view tests/test-static-http.t @ 44363:f7459da77f23

nodemap: introduce an option to use mmap to read the nodemap mapping

The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.

This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).

Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:

Before:

 * do not use the persistent nodemap
 * use the CPython implementation of the index for nodemap
 * use mmapping of the changelog index

After:

 * use the MixedIndex Rust code, with the NodeTree object for nodemap access
   (still in review)
 * use the persistent nodemap data from disk
 * access the persistent nodemap data through mmap
 * use mmapping of the changelog index

The persistent nodemap greatly speed up  most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.

Here are some numbers (in seconds) for the reference copy of mozilla-try:

Revset            Before   After     abs-change speedup

-10000:           0.004622 0.005532   0.000910  ×   0.83
-10:              0.000050 0.000132   0.000082  ×   0.37
tip               0.000052 0.000085   0.000033  ×   0.61
0 + (-10000:)     0.028222 0.005337  -0.022885  ×   5.29
0                 0.023521 0.000084  -0.023437  × 280.01
(-10000:) + 0     0.235539 0.005308  -0.230231  ×  44.37
(-10:) + :9       0.232883 0.000180  -0.232703  ×1293.79
(-10000:) + (:99) 0.238735 0.005358  -0.233377  ×  44.55
:99 + (-10000:)   0.317942 0.005593  -0.312349  ×  56.84
:9 + (-10:)       0.313372 0.000179  -0.313193  ×1750.68
:9                0.316450 0.000143  -0.316307  ×2212.93


On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.

Here are some numbers (in seconds) for the reference copy of mercurial:

Revset            Before   After     abs-change speedup
-10:              0.000065 0.000097   0.000032  × 0.67
tip               0.000063 0.000078   0.000015  × 0.80
0                 0.000561 0.000079  -0.000482  × 7.10
-10000:           0.004609 0.003648  -0.000961  × 1.26
0 + (-10000:)     0.005023 0.003715  -0.001307  × 1.35
(-10:) + :9       0.002187 0.000108  -0.002079  ×20.25
(-10000:) + 0     0.006252 0.003716  -0.002536  × 1.68
(-10000:) + (:99) 0.006367 0.003707  -0.002660  × 1.71
:9 + (-10:)       0.003846 0.000110  -0.003736  ×34.96
:9                0.003854 0.000099  -0.003755  ×38.92
:99 + (-10000:)   0.007644 0.003778  -0.003866  × 2.02

Differential Revision: https://phab.mercurial-scm.org/D7894

#require no-reposimplestore

  $ hg clone http://localhost:$HGPORT/ copy
  abort: * (glob)
  [255]
  $ test -d copy
  [1]

This server doesn't do range requests so it's basically only good for
one pull

  $ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid \
  > --logfile server.log
  $ cat dumb.pid >> $DAEMON_PIDS
  $ hg init remote
  $ cd remote
  $ echo foo > bar
  $ echo c2 > '.dotfile with spaces'
  $ hg add
  adding .dotfile with spaces
  adding bar
  $ hg commit -m"test"
  $ hg tip
  changeset:   0:02770d679fb8
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     test
  
  $ cd ..
  $ hg clone static-http://localhost:$HGPORT/remote local
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 02770d679fb8
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd local
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 1 changesets with 2 changes to 2 files
  $ cat bar
  foo
  $ cd ../remote
  $ echo baz > quux
  $ hg commit -A -mtest2
  adding quux

check for HTTP opener failures when cachefile does not exist

  $ rm .hg/cache/*
  $ cd ../local
  $ cat >> .hg/hgrc <<EOF
  > [hooks]
  > changegroup = sh -c "printenv.py --line changegroup"
  > EOF
  $ hg pull
  pulling from static-http://localhost:$HGPORT/remote
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets 4ac2e3648604
  changegroup hook: HG_HOOKNAME=changegroup
  HG_HOOKTYPE=changegroup
  HG_NODE=4ac2e3648604439c580c69b09ec9d93a88d93432
  HG_NODE_LAST=4ac2e3648604439c580c69b09ec9d93a88d93432
  HG_SOURCE=pull
  HG_TXNID=TXN:$ID$
  HG_TXNNAME=pull
  http://localhost:$HGPORT/remote
  HG_URL=http://localhost:$HGPORT/remote
  
  (run 'hg update' to get a working copy)

trying to push

  $ hg update
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo more foo >> bar
  $ hg commit -m"test"
  $ hg push
  pushing to static-http://localhost:$HGPORT/remote
  abort: destination does not support push
  [255]

trying clone -r

  $ cd ..
  $ hg clone -r doesnotexist static-http://localhost:$HGPORT/remote local0
  abort: unknown revision 'doesnotexist'!
  [255]
  $ hg clone -r 0 static-http://localhost:$HGPORT/remote local0
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 02770d679fb8
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

test with "/" URI (issue747) and subrepo

  $ hg init
  $ hg init sub
  $ touch sub/test
  $ hg -R sub commit -A -m "test"
  adding test
  $ hg -R sub tag not-empty
  $ echo sub=sub > .hgsub
  $ echo a > a
  $ hg add a .hgsub
  $ hg -q ci -ma
  $ hg clone static-http://localhost:$HGPORT/ local2
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 3 changes to 3 files
  new changesets a9ebfbe8e587
  updating to branch default
  cloning subrepo sub from static-http://localhost:$HGPORT/sub
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets be090ea66256:322ea90975df
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd local2
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 1 changesets with 3 changes to 3 files
  checking subrepo links
  $ cat a
  a
  $ hg paths
  default = static-http://localhost:$HGPORT/

test with empty repo (issue965)

