[Bug 58805] New: Chrome Embedded Framework CEF Massive Memory usage

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58805

            Bug ID: 58805
           Summary: Chrome Embedded Framework CEF Massive Memory usage
           Product: Wine
           Version: 10.16
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs(a)winehq.org
          Reporter: johnpgoodman(a)gmail.com
      Distribution: ---

Created attachment 79459
  --> http://bugs.winehq.org/attachment.cgi?id=79459
memory usage

I noticed that recent versions of Logos Bible software make much more use of
CEF and so each panel starts up a new process. I'm sure this is true of lots of
other apps too. But the problem is on Mac or Windows CEF is very memory light
but for some reason each process uses about 250mb of ram on wine. I've
investigated this a little and grok suggests that the problem is likely this:

Chromium Embedded Framework (CEF) apps like Logos Bible Software spawn multiple
renderer processes (~1 per UI panel). On Windows/Mac, each uses 20-50MB RAM by
sharing V8 JIT code, Skia graphics caches, and fonts across processes. In Wine
on Linux, unshared per-process duplication inflates this to 250MB/process,
exhausting RAM with 10+ panels (2.5GB+ total). Root causes: Wine's ntdll
doesn't share executable pages; D3D11 re-translates shaders per-process;
emulated sandbox adds overhead.

It recommends a solution:
3 targeted patches to emulate native sharing:  Shared V8 JIT Cache
(ntdll/unixlib.c): Map V8's 128MB executable region to /dev/shm once per
prefix.  
Unified Skia/ANGLE Cache (d3d11/utils.c): Global /tmp/wine-angle-cache for
shader translations.  
CEF Sandbox Bypass (Launch flag + winevdm.c): Skip emulated sandboxing.

And points out that All Wine CEF Apps would be affected e.g. Discord, VSCode,
Steam etc so many 1000s of users.

I haven't a great deal of expertise but I've a good track record of working
with devs to do testing and builds etc to help patches through. I'd be very
grateful for any assistance from a dev with this issue! thanks

-- 
Do not reply to this email, post in Bugzilla using the
above URL to reply.
You are receiving this mail because:
You are watching all bug changes.