branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
import os
from mercurial.hgweb import hgwebdir_mod
hgwebdir = hgwebdir_mod.hgwebdir
os.mkdir(b'webdir')
os.chdir(b'webdir')
webdir = os.path.realpath(b'.')
def trivial_response(req, res):
return []
def make_hgwebdir(gc_rate=None):
config = os.path.join(webdir, b'hgwebdir.conf')
with open(config, 'wb') as configfile:
configfile.write(b'[experimental]\n')
if gc_rate is not None:
configfile.write(b'web.full-garbage-collection-rate=%d\n' % gc_rate)
hg_wd = hgwebdir(config)
hg_wd._runwsgi = trivial_response
return hg_wd
def process_requests(webdir_instance, number):
# we don't care for now about passing realistic arguments
for _ in range(number):
for chunk in webdir_instance.run_wsgi(None, None):
pass
without_gc = make_hgwebdir(gc_rate=0)
process_requests(without_gc, 5)
assert without_gc.requests_count == 5
assert without_gc.gc_full_collections_done == 0
with_gc = make_hgwebdir(gc_rate=2)
process_requests(with_gc, 5)
assert with_gc.requests_count == 5
assert with_gc.gc_full_collections_done == 2
with_systematic_gc = make_hgwebdir() # default value of the setting
process_requests(with_systematic_gc, 3)
assert with_systematic_gc.requests_count == 3
assert with_systematic_gc.gc_full_collections_done == 3