Memory consumption issue when processing images

[Kosadchiy]

Hi,

Bug report
I faced with a problem that application crashes due to high memory consuming trying to resize multiple images when spawning goroutines. A docker container exits with code 139.
I spawn goroutine for each Image.Process method call. The problem does not reproduce in a single thread without goroutines.
Also I noticed that it depends on how many cache memory seted via VipsCacheSetMaxMem. If the value is 0 application crashes almost instantly while if I set VipsCacheSetMaxMem(1000) it process several images before error.

Environment
(please complete the following information)

• OS: Alpine 3.14, Ubuntu 22.04
• Vips: 8.15.1
• bimg: 1.1.9

Additional context
Cant reproduce it on MacOS. The problem exists in Alpine or Ubuntu based docker containers.

Please let me know what other information I can provide.

Thanks!

[luhuaei]

I have the same issue. I doubt it is caused by CGO in goroutines memory isn't being freed.

[Winens]

Im not sure but, once i watched a video about what happends when goroutines are in low memory. It causes the app to crash. Maybe the issue here is not about CGO at all? How much memory did u even give? Looks like its not enough memory.

[Winens]

Also you said you give VipsCacheSetMaxMem, but did you give that much memory to the docker container?