Tiny Container Challenge: Building a 6kB Containerized HTTP Server

Re:Tiny Container Challenge: Building a 6kB Containerized HT... by dividuum on Thursday April 22, 2021 @06:09AM (#26900925)

I was initially a bit skeptical if the page cache would work with all layering docker does. But OverlayFS, perhaps unsurprisingly, does indeed support that: [1] "OverlayFS supports page cache sharing. Multiple containers accessing the same file share a single page cache entry for that file. This makes the overlay and overlay2 drivers efficient with memory and a good option for high-density use cases such as PaaS." TIL

[1] https://docs.docker.com/storage/storagedriver/overlayfs-driv...

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Re:Tiny Container Challenge: Building a 6kB Containerized HT... by Hackbraten on Thursday April 22, 2021 @11:28AM (#26903843)

UPX creates anonymous pages that contain the decompressed payload, right? Those aren’t file-backed pages so how would the filesystem even know those pages exist?

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Re:Tiny Container Challenge: Building a 6kB Containerized HT... by dividuum on Thursday April 22, 2021 @01:19PM (#26905275)

That’s correct and I guess only page deduplication might help in that case. What I meant in my post was just to state that docker can use the page cache despite the massive indirection caused by overlays. I was wondering if that was even possible and it indeed is.

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