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0 pointsmschuster916y ago0 comments

Why? The only overhead you have in Docker is on syscalls (due to permission checks, namespaces, ...), everything else runs at 100% native speed - unlike assisted virtualization (at least IOMMU overhead plus overhead for anything involving the filesystem) or emulated virtualization (obvious overheads here).

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2 comments · 2 top-level

edwintorok6y ago

If both sides of the comparison run inside Docker that is still a valid comparison. With Docker the benchmark should be a bit more reproducible by anyone.

MiroF6y ago

There are serious and undocumented problems in Docker. For instance, I spent multiple days investigating an issue in my tests that eventually I realized was due to accessing memory returned by an `mmap` syscall on a Docker mounted FS causing a SIGBUS, but only some of the time.

That is super dangerous and shook my confidence in Docker.

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