##// END OF EJS Templates
upstream » mercurial-mirror
RSS

Clone from https://www.mercurial-scm.org/repo/hg-all

discovery: slowly increase sampling size...
discovery: slowly increase sampling size Some pathological discovery runs can requires many roundtrip. When this happens things can get very slow. To make the algorithm more resilience again such pathological case. We slowly increase the sample size with each roundtrip (+5%). This will have a negligible impact on "normal" discovery with few roundtrips, but a large positive impact of case with many roundtrips. Asking more question per roundtrip helps to reduce the undecided set faster. Instead of reducing the undecided set a linear speed (in the worst case), we reduce it as a guaranteed (small) exponential rate. The data below show this slow ramp up in sample size: round trip | 1 | 5 | 10 | 20 | 50 | 100 | 130 | sample size | 200 | 254 | 321 | 517 | 2 199 | 25 123 | 108 549 | covered nodes | 200 | 1 357 | 2 821 | 7 031 | 42 658 | 524 530 | 2 276 755 | To be a bit more concrete, lets take a very pathological case as an example. We are doing discovery from a copy of Mozilla-try to a more recent version of mozilla-unified. Mozilla-unified heads are unknown to the mozilla-try repo and there are over 1 million "missing" changesets. (the discovery is "local" to avoid network interference) Without this change, the discovery: - last 1858 seconds (31 minutes), - does 1700 round trip, - asking about 340 000 nodes. With this change, the discovery: - last 218 seconds (3 minutes, 38 seconds a -88% improvement), - does 94 round trip (-94%), - asking about 344 211 nodes (+1%). Of course, this is an extreme case (and 3 minutes is still slow). However this give a good example of how this sample size increase act as a safety net catching any bad situations. We could image a steeper increase than 5%. For example 10% would give the following number: round trip | 1 | 5 | 10 | 20 | 50 | 75 | 100 | sample size | 200 | 321 | 514 | 1 326 | 23 060 | 249 812 | 2 706 594 | covered nodes | 200 | 1 541 | 3 690 | 12 671 | 251 871 | 2 746 254 | 29 770 966 | In parallel, it is useful to understand these pathological cases and improve them. However the current change provides a general purpose safety net to smooth the impact of pathological cases. To avoid issue with older http server, the increase in sample size only occurs if the protocol has not limit on command argument size.
Yuya Nishihara - - Load All Authors

File last commit:

r37418:47aea60d default
r42546:dbd0fcca default
Show More
map
41 lines | 1.2 KiB | text/plain | TextLexer
/ mercurial / templates / raw / map
History | Source | Raw |Copy content |Copy permalink
Matt Mackall
hgweb: avoid traceback if raw is used as default style...
 r17277 default = 'shortlog'
shortlog = "'raw' is not a browsable style"
Alexander Plavin
hgweb: add changelog and search templates to raw style...
 r19429 changelog = changelog.tmpl
changelogentry = logentry.tmpl
search = search.tmpl
Dan Villiom Podlaski Christiansen
setup: install translation files as package data...
 r9999 mimetype = 'text/plain; charset={encoding}'
header = ''
footer = ''
changeset = changeset.tmpl
difflineplus = '{line}'
difflineminus = '{line}'
difflineat = '{line}'
diffline = '{line}'
changesetparent = '# Parent {node}'
changesetchild = '# Child {node}'
filenodelink = ''
Matt Mackall
templates: add filenolink to raw style (issue2332)
 r11936 filenolink = ''
Dan Villiom Podlaski Christiansen
setup: install translation files as package data...
 r9999 fileline = '{line}'
diffblock = '{lines}'
filediff = filediff.tmpl
fileannotate = fileannotate.tmpl
annotateline = '{author|user}@{rev}: {line}'
manifest = manifest.tmpl
direntry = 'drwxr-xr-x {basename}\n'
fileentry = '{permissions|permissions} {size} {basename}\n'
index = index.tmpl
notfound = notfound.tmpl
error = error.tmpl
indexentry = '{url}\n'
tags = '{entries%tagentry}'
tagentry = '{tag} {node}\n'
Yuya Nishihara
hgweb: add bookmarks listing to raw style with test case
 r13921 bookmarks = '{entries%bookmarkentry}'
bookmarkentry = '{bookmark} {node}\n'
Dan Villiom Podlaski Christiansen
setup: install translation files as package data...
 r9999 branches = '{entries%branchentry}'
branchentry = '{branch} {node} {status}\n'
Paul Boddie
hgweb: make graph data suitable for template usage...
 r16773 graph = graph.tmpl
graphnode = graphnode.tmpl
graphedge = graphedge.tmpl
bookmarkname = 'bookmark: {name}\n'
branchname = 'branch: {name}\n'
tagname = 'tag: {name}\n'