Using 24+Gb of virtual memory on Firefox/Ubuntu 20.04

[acostaja]

Prerequisites

• I verified that this is not a filter issue
  • Filter issues MUST be reported at filter issue tracker
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uBlockOrigin
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
• I tried to reproduce the issue when...
  • uBlock Origin is the only extension
  • uBlock Origin with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uBlock Origin
• I checked the documentation to understand that the issue I report is not a normal behavior

Description

[Description of the bug or feature]

A specific URL where the issue occurs

[A specific URL is MANDATORY for issue happening on a web page, even if it happens "everywhere"]

Steps to Reproduce

1. [First Step]
2. [Second Step]
3. [and so on...]

Expected behavior:

[What you expected to happen]

Actual behavior:

[What actually happened]

Your environment

• uBlock Origin version:
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• Operating System and version:

[acostaja]

using 24GB of virtual ram, if not an issue its an horrific code

[uBlock-user]

Speculated performance issues will be marked as invalid and closed if they do not come with actual profiling data from Firefox Profiler/Chromium Profiler + fully substantiated analysis supporting the claim.

[gorhill]

Duplicate of #994 (comment).

Virtual memory usage is not physical memory usage, it's just addressable space reserved by an application. Typically on a 64-bit OS, you will have something around 256 TB (Terabytes) of addressable virtual memory, so 26 GB / 256 TB = 0.01% of addressable, non-physical memory.

It's just a side effect of uBO using WASM modules, and is completely inconsequential.

If for completely irrational reasons this virtual memory figure still bothers you, you can set advanced setting disableWebAssembly to true, at the cost of rendering uBO less performant and with nothing gained in return.