diff options
| author | Brian Harring <ferringb@chromium.org> | 2011-10-14 02:40:00 -0700 |
|---|---|---|
| committer | Zac Medico <zmedico@gentoo.org> | 2011-10-14 16:50:20 -0700 |
| commit | 1e8870bd45a4e2a9c43e7f112701c6ae84b0fd56 (patch) | |
| tree | 7111ded6176c5a8f4a2b5a39bad04b2f560608ea /pym/portage/cache | |
| parent | 2ed1cb53cc4158af08c22d466b15b9a9a7767212 (diff) | |
| download | portage-1e8870bd45a4e2a9c43e7f112701c6ae84b0fd56.tar.gz portage-1e8870bd45a4e2a9c43e7f112701c6ae84b0fd56.tar.bz2 portage-1e8870bd45a4e2a9c43e7f112701c6ae84b0fd56.zip | |
layout.conf: add git friendly pregenerated cache format
Enabled via cache-format = md5-dict
This format is essentially just flat_hash, using md5 rather than mtime,
and dropping the path component from _eclasses_ entries.
From a speed standpoint, the md5 overhead is ~16% in comparison to mtime,
timed on a modern sandybridge; specifically, validating 29k nodes takes
~8.8s for flat_md5, while the pms norm is ~7.7s.
That said, the cache is /usable/ in places PMS is not; in those cases,
it can definitely be a win since even if the cache is partially old,
it's better than regenerating everything from scratch.
(cherry picked from commit 95ddf97e2f7e7d3f6a072604b2df5f77e9298558)
Change-Id: Ic3561369b7a8be7f86480f339ab1686fddea6dff
Diffstat (limited to 'pym/portage/cache')
| -rw-r--r-- | pym/portage/cache/flat_hash.py | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/pym/portage/cache/flat_hash.py b/pym/portage/cache/flat_hash.py index b6bc0744e..2eae9f634 100644 --- a/pym/portage/cache/flat_hash.py +++ b/pym/portage/cache/flat_hash.py @@ -31,7 +31,7 @@ class database(fs_template.FsBased): self.label.lstrip(os.path.sep).rstrip(os.path.sep)) write_keys = set(self._known_keys) write_keys.add("_eclasses_") - write_keys.add("_mtime_") + write_keys.add("_%s_" % (self.validation_chf,)) self._write_keys = sorted(write_keys) if not self.readonly and not os.path.exists(self.location): self._ensure_dirs() @@ -69,7 +69,6 @@ class database(fs_template.FsBased): raise cache_errors.CacheCorruption(cpv, e) def _setitem(self, cpv, values): -# import pdb;pdb.set_trace() s = cpv.rfind("/") fp = os.path.join(self.location,cpv[:s],".update.%i.%s" % (os.getpid(), cpv[s+1:])) try: @@ -153,3 +152,9 @@ class database(fs_template.FsBased): dirs.append((depth+1, p)) continue yield p[len_base+1:] + + +class md5_database(database): + + validation_chf = 'md5' + store_eclass_paths = False |