Mercurial > hg
view contrib/all-revsets.txt @ 39506:b66ea3fc3a86
sparse-revlog: set max delta chain length to on thousand
The new snapshot system used in the sparse-revlog case gave us some small size
benefit so far. However its most important property is to gracefully handle
harder limit on delta chainlength.
Long delta chain has a very detrimental impact on read (and write) performance
in revlog. Being able to shorter them provide a great boost. However, shorting
delta used to result significantly lower compression ratio. The intermediate
snapshots effectively suppress most of this effect (even all in some case).
# Effect on the test repository
The repository we use for test is not "realistic" but can still show this in
action using an unreasonably low chain limit. Limiting the chain length show a
sizeable increase but stay under control: +6% for limit=15; +15% for limit=10.
Without the snapshot system the increase is significantly bigger: +45% for
limit=15; +80% for limit=10. Even slightly larger than without delta chain
limit, the resulting size is still smaller than before we started doing
snapshots.
Here is a table for comparison. *Since the repository is not branchy, the
initial sparse-revlog version does not bring much benefit compare to the
non-sparse one):
chain length limit | none | limit=15 | limit=10 |
without sparse-revlog | 62 818 987 | 112 664 615 | 131 222 574 |
without snapshot | 74 365 490 | 108 211 410 | 133 857 764 |
with snapshot | 59 230 936 | 63 002 924 | 68 415 329 |
# Effect On Real Life Repositories
The series provides significant benefits on all kind of repositories.
Using `hg debugupgraderepo -o redeltaparent --run`, we recomputed delta chain
for various repositories with different settings:
- delta chain length: unlimited or 1000 limit
- sparse-revlog: enabled or disabled
- this series: applied or not applied
We can observe multiple types of effect:
- On very branchy repositories:
* The delta chain limit as low impact on the repo size.
* Intermediate snapshot greatly reduces manifest size:
- pypy: -80%
- netbeans: -95%
* The delta chain limit is effective, without a size impact:
- netbeans average: 613 -> 282
- private #1 average: 1 068 -> 307
- On more linear repository:
* Intermediate snapshot limit the impact of delta chain limit:
- mozilla:
without the series: +360%
with the series: +25%
* The delta chain limit provides large improvement:
- mozilla's average chain length:
unlimited: 15 338
limited: 469
* Despite the chain length limit, the manifest size is reduced:
- mercurial: -25%
- mozilla: -30%
It is clear that the use of chains of intermediate snapshots provide large
benefits both in storage size and delta chains quality. We should now switch our
effort toward making sure the write performance are acceptable. Then,
`sparse-revlog` will be a suitable format for all new repository.
# Raw Statistic
* no-sparse: general delta repository not using sparse-revlog
* no-snapshot: sparse-revlog repository not using this series
* snapshot: sparse-revlog repository using this series
mercurial
Manifest Size:
limit | none | 1000
------------|-------------|------------
no-sparse | 8 021 373 | 8 199 366
no-snapshot | 8 103 561 | 8 259 719
snapshot | 6 137 116 | 6 126 433
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 307 | 1456 || 279 | 1000 ||
no-snapshot || 312 | 1456 || 283 | 1000 ||
snapshot || 248 | 1208 || 241 | 1000 ||
Full Store Size
limit | none | 1000
------------|-------------|------------
no-sparse | 51 013 198 | 51 201 574
no-snapshot | 50 930 795 | 51 141 006
snapshot | 48 072 037 | 48 093 572
pypy
Manifest Size:
limit | none | 1000
------------|-------------|------------
no-sparse | 193 987 784 | 193 987 784
no-snapshot | 163 171 745 | 163 312 229
snapshot | 34 605 900 | 34 600 750
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 101 | 692 || 101 | 692 ||
no-snapshot || 151 | 1307 || 148 | 1000 ||
snapshot || 128 | 1309 || 125 | 1000 ||
Full Store Size
limit | none | 1000
------------|-------------|------------
no-sparse | 495 931 473 | 495 931 473
no-snapshot | 465 441 017 | 465 581 501
snapshot | 355 467 301 | 355 472 451
Mozilla
Manifest Size:
limit | none | 1000
------------|----------------|---------------
no-sparse | 416 757 148 | 1 869 009 668
no-snapshot | 401 592 370 | 1 843 493 795
snapshot | 224 359 521 | 284 615 500
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 15 333 | 58 980 || 468 | 1 000 ||
no-snapshot || 15 336 | 58 980 || 469 | 1 000 ||
snapshot || 15 338 | 58 983 || 469 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 2 712 477 887 | 4 164 995 451
no-snapshot | 2 698 887 835 | 4 141 054 304
snapshot | 2 518 130 385 | 2 578 587 596
Netbeans
Manifest Size:
limit | none | 1000
------------|----------------|---------------
no-sparse | 4 766 794 101 | 4 870 642 687
no-snapshot | 4 334 806 082 | 4 428 681 309
snapshot | 232 659 666 | 240 330 665
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 597 | 6802 || 254 | 1 000 ||
no-snapshot || 648 | 6 802 || 305 | 1 000 ||
snapshot || 613 | 6 804 || 282 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 5 807 347 998 | 5 911 196 584
no-snapshot | 5 375 398 602 | 5 469 273 829
snapshot | 1 282 519 928 | 1 290 190 927
Private repo #1
Manifest Size:
limit | none | 1000
------------|-----------------|---------------
no-sparse | 41 389 010 840 | 41 398 162 091
no-snapshot | 9 737 319 435 | 10 223 773 150
snapshot | 744 215 807 | 747 961 822
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 245 | 8 885 || 81 | 1 000 ||
no-snapshot || 1 225 | 8 885 || 336 | 1 000 ||
snapshot || 1 068 | 7 909 || 307 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 49 646 065 126 | 49 655 216 377
no-snapshot | 17 924 862 856 | 18 411 316 571
snapshot | 9 009 024 710 | 9 012 770 725
Private repo #2
We currently have less data available for that repository.
