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Code Issues Releases Wiki Activity

use posix_fadvise for repo writes also

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Thomas Waldmann 2015-04-11 02:40:22 +02:00
parent c7d232c4ce
commit 874f5c491b
1 changed files with 4 additions and 0 deletions
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4
attic/repository.py
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@ -555,6 +555,10 @@ def write_put(self, id, data):
header = self.header_no_crc_fmt.pack(size, TAG_PUT)
crc = self.crc_fmt.pack(crc32(data, crc32(id, crc32(header))) & 0xffffffff)
fd.write(b''.join((crc, header, id, data)))
if hasattr(os, 'posix_fadvise'): # python >= 3.3, only on UNIX
# tell the OS that it does not need to cache what we just wrote,
# avoids spoiling the cache for the OS and other processes.
os.posix_fadvise(fd.fileno(), 0, 0, os.POSIX_FADV_DONTNEED)
self.offset += size
return self.segment, offset