comparison mercurial/changelog.py @ 45515:89f0d9f87701

branchmap: add a cache validation cache, avoid expensive re-hash on every use

In a pathological `hg log` case, we end up executing the branchmap validity
checking twice per commit displayed. Or maybe we always do, and I just noticed
because it's really slow in this repo for some reason.

Before:
```
  Time (mean ± σ):      9.816 s ±  0.071 s    [User: 9.435 s, System: 0.392 s]

  Range (min … max):    9.709 s …  9.920 s
```

After:
```
  Time (mean ± σ):      8.671 s ±  0.078 s    [User: 8.309 s, System: 0.392 s]

  Range (min … max):    8.594 s …  8.816 s
```

Differential Revision: https://phab.mercurial-scm.org/D9023

45514:93a0f3ba36bb

        self._realopener = opener
        self._delayed = False
        self._delaybuf = None
        self._divert = False
        self.filteredrevs = frozenset()
        self._copiesstorage = opener.options.get(b'copies-storage')

    def delayupdate(self, tr):
        """delay visibility of index updates to other readers"""

        if not self._delayed:

45515:89f0d9f87701

        self._realopener = opener
        self._delayed = False
        self._delaybuf = None
        self._divert = False
        self._filteredrevs = frozenset()
        self._filteredrevs_hashcache = {}
        self._copiesstorage = opener.options.get(b'copies-storage')

    @property
    def filteredrevs(self):
        return self._filteredrevs

    @filteredrevs.setter
    def filteredrevs(self, val):
        # Ensure all updates go through this function
        assert isinstance(val, frozenset)
        self._filteredrevs = val
        self._filteredrevs_hashcache = {}

    def delayupdate(self, tr):
        """delay visibility of index updates to other readers"""

        if not self._delayed: