] 0x110c64160 - Connection::dispatchIncomingMessages: IPC throttling was triggered (has 13470 pending incoming messages, will only process 300 before yielding)
2021-02-09 21:30:06.903421-0800 WebKitTester[66085:1768235] [IPC] 0x110c64160 - Connection::dispatchIncomingMessages: first IPC message in queue is WebPage_RunJavaScriptInFrameInScriptWorldReply

It isn't clear what the problem is, but I had to develop my own concatenation and deferred call system to deal with this.

Apps like Tumult Hype [https://tumult.com/hype/] have deep integration between their data mode and web views.  By limiting total calls, you make development less straight forward for apps like this.

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