Bug 429433

Summary:	Falkon tends to bind large memory usage over time
Product:	[Applications] Falkon	Reporter:	ivan.planinar
Component:	general	Assignee:	David Rosca <nowrep>
Status:	CONFIRMED ---
Severity:	major	CC:	code, grahamperrin, jurajoravec
Priority:	NOR
Version First Reported In:	3.1.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description ivan.planinar 2020-11-21 09:18:33 UTC

SUMMARY

Over time Falkon uses more and more memory, without ever releasing it. Closing the tabs will close QWEProcesses but not make the main program free some memory.

What started with just ~120mb, after hours of usage Falkon is now allocating over 2gb of ram!

STEPS TO REPRODUCE
1. Just work with Falkon for hours without closing it. Check the memory.
2. Notice the main program will never release the memory, no matter how many tabs you close.

OBSERVED RESULT

Memory leak or simply a build up over time. It's possible that Nvidia hardware acceleration makes Falkon use more memory. However, in my findings it's not more than 50-100mb extra ram being used.

EXPECTED RESULT

Memory optimization, releasing RAM allocation. Just as an example, Firefox uses around 250-500mb all the time. Compared to 2.1GB and growing of Falkon, it's WAY above normal.

SOFTWARE/OS VERSIONS

Operating System: Arch Linux
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1
Kernel Version: 5.9.9-arch1-1
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31,4 GiB of RAM
Graphics Processor: GeForce GTX 1060 6GB/PCIe/SSE2

Comment 1 Michael Mounteney 2021-01-02 01:09:29 UTC

I have also observed this.

Comment 2 Juraj 2021-03-09 18:42:07 UTC

This is a known behaviour.
Sadly I do not know the fix, it requires deeper investigation.

Comment 3 Jesse McClure 2021-07-30 21:45:36 UTC

FYI, we're tracking what is likely the same issue here:

https://bbs.archlinux.org/viewtopic.php?id=268398

In that thread you can find a very simple tiny bit of code that should replicate the issue.

I'd be curious too if Falkon users see worse symptoms of this problem on wayland than on X11.