| Commit message (Collapse) | Author | Age | Files | Lines |
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"git pack-objects" in a repository with many packfiles used to
spend a lot of time looking for/at objects in them; the accesses to
the packfiles are now optimized by checking the most-recently-used
packfile first.
* jk/pack-objects-optim-mru:
pack-objects: use mru list when iterating over packs
pack-objects: break delta cycles before delta-search phase
sha1_file: make packed_object_info public
provide an initializer for "struct object_info"
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In the original implementation of want_object_in_pack(), we
always looked for the object in every pack, so the order did
not matter for performance.
As of the last few patches, however, we can now often break
out of the loop early after finding the first instance, and
avoid looking in the other packs at all. In this case, pack
order can make a big difference, because we'd like to find
the objects by looking at as few packs as possible.
This patch switches us to the same packed_git_mru list that
is now used by normal object lookups.
Here are timings for p5303 on linux.git:
Test HEAD^ HEAD
------------------------------------------------------------------------
5303.3: rev-list (1) 31.31(31.07+0.23) 31.28(31.00+0.27) -0.1%
5303.4: repack (1) 40.35(38.84+2.60) 40.53(39.31+2.32) +0.4%
5303.6: rev-list (50) 31.37(31.15+0.21) 31.41(31.16+0.24) +0.1%
5303.7: repack (50) 58.25(68.54+2.03) 47.28(57.66+1.89) -18.8%
5303.9: rev-list (1000) 31.91(31.57+0.33) 31.93(31.64+0.28) +0.1%
5303.10: repack (1000) 304.80(376.00+3.92) 87.21(159.54+2.84) -71.4%
The rev-list numbers are unchanged, which makes sense (they
are not exercising this code at all). The 50- and 1000-pack
repack cases show considerable improvement.
The single-pack repack case doesn't, of course; there's
nothing to improve. In fact, it gives us a baseline for how
fast we could possibly go. You can see that though rev-list
can approach the single-pack case even with 1000 packs,
repack doesn't. The reason is simple: the loop we are
optimizing is only part of what the repack is doing. After
the "counting" phase, we do delta compression, which is much
more expensive when there are multiple packs, because we
have fewer deltas we can reuse (you can also see that these
numbers come from a multicore machine; the CPU times are
much higher than the wall-clock times due to the delta
phase).
So the good news is that in cases with many packs, we used
to be dominated by the "counting" phase, and now we are
dominated by the delta compression (which is faster, and
which we have already parallelized).
Here are similar numbers for git.git:
Test HEAD^ HEAD
---------------------------------------------------------------------
5303.3: rev-list (1) 1.55(1.51+0.02) 1.54(1.53+0.00) -0.6%
5303.4: repack (1) 1.82(1.80+0.08) 1.82(1.78+0.09) +0.0%
5303.6: rev-list (50) 1.58(1.57+0.00) 1.58(1.56+0.01) +0.0%
5303.7: repack (50) 2.50(3.12+0.07) 2.31(2.95+0.06) -7.6%
5303.9: rev-list (1000) 2.22(2.20+0.02) 2.23(2.19+0.03) +0.5%
5303.10: repack (1000) 10.47(16.78+0.22) 7.50(13.76+0.22) -28.4%
Not as impressive in terms of percentage, but still
measurable wins. If you look at the wall-clock time
improvements in the 1000-pack case, you can see that linux
improved by roughly 10x as many seconds as git. That's
because it has roughly 10x as many objects, and we'd expect
this improvement to scale linearly with the number of
objects (since the number of packs is kept constant). It's
just that the "counting" phase is a smaller percentage of
the total time spent for a git.git repack, and hence the
percentage win is smaller.
The implementation itself is a straightforward use of the
MRU code. We only bother marking a pack as used when we know
that we are able to break early out of the loop, for two
reasons:
1. If we can't break out early, it does no good; we have
to visit each pack anyway, so we might as well avoid
even the minor overhead of managing the cache order.
