upstream/mercurial-mirror Files · mercurial/cffi/bdiffbuild.py

branchmap: avoid ancestor computations in absence of non-continous branches...

branchmap: avoid ancestor computations in absence of non-continous branches The branchhead computation is one of the more heavy operations for bigger repositories as it has to scan all changesets and potentially involves the expensive computation of the ancestor sets. Redo the computation to handle the common cases directly and use tighter conditions for when the ancestor scan is necessary. Most importantly, avoid it completely if the non-continous branches are processed in one update as seen in the initial computation after a clone. For the Mercurial repository, it gives a small 2-3% performance boost. For the NetBSD test repository, it cuts the time in half. Differential Revision: https://phab.mercurial-scm.org/D9631

Manuel Jacob - - Load All Authors

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      from __future__ import absolute_import

      import cffi

      import os

      ffi = cffi.FFI()

      with open(

          os.path.join(os.path.join(os.path.dirname(__file__), '..'), 'bdiff.c')

      ) as f:

          ffi.set_source(

              "mercurial.cffi._bdiff", f.read(), include_dirs=['mercurial']

          )

      ffi.cdef(

          """

      struct bdiff_line {

          int hash, n, e;

          ssize_t len;

          const char *l;

      };

      struct bdiff_hunk;

      struct bdiff_hunk {

          int a1, a2, b1, b2;

          struct bdiff_hunk *next;

      };

      int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);

      int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,

          struct bdiff_hunk *base);

      void bdiff_freehunks(struct bdiff_hunk *l);

      void free(void*);

      """

      )

      if __name__ == '__main__':

          ffi.compile()

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				from __future__ import absolute_import

				import cffi
				import os

				ffi = cffi.FFI()
				with open(
				os.path.join(os.path.join(os.path.dirname(__file__), '..'), 'bdiff.c')
				) as f:
				ffi.set_source(
				"mercurial.cffi._bdiff", f.read(), include_dirs=['mercurial']
				)
				ffi.cdef(
				"""
				struct bdiff_line {
				int hash, n, e;
				ssize_t len;
				const char *l;
				};

				struct bdiff_hunk;
				struct bdiff_hunk {
				int a1, a2, b1, b2;
				struct bdiff_hunk *next;
				};

				int bdiff_splitlines(const char a, ssize_t len, struct bdiff_line *lr);
				int bdiff_diff(struct bdiff_line a, int an, struct bdiff_line b, int bn,
				struct bdiff_hunk *base);
				void bdiff_freehunks(struct bdiff_hunk *l);
				void free(void*);
				"""
				)

				if __name__ == '__main__':
				ffi.compile()