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Long story short, I have a consistent memory leak coming from somewhere. I'm thinking that it's my browser. So I've tried using firejail to limit the memory as follows:

firejail --rlimit-as=8048576000 vivaldi-stable

Which limits the RAM usage (as I understand) to 8GB, which is a huge amount.

And I get this error.

Fatal error in , line 0
Fatal process out of memory: Failed to reserve memory for new V8 Isolate
FailureMessage Object: 0x7ffc6d28e0c0#0 0x557c2240ec09

Now if I increase the --rlimit-as by one more GB, vivaldi boots up fine.

Same thing happens if I try to start chromium process.

Question: why does V8 need to reserve 9GB of memory? Why so much? Is there any way I can lower that?

Edit:
Some more googling, and I stumbled upon this method that works fine: systemd-run --scope --user -p MemoryLimit=1G vivaldi-stable

PS. I'm running Arch linux with 20GB of ram

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    Read man 1 firejail where --rlimit-as refers to the virtual memory. Then read What is virtual memory?
    – Kamil Maciorowski
    Commented Feb 6, 2021 at 21:41
  • ^ that should be the accepted answer.
    – Anton
    Commented Feb 6, 2021 at 21:50

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