  $ cd ..
  $ hg init remotempty
  $ hg clone static-http://localhost:$HGPORT/remotempty local3
  no changes found
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd local3
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 0 changesets with 0 changes to 0 files
  $ hg paths
  default = static-http://localhost:$HGPORT/remotempty

test with non-repo

  $ cd ..
  $ mkdir notarepo
  $ hg clone static-http://localhost:$HGPORT/notarepo local3
  abort: 'http://localhost:$HGPORT/notarepo' does not appear to be an hg repository!
  [255]

Clone with tags and branches works

  $ hg init remote-with-names
  $ cd remote-with-names
  $ echo 0 > foo
  $ hg -q commit -A -m initial
  $ echo 1 > foo
  $ hg commit -m 'commit 1'
  $ hg -q up 0
  $ hg branch mybranch
  marked working directory as branch mybranch
  (branches are permanent and global, did you want a bookmark?)
  $ echo 2 > foo
  $ hg commit -m 'commit 2 (mybranch)'
  $ hg tag -r 1 'default-tag'
  $ hg tag -r 2 'branch-tag'

  $ cd ..

  $ hg clone static-http://localhost:$HGPORT/remote-with-names local-with-names
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 2 files (+1 heads)
  new changesets 68986213bd44:0c325bd2b5a7
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

Clone a specific branch works

  $ hg clone -r mybranch static-http://localhost:$HGPORT/remote-with-names local-with-names-branch
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 4 changes to 2 files
  new changesets 68986213bd44:0c325bd2b5a7
  updating to branch mybranch
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

Clone a specific tag works

  $ hg clone -r default-tag static-http://localhost:$HGPORT/remote-with-names local-with-names-tag
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  new changesets 68986213bd44:4ee3fcef1c80
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ killdaemons.py

List of files accessed over HTTP:

  $ cat server.log | sed -n -e 's|.*GET \(/[^ ]*\).*|\1|p' | sort -u
  /.hg/bookmarks
  /.hg/bookmarks.current
  /.hg/cache/hgtagsfnodes1
  /.hg/cache/rbc-names-v1
  /.hg/cache/rbc-revs-v1
  /.hg/requires
  /.hg/store/00changelog.i
  /.hg/store/00manifest.i
  /.hg/store/data/%7E2ehgsub.i (no-py37 !)
  /.hg/store/data/%7E2ehgsubstate.i (no-py37 !)
  /.hg/store/data/a.i
  /.hg/store/data/~2ehgsub.i (py37 !)
  /.hg/store/data/~2ehgsubstate.i (py37 !)
  /notarepo/.hg/00changelog.i
  /notarepo/.hg/requires
  /remote-with-names/.hg/bookmarks
  /remote-with-names/.hg/bookmarks.current
  /remote-with-names/.hg/cache/branch2-served
  /remote-with-names/.hg/cache/hgtagsfnodes1
  /remote-with-names/.hg/cache/rbc-names-v1
  /remote-with-names/.hg/cache/rbc-revs-v1
  /remote-with-names/.hg/cache/tags2-served
  /remote-with-names/.hg/localtags
  /remote-with-names/.hg/requires
  /remote-with-names/.hg/store/00changelog.i
  /remote-with-names/.hg/store/00manifest.i
  /remote-with-names/.hg/store/data/%7E2ehgtags.i (no-py37 !)
  /remote-with-names/.hg/store/data/foo.i
  /remote-with-names/.hg/store/data/~2ehgtags.i (py37 !)
  /remote/.hg/bookmarks
  /remote/.hg/bookmarks.current
  /remote/.hg/cache/branch2-base
  /remote/.hg/cache/branch2-immutable
  /remote/.hg/cache/branch2-served
  /remote/.hg/cache/hgtagsfnodes1
  /remote/.hg/cache/rbc-names-v1
  /remote/.hg/cache/rbc-revs-v1
  /remote/.hg/cache/tags2-served
  /remote/.hg/localtags
  /remote/.hg/requires
  /remote/.hg/store/00changelog.i
  /remote/.hg/store/00manifest.i
  /remote/.hg/store/data/%7E2edotfile%20with%20spaces.i (no-py37 !)
  /remote/.hg/store/data/%7E2ehgtags.i (no-py37 !)
  /remote/.hg/store/data/bar.i
  /remote/.hg/store/data/quux.i
  /remote/.hg/store/data/~2edotfile%20with%20spaces.i (py37 !)
  /remote/.hg/store/data/~2ehgtags.i (py37 !)
  /remotempty/.hg/bookmarks
  /remotempty/.hg/bookmarks.current
  /remotempty/.hg/requires
  /remotempty/.hg/store/00changelog.i
  /remotempty/.hg/store/00manifest.i
  /sub/.hg/bookmarks
  /sub/.hg/bookmarks.current
  /sub/.hg/cache/hgtagsfnodes1
  /sub/.hg/cache/rbc-names-v1
  /sub/.hg/cache/rbc-revs-v1
  /sub/.hg/requires
  /sub/.hg/store/00changelog.i
  /sub/.hg/store/00manifest.i
  /sub/.hg/store/data/%7E2ehgtags.i (no-py37 !)
  /sub/.hg/store/data/test.i
  /sub/.hg/store/data/~2ehgtags.i (py37 !)