2. The mru_mark() function reorders the list, which would
screw up our traversal. So it is only safe to mark when
we are about to break out of the loop. We could record
the found pack and mark it after the loop finishes, of
course, but that's more complicated and it doesn't buy
us anything due to (1).
Note that this reordering does have a potential impact on
the final pack, as we store only a single "found" pack for
each object, even if it is present in multiple packs. In
principle, any copy is acceptable, as they all refer to the
same content. But in practice, they may differ in whether
they are stored as deltas, against which base, etc. This may
have an impact on delta reuse, and even the delta search
(since we skip pairs that were already in the same pack).
It's not clear whether this change of order would hurt or
even help average cases, though. The most likely reason to
have duplicate objects is from the completion of thin packs
(e.g., you have some objects in a "base" pack, then receive
several pushes; the packs you receive may be thin on the
wire, with deltas that refer to bases outside the pack, but
we complete them with duplicate base objects when indexing
them).
In such a case the current code would always find the thin
duplicates (because we currently walk the packs in reverse
chronological order). Whereas with this patch, some of those
duplicates would be found in the base pack instead.
In my tests repacking a real-world case of linux.git with
3600 thin-pack pushes (on top of a large "base" pack), the
resulting pack was about 0.04% larger with this patch. On
the other hand, because we were more likely to hit the base
pack, there were more opportunities for delta reuse, and we
had 50,000 fewer objects to examine in the delta search.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We do not allow cycles in the delta graph of a pack (i.e., A
is a delta of B which is a delta of A) for the obvious
reason that you cannot actually access any of the objects in
such a case.
There's a last-ditch attempt to notice cycles during the
write phase, during which we issue a warning to the user and
write one of the objects out in full. However, this is
"last-ditch" for two reasons:
1. By this time, it's too late to find another delta for
the object, so the resulting pack is larger than it
otherwise could be.
2. The warning is there because this is something that
_shouldn't_ ever happen. If it does, then either:
a. a pack we are reusing deltas from had its own
cycle
b. we are reusing deltas from multiple packs, and
we found a cycle among them (i.e., A is a delta of
B in one pack, but B is a delta of A in another,
and we choose to use both deltas).
c. there is a bug in the delta-search code
So this code serves as a final check that none of these
things has happened, warns the user, and prevents us
from writing a bogus pack.
Right now, (2b) should never happen because of the static
ordering of packs in want_object_in_pack(). If two objects
have a delta relationship, then they must be in the same
pack, and therefore we will find them from that same pack.
However, a future patch would like to change that static
ordering, which will make (2b) a common occurrence. In
preparation, we should be able to handle those kinds of
cycles better. This patch does by introducing a
cycle-breaking step during the get_object_details() phase,
when we are deciding which deltas can be reused. That gives
us the chance to feed the objects into the delta search as
if the cycle did not exist.
We'll leave the detection and warning in the write_object()
phase in place, as it still serves as a check for case (2c).
This does mean we will stop warning for (2a). That case is
caused by bogus input packs, and we ideally would warn the
user about it. However, since those cycles show up after
picking reusable deltas, they look the same as (2b) to us;
our new code will break the cycles early and the last-ditch
check will never see them.
We could do analysis on any cycles that we find to
distinguish the two cases (i.e., it is a bogus pack if and
only if every delta in the cycle is in the same pack), but
we don't need to. If there is a cycle inside a pack, we'll
run into problems not only reusing the delta, but accessing
the object data at all. So when we try to dig up the actual
size of the object, we'll hit that same cycle and kick in
our usual complain-and-try-another-source code.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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An all-zero initializer is fine for this struct, but because
the first element is a pointer, call sites need to know to
use "NULL" instead of "0". Otherwise some static checkers
like "sparse" will complain; see d099b71 (Fix some sparse
warnings, 2013-07-18) for example. So let's provide an
initializer to make this easier to get right.
But let's also comment that memset() to zero is explicitly
OK[1]. One of the callers embeds object_info in another
struct which is initialized via memset (expand_data in
builtin/cat-file.c). Since our subset of C doesn't allow
assignment from a compound literal, handling this in any
other way is awkward, so we'd like to keep the ability to
initialize by memset(). By documenting this property, it
should make anybody who wants to change the initializer
think twice before doing so.
