Mercurial > hg
view mercurial/txnutil.py @ 40999:dcac24ec935b
commandserver: preload repository in master server and reuse its file cache
This greatly speeds up repository operation with lots of obsolete markers:
$ ls -lh .hg/store/obsstore
-rw-r--r-- 1 yuya yuya 21M Dec 2 17:55 .hg/store/obsstore
$ time hg log -G -l10 --pager no
(hg) 1.79s user 0.13s system 99% cpu 1.919 total
(chg uncached) 0.00s user 0.01s system 0% cpu 1.328 total
(chg cached) 0.00s user 0.00s system 3% cpu 0.180 total
As you can see, the implementation of the preloader function is highly
experimental. It works, but I'm yet to be sure how things can be organized.
So I don't want to formalize the API at this point.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Wed, 31 Oct 2018 22:43:08 +0900 |
parents | 206532700213 |
children | 2372284d9457 |
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# txnutil.py - transaction related utilities # # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import errno from . import ( encoding, ) def mayhavepending(root): '''return whether 'root' may have pending changes, which are visible to this process. ''' return root == encoding.environ.get('HG_PENDING') def trypending(root, vfs, filename, **kwargs): '''Open file to be read according to HG_PENDING environment variable This opens '.pending' of specified 'filename' only when HG_PENDING is equal to 'root'. This returns '(fp, is_pending_opened)' tuple. ''' if mayhavepending(root): try: return (vfs('%s.pending' % filename, **kwargs), True) except IOError as inst: if inst.errno != errno.ENOENT: raise return (vfs(filename, **kwargs), False)