status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

     1

#require no-windows

     2

     3

  $ . "$TESTDIR/remotefilelog-library.sh"

     4

     5

  $ hg init master

     6

  $ cd master

     7

  $ cat >> .hg/hgrc <<EOF

     8

  > [remotefilelog]

     9

  > server=True

    10

  > serverexpiration=-1

    11

  > EOF

    12

  $ echo x > x

    13

  $ hg commit -qAm x

    14

  $ echo y > y

    15

  $ hg commit -qAm y

    16

  $ echo z > z

    17

  $ hg commit -qAm z

    18

  $ cd ..

    19

    20

  $ hgcloneshallow ssh://user@dummy/master shallow -q

    21

  3 files fetched over 1 fetches - (3 misses, 0.00% hit ratio) over *s (glob)

    22

    23

# Compute keepset for 0th and 2nd commit, which implies that we do not process

    24

# the 1st commit, therefore we diff 2nd manifest with the 0th manifest and

    25

# populate the keepkeys from the diff

    26

  $ cd shallow

    27

  $ cat >> .hg/hgrc <<EOF

    28

  > [remotefilelog]

    29

  > pullprefetch=0+2

    30

  > EOF

    31

  $ hg debugkeepset

    32

    33

# Compute keepset for all commits, which implies that we only process deltas of

    34

# manifests of commits 1 and 2 and therefore populate the keepkeys from deltas

    35

  $ cat >> .hg/hgrc <<EOF

    36

  > [remotefilelog]

    37

  > pullprefetch=all()

    38

  > EOF

    39

  $ hg debugkeepset