There's one other caller of interest. In parse_sha1_header(),
we did not initialize the struct fully in the first place.
This turned out not to be a bug because the sub-function it
calls does not look at any other fields except the ones we
did initialize. But that assumption might not hold in the
future, so it's a dangerous construct. This patch switches
it to initializing the whole struct, which protects us
against unexpected reads of the other fields.
[1] Obviously using memset() to initialize a pointer
violates the C standard, but we long ago decided that it
was an acceptable tradeoff in the real world.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We call "qsort(array, nelem, sizeof(array[0]), fn)", and most of
the time third parameter is redundant. A new QSORT() macro lets us
omit it.
* rs/qsort:
show-branch: use QSORT
use QSORT, part 2
coccicheck: use --all-includes by default
remove unnecessary check before QSORT
use QSORT
add QSORT
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Shorten the code by using QSORT instead of calling qsort(3) directly,
as the former determines the element size automatically and checks if
there are at least two elements to sort already.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Convert two more qsort(3) calls to QSORT to reduce code size and for
better safety and consistency.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add a semantic patch for removing checks similar to the one that QSORT
already does internally and apply it to the code base.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Apply the semantic patch contrib/coccinelle/qsort.cocci to the code
base, replacing calls of qsort(3) with QSORT. The resulting code is
shorter and supports empty arrays with NULL pointers.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code clean-up with help from coccinelle tool continues.
* rs/cocci:
coccicheck: make transformation for strbuf_addf(sb, "...") more precise
use strbuf_add_unique_abbrev() for adding short hashes, part 2
use strbuf_addstr() instead of strbuf_addf() with "%s", part 2
gitignore: ignore output files of coccicheck make target
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Replace uses of strbuf_addf() for adding strings with more lightweight
strbuf_addstr() calls. This is shorter and makes the intent clearer.
bc57b9c0cc5a123365a922fa1831177e3fd607ed already converted three cases,
this patch covers two more.
A semantic patch for Coccinelle is included for easier checking for
new cases that might be introduced in the future.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Almost everybody uses DEFAULT_ABBREV to refer to the default
setting for the abbreviation, but "git blame" peeked into
underlying variable bypassing the macro for no good reason.
* jc/blame-abbrev:
blame: use DEFAULT_ABBREV macro
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This does not make any practical difference in today's code, but
everybody else accesses the default abbreviation length via the
DEFAULT_ABBREV macro. Make sure this oddball codepath does not
stray from the convention.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git log rev^..rev" is an often-used revision range specification
to show what was done on a side branch merged at rev. This has
gained a short-hand "rev^-1". In general "rev^-$n" is the same as
"^rev^$n rev", i.e. what has happened on other branches while the
history leading to nth parent was looking the other way.
* vn/revision-shorthand-for-side-branch-log:
revision: new rev^-n shorthand for rev^n..rev
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"git log rev^..rev" is commonly used to show all work done on and merged
from a side branch. This patch introduces a shorthand "rev^-" for this
and additionally allows "rev^-$n" to mean "reachable from rev, excluding
what is reachable from the nth parent of rev". For example, for a
two-parent merge, you can use rev^-2 to get the set of commits which were
made to the main branch while the topic branch was prepared.
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When given an abbreviated object name that is not (or more
realistically, "no longer") unique, we gave a fatal error
"ambiguous argument". This error is now accompanied by hints that
lists the objects that begins with the given prefix. During the
course of development of this new feature, numerous minor bugs were
uncovered and corrected, the most notable one of which is that we
gave "short SHA1 xxxx is ambiguous." twice without good reason.
