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bitbake: cache: Only write files if we have data

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By writing the cache files only if there is data to write, we can save a
bit of time.

(Bitbake rev: abeff1f80bb1c690b92d535d472dff9df7a56067)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
2023-01-21 19:29:17 +00:00
parent ae1da8b75c
commit 4a94cf21c5
1 changed files with 11 additions and 3 deletions
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14
bitbake/lib/bb/cache.py
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@@ -873,6 +873,10 @@ class MultiProcessCache(object):
if not self.cachefile:
return
have_data = any(self.cachedata_extras)
if not have_data:
return
glf = bb.utils.lockfile(self.cachefile + ".lock", shared=True)
i = os.getpid()
@@ -907,6 +911,8 @@ class MultiProcessCache(object):
data = self.cachedata
have_data = False
for f in [y for y in os.listdir(os.path.dirname(self.cachefile)) if y.startswith(os.path.basename(self.cachefile) + '-')]:
f = os.path.join(os.path.dirname(self.cachefile), f)
try:
@@ -921,12 +927,14 @@ class MultiProcessCache(object):
os.unlink(f)
continue
have_data = True
self.merge_data(extradata, data)
os.unlink(f)
with open(self.cachefile, "wb") as f:
p = pickle.Pickler(f, -1)
p.dump([data, self.__class__.CACHE_VERSION])
if have_data:
with open(self.cachefile, "wb") as f:
p = pickle.Pickler(f, -1)
p.dump([data, self.__class__.CACHE_VERSION])
bb.utils.unlockfile(glf)