revlog: break up compression of large deltas Python's zlib apparently makes an internal copy of strings passed to compress(). To avoid this, compress strings 1M at a time, then join them at the end if the result would be smaller than the original. For initial commits of large but compressible files, this cuts peak memory usage nearly in half.

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#!/bin/sh

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mkdir r1

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cd r1

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hg init

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mkdir a

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echo foo > a/f

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hg add a

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hg ci -m "a/f == foo"

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cd ..

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hg clone r1 r2

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cd r2

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hg mv a b

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echo foo1 > b/f

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hg ci -m" a -> b, b/f == foo1"

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cd ..

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cd r1

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mkdir a/aa

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echo bar > a/aa/g

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hg add a/aa

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hg ci -m "a/aa/g"

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hg pull ../r2

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hg merge

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hg st -C