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build(dockerfile): Set GODEBUG=madvdontneed=1.
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Set GODEBUG=madvdontneed=1 to lower Go RSS memory usage.

MADV_DONTNEED is the default behavior in the upcoming Go 1.16:
https://go-review.googlesource.com/c/go/+/267100/
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@danielmai
danielmai committed Nov 23, 2020
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Expand Up @@ -19,4 +19,5 @@ EXPOSE 9080
RUN mkdir /dgraph
WORKDIR /dgraph

ENV GODEBUG=madvdontneed=1
CMD ["dgraph"] # Shows the dgraph version and commands available.

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