* jk/ambiguous-short-object-names:
get_short_sha1: make default disambiguation configurable
get_short_sha1: list ambiguous objects on error
for_each_abbrev: drop duplicate objects
sha1_array: let callbacks interrupt iteration
get_short_sha1: mark ambiguity error for translation
get_short_sha1: NUL-terminate hex prefix
get_short_sha1: refactor init of disambiguation code
get_short_sha1: parse tags when looking for treeish
get_sha1: propagate flags to child functions
get_sha1: avoid repeating ourselves via ONLY_TO_DIE
get_sha1: detect buggy calls with multiple disambiguators
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The callbacks for iterating a sha1_array must have a void
return. This is unlike our usual for_each semantics, where
a callback may interrupt iteration and have its value
propagated. Let's switch it to the usual form, which will
enable its use in more places (e.g., where we are replacing
an existing iteration with a different data structure).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git init" tried to record core.worktree in the repository's
'config' file when GIT_WORK_TREE environment variable was set and
it was different from where GIT_DIR appears as ".git" at its top,
but the logic was faulty when .git is a "gitdir:" file that points
at the real place, causing trouble in working trees that are
managed by "git worktree". This has been corrected.
* nd/init-core-worktree-in-multi-worktree-world:
init: kill git_link variable
init: do not set unnecessary core.worktree
init: kill set_git_dir_init()
init: call set_git_dir_init() from within init_db()
init: correct re-initialization from a linked worktree
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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The function needs_work_tree_config() that is called from
create_default_files() is supposed to be fed the path to ".git" that
looks as if it is at the top of the working tree, and decide if that
location matches the actual worktree being used. This comparison allows
"git init" to decide if core.worktree needs to be recorded in the
working tree.
In the current code, however, we feed the return value from
get_git_dir(), which can be totally different from what the function
expects when "gitdir" file is involved. Instead of giving the path to
the ".git" at the top of the working tree, we end up feeding the actual
path that the file points at.
This original location of ".git" however is only known to init_db().
Make init_db() save it and have it passed to create_default_files() as a
new parameter, which passes the correct location down to
needs_work_tree_config() to fix this.
Noticed-by: Max Nordlund <max.nordlund@sqore.com>
Helped-by: Michael J Gruber <git@drmicha.warpmail.net>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This is a pure code move, necessary to kill the global variable git_link
later (and also helps a bit in the next patch).
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The next commit requires that set_git_dir_init() must be called before
init_db(). Let's make sure nobody can do otherwise.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When 'git init' is called from a linked worktree, we treat '.git'
dir (which is $GIT_COMMON_DIR/worktrees/something) as the main
'.git' (i.e. $GIT_COMMON_DIR) and populate the whole repository skeleton
in there. It does not harm anything (*) but it is still wrong.
Since 'git init' calls set_git_dir() at preparation time, which
indirectly calls get_common_dir() and correctly detects multiple
worktree setup, all git_path_buf() calls in create_default_files() will
return correct paths in both single and multiple worktree setups. The
only thing left is copy_templates(), which targets $GIT_DIR, not
$GIT_COMMON_DIR.
Fix that with get_git_common_dir(). This function will return $GIT_DIR
in single-worktree setup, so we don't have to make a special case for
multiple-worktree here.
(*) It does in fact, thanks to another bug. More on that later.
Noticed-by: Max Nordlund <max.nordlund@sqore.com>
Helped-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* rs/copy-array:
use COPY_ARRAY
add COPY_ARRAY
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Add a semantic patch for converting certain calls of memcpy(3) to
COPY_ARRAY() and apply that transformation to the code base. The result
is
shorter and safer code. For now only consider calls where source and
destination have the same type, or in other words: easy cases.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git worktree", even though it used the default_abbrev setting that
ought to be affected by core.abbrev configuration variable, ignored
the variable setting. The command has been taught to read the
default set of configuration variables to correct this.
* jc/worktree-config:
worktree: honor configuration variables
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The command accesses default_abbrev (defined in environment.c and is
updated via core.abbrev configuration), but never makes any call to
git_config(). The output from "worktree list" ignores the abbrev
setting for this reason.
Make a call to git_config() to read the default set of configuration
variables at the beginning of the command.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Message cleanup.
