Mercurial > hg
view tests/test-diff-hashes.out @ 5451:0a43875677b1
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.
| author | Matt Mackall <mpm@selenic.com> |
|---|---|
| date | Thu, 11 Oct 2007 00:46:54 -0500 |
| parents | 2065789f6a3e |
| children | c2d0ed7f4af8 |
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quiet: --- a/foo Mon Jan 12 13:46:40 1970 +0000 +++ b/foo Mon Jan 12 13:46:41 1970 +0000 @@ -1,1 +1,1 @@ bar -bar +foobar normal: diff -r 74de3f1392e2 -r b8b5f023a6ad foo --- a/foo Mon Jan 12 13:46:40 1970 +0000 +++ b/foo Mon Jan 12 13:46:41 1970 +0000 @@ -1,1 +1,1 @@ bar -bar +foobar verbose: diff -r 74de3f1392e2 -r b8b5f023a6ad foo --- a/foo Mon Jan 12 13:46:40 1970 +0000 +++ b/foo Mon Jan 12 13:46:41 1970 +0000 @@ -1,1 +1,1 @@ bar -bar +foobar debug: diff -r 74de3f1392e2d67856fb155963441f2610494e1a -r b8b5f023a6ad77fc378bd95cf3fa00cd1414d107 foo --- a/foo Mon Jan 12 13:46:40 1970 +0000 +++ b/foo Mon Jan 12 13:46:41 1970 +0000 @@ -1,1 +1,1 @@ bar -bar +foobar