* Before is a sparse-revlog repository without this series
* After is a sparse-revlog repository with this series + 1000 chain limit
Manifest Size:
Before: 1 531 485 040 bytes
After: 1 091 422 451 bytes
Manifest Chain:
Before: 2 218 avg; 6 575 Max
After: 442 avg; 1 000 Max
Full Store Size
Before: 15 203 955 615
after: 8 207 180 693
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Fri, 07 Sep 2018 11:18:45 -0400 |
parents | 70a4289896b0 |
children | 5409f7ec7850 |
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# All revsets ever used with revsetbenchmarks.py script # # The goal of this file is to gather all revsets ever used for benchmarking # revset's performance. It should be used to gather revsets that test a # specific usecase or a specific implementation of revset predicates. # If you are working on the smartset implementation itself, check # 'base-revsets.txt'. # # Please update this file with any revsets you use for benchmarking a change so # that future contributors can easily find and retest it when doing further # modification. Feel free to highlight interesting variants if needed. ## Revset from this section are all extracted from changelog when this file was # created. Feel free to dig and improve documentation. # Used in revision da05fe01170b (20000::) - (20000) # Used in revision 95af98616aa7 parents(20000) # Used in revision 186fd06283b4 (_intlist('20000\x0020001')) and merge() # Used in revision 911f5a6579d1 p1(20000) p2(10000) # Used in revision b6dc3b79bb25 0:: # Used in revision faf4f63533ff bookmark() # Used in revision 22ba2c0825da tip~25 # Used in revision 0cf46b8298fe bisect(range) # Used in revision 5b65429721d5 divergent() # Used in revision 6261b9c549a2 file(COPYING) # Used in revision 44f471102f3a follow(COPYING) # Used in revision 8040a44aab1c origin(tip) # Used in revision bbf4f3dfd700 rev(25) # Used in revision a428db9ab61d p1() # Used in revision c1546d7400ef min(0::) # Used in revision 546fa6576815 author(lmoscovicz) or author(mpm) author(mpm) or author(lmoscovicz) # Used in revision 9bfe68357c01 public() and id("d82e2223f132") # Used in revision ba89f7b542c9 rev(25) # Used in revision eb763217152a rev(210000) # Used in revision 69524a05a7fa 10:100 parents(10):parents(100) # Used in revision 6f1b8b3f12fd 100~5 parents(100)~5 (100~5)~5 # Used in revision 7a42e5d4c418 children(tip~100) # Used in revision 7e8737e6ab08 100^1 parents(100)^1 (100^1)^1 # Used in revision 30e0dcd7c5ff matching(100) matching(parents(100)) # Used in revision aafeaba22826 0|1|2|3|4|5|6|7|8|9 # Used in revision 33c7a94d4dd0 tip:0 # Used in revision 7d369fae098e (0:100000) # Used in revision b333ca94403d 0 + 1 + 2 + ... + 200 0 + 1 + 2 + ... + 1000 sort(0 + 1 + 2 + ... + 200) sort(0 + 1 + 2 + ... + 1000) # Used in revision 7fbef7932af9 first(0 + 1 + 2 + ... + 1000) # Used in revision ceaf04bb14ff 0:1000 # Used in revision 262e6ad93885 not public() (tip~1000::) - public() not public() and branch("default") # Used in revision 15412bba5a68 0::tip ## all the revsets from this section have been taken from the former central file # for revset's benchmarking, they are undocumented for this reason. all() draft() ::tip draft() and ::tip ::tip and draft() author(lmoscovicz) author(mpm) ::p1(p1(tip)):: public() :10000 and public() :10000 and draft() (not public() - obsolete()) # The one below is used by rebase (children(ancestor(tip~5, tip)) and ::(tip~5)):: # those two `roots(...)` inputs are close to what phase movement use. roots((tip~100::) - (tip~100::tip)) roots((0::) - (0::tip)) # more roots testing roots(tip~100:) roots(:42) roots(not public()) roots((0:tip)::) roots(0::tip) 42:68 and roots(42:tip) # Used in revision f140d6207cca roots(0:tip) # test disjoint set with multiple roots roots((:42) + (tip~42:)) # Testing the behavior of "head()" in various situations head() head() - public() draft() and head() head() and author("mpm") # testing the mutable phases set draft() secret() # test finding common ancestors heads(commonancestors(last(head(), 2))) heads(commonancestors(head()))