* ah/misc-message-fixes:
unpack-trees: do not capitalize "working"
git-merge-octopus: do not capitalize "octopus"
git-rebase--interactive: fix English grammar
cat-file: put spaces around pipes in usage string
am: put spaces around pipe in usage string
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"git symbolic-ref -d HEAD" happily removes the symbolic ref, but
the resulting repository becomes an invalid one. Teach the command
to forbid removal of HEAD.
* jc/forbid-symbolic-ref-d-HEAD:
symbolic-ref -d: do not allow removal of HEAD
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"git clone --recurse-submodules" lost the progress eye-candy in
recent update, which has been corrected.
* jk/clone-recursive-progress:
clone: pass --progress decision to recursive submodules
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When cloning with "--recursive", we'd generally expect
submodules to show progress reports if the main clone did,
too.
In older versions of git, this mostly worked out of the
box. Since we show progress by default when stderr is a tty,
and since the child clones inherit the parent stderr, then
both processes would come to the same decision by default.
If the parent clone was asked for "--quiet", we passed down
"--quiet" to the child. However, if stderr was not a tty and
the user specified "--progress", we did not propagate this
to the child.
That's a minor bug, but things got much worse when we
switched recently to submodule--helper's update_clone
command. With that change, the stderr of the child clones
are always connected to a pipe, and we never output
progress at all.
This patch teaches git-submodule and git-submodule--helper
how to pass down an explicit "--progress" flag when cloning.
The clone command then decides to propagate that flag based
on the cloning decision made earlier (which takes into
account isatty(2) of the parent process, existing --progress
or --quiet flags, etc). Since the child processes always run
without a tty on stderr, we don't have to worry about
passing an explicit "--no-progress"; it's the default for
them.
This fixes the recent loss of progress during recursive
clones. And as a bonus, it makes:
git clone --recursive --progress ... 2>&1 | cat
work by triggering progress explicitly in the children.
Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* rs/checkout-init-macro:
introduce CHECKOUT_INIT
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Add a static initializer for struct checkout and use it throughout the
code base. It's shorter, avoids a memset(3) call and makes sure the
base_dir member is initialized to a valid (empty) string.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git add --chmod=+x <pathspec>" added recently only toggled the
executable bit for paths that are either new or modified. This has
been corrected to flip the executable bit for all paths that match
the given pathspec.
* tg/add-chmod+x-fix:
t3700-add: do not check working tree file mode without POSIXPERM
t3700-add: create subdirectory gently
add: modify already added files when --chmod is given
read-cache: introduce chmod_index_entry
update-index: add test for chmod flags
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When the chmod option was added to git add, it was hooked up to the diff
machinery, meaning that it only works when the version in the index
differs from the version on disk.
As the option was supposed to mirror the chmod option in update-index,
which always changes the mode in the index, regardless of the status of
the file, make sure the option behaves the same way in git add.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As there are chmod options for both add and update-index, introduce a
new chmod_index_entry function to do the work. Use it in update-index,
while it will be used in add in the next patch.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently there is no test checking the expected behaviour when multiple
chmod flags with different arguments are passed. As argument handling
is not in line with other git commands it's easy to miss and
accidentally change the current behaviour.
While there, fix the argument type of chmod_path, which takes an int,
but had a char passed in.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git checkout <word>" does not follow the usual disambiguation
rules when the <word> can be both a rev and a path, to allow
checking out a branch 'foo' in a project that happens to have a
file 'foo' in the working tree without having to disambiguate.
This was poorly documented and the check was incorrect when the
command was run from a subdirectory.
* nd/checkout-disambiguation:
checkout: fix ambiguity check in subdir
checkout.txt: document a common case that ignores ambiguation rules
checkout: add some spaces between code and comment
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The two functions in parse_branchname_arg(), verify_non_filename and
check_filename, need correct prefix in order to reconstruct the paths
and check for their existence. With NULL prefix, they just check paths
at top dir instead.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In some projects, it is common to use "[RFC PATCH]" as the subject
prefix for a patch meant for discussion rather than application. A
new option "--rfc" was a short-hand for "--subject-prefix=RFC PATCH"
to help the participants of such projects.
* jt/format-patch-rfc:
format-patch: add "--rfc" for the common case of [RFC PATCH]
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Add an alias for --subject-prefix='RFC PATCH', which is used
commonly in some development communities to deserve such a
short-hand.
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Output from "git diff" can be made easier to read by selecting
which lines are common and which lines are added/deleted
intelligently when the lines before and after the changed section
are the same. A command line option is added to help with the
experiment to find a good heuristics.
* mh/diff-indent-heuristic:
blame: honor the diff heuristic options and config
parse-options: add parse_opt_unknown_cb()
diff: improve positioning of add/delete blocks in diffs
xdl_change_compact(): introduce the concept of a change group
recs_match(): take two xrecord_t pointers as arguments
is_blank_line(): take a single xrecord_t as argument
xdl_change_compact(): only use heuristic if group can't be matched
xdl_change_compact(): fix compaction heuristic to adjust ixo
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Teach "git blame" and "git annotate" the --compaction-heuristic and
--indent-heuristic options that are now supported by "git diff".
Also teach them to honor the `diff.compactionHeuristic` and
`diff.indentHeuristic` configuration options.
It would be conceivable to introduce separate configuration options for
"blame" and "annotate"; for example `blame.compactionHeuristic` and
`blame.indentHeuristic`. But it would be confusing to users if blame
output is inconsistent with diff output, so it makes more sense for them
to respect the same configuration.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* rs/cocci:
use strbuf_addstr() for adding constant strings to a strbuf, part 2
add coccicheck make target
contrib/coccinelle: fix semantic patch for oid_to_hex_r()
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Replace uses of strbuf_addf() for adding strings with more lightweight
strbuf_addstr() calls. This makes the intent clearer and avoids
potential issues with printf format specifiers.
02962d36845b89145cd69f8bc65e015d78ae3434 already converted six cases,
this patch covers eleven more.
A semantic patch for Coccinelle is included for easier checking for
new cases that might be introduced in the future.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git gc --aggressive" used to limit the delta-chain length to 250,
which is way too deep for gaining additional space savings and is
detrimental for runtime performance. The limit has been reduced to
50.
* jk/reduce-gc-aggressive-depth:
gc: default aggressive depth to 50
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This commit message is long and has lots of background and
numbers. The summary is: the current default of 250 doesn't
save much space, and costs CPU. It's not a good tradeoff.
Read on for details.
The "--aggressive" flag to git-gc does three things:
1. use "-f" to throw out existing deltas and recompute from
scratch
2. use "--window=250" to look harder for deltas
3. use "--depth=250" to make longer delta chains
Items (1) and (2) are good matches for an "aggressive"
repack. They ask the repack to do more computation work in
the hopes of getting a better pack. You pay the costs during
the repack, and other operations see only the benefit.
Item (3) is not so clear. Allowing longer chains means fewer
restrictions on the deltas, which means potentially finding
better ones and saving some space. But it also means that
operations which access the deltas have to follow longer
chains, which affects their performance. So it's a tradeoff,
and it's not clear that the tradeoff is even a good one.
The existing "250" numbers for "--aggressive" come
originally from this thread:
http://public-inbox.org/git/alpine.LFD.0.9999.0712060803430.13796@woody.linux-foundation.org/
where Linus says:
So when I said "--depth=250 --window=250", I chose those
numbers more as an example of extremely aggressive
packing, and I'm not at all sure that the end result is
necessarily wonderfully usable. It's going to save disk
space (and network bandwidth - the delta's will be re-used
for the network protocol too!), but there are definitely
downsides too, and using long delta chains may
simply not be worth it in practice.
There are some numbers in that thread, but they're mostly
focused on the improved window size, and measure the
improvement from --depth=250 and --window=250 together.
E.g.:
http://public-inbox.org/git/9e4733910712062006l651571f3w7f76ce64c6650dff@mail.gmail.com/
talks about the improved run-time of "git-blame", which
comes from the reduced pack size. But most of that reduction
is coming from --window=250, whereas most of the extra costs
come from --depth=250. There's a link in that thread showing
that increasing the depth beyond 50 doesn't seem to help
much with the size:
https://vcscompare.blogspot.com/2008/06/git-repack-parameters.html
but again, no discussion of the timing impact.
In an earlier thread from Ted Ts'o which discussed setting
the non-aggressive default (from 10 to 50):
http://public-inbox.org/git/20070509134958.GA21489%40thunk.org/
we have more numbers, with the conclusion that going past 50
does not help size much, and hurts the speed of normal
operations.
So from that, we might guess that 50 is actually a sweet
spot, even for aggressive, if we interpret aggressive to
"spend time now to make a better pack". It is not clear that
"--depth=250" is actually a better pack. It may be slightly
_smaller_, but it carries a run-time penalty.
Here are some more recent timings I did to verify that. They
show three things:
- the size of the resulting pack (so disk saved to store,
bandwidth saved on clones/fetches)
- the cost of "rev-list --objects --all", which shows the
effect of the delta chains on trees (commits typically
don't delta, and the command doesn't touch the blobs at
all)
- the cost of "log -Sfoo", which will additionally access
each blob
All cases were repacked with "git repack -adf --depth=$d
--window=250" (so basically, what would happen if we tweaked
the "gc --aggressive" default depth).
The timings are all wall-clock best-of-3. The machine itself
has plenty of RAM compared to the repositories (which is
probably typical of most workstations these days), so we're
really measuring CPU usage, as the whole thing will be in
disk cache after the first run.
The core.deltaBaseCacheLimit is at its default of 96MiB.
It's possible that tweaking it would have some impact on the
tests, as some of them (especially "log -S" on a large repo)
are likely to overflow that. But bumping that carries a
run-time memory cost, so for these tests, I focused on what
we could do just with the on-disk pack tradeoffs.
Each test is done for four depths: 250 (the current value),
50 (the current default that tested well previously), 100
(to show something on the larger side, which previous tests
showed was not a good tradeoff), and 10 (the very old
default, which previous tests showed was worse than 50).
Here are the numbers for linux.git:
depth | size | % | rev-list | % | log -Sfoo | %
-------+-------+-------+----------+--------+-----------+-------
250 | 967MB | n/a | 48.159s | n/a | 378.088 | n/a
100 | 971MB | +0.4% | 41.471s | -13.9% | 342.060 | -9.5%
50 | 979MB | +1.2% | 37.778s | -21.6% | 311.040s | -17.7%
10 | 1.1GB | +6.6% | 32.518s | -32.5% | 279.890s | -25.9%
and for git.git:
depth | size | % | rev-list | % | log -Sfoo | %
-------+-------+-------+----------+--------+-----------+-------
250 | 48MB | n/a | 2.215s | n/a | 20.922s | n/a
100 | 49MB | +0.5% | 2.140s | -3.4% | 17.736s | -15.2%
50 | 49MB | +1.7% | 2.099s | -5.2% | 15.418s | -26.3%
10 | 53MB | +9.3% | 2.001s | -9.7% | 12.677s | -39.4%
You can see that that the CPU savings for regular operations improves as we
decrease the depth. The savings are less for "rev-list" on a smaller repository
than they are for blob-accessing operations, or even rev-list on a larger
repository. This may mean that a larger delta cache would help (though setting
core.deltaBaseCacheLimit by itself doesn't).
But we can also see that the space savings are not that great as the depth goes
higher. Saving 5-10% between 10 and 50 is probably worth the CPU tradeoff.
Saving 1% to go from 50 to 100, or another 0.5% to go from 100 to 250 is
probably not.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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More i18n.
* va/i18n:
i18n: update-index: mark warnings for translation
i18n: show-branch: mark plural strings for translation
i18n: show-branch: mark error messages for translation
i18n: receive-pack: mark messages for translation
notes: spell first word of error messages in lowercase
i18n: notes: mark error messages for translation
i18n: merge-recursive: mark verbose message for translation
i18n: merge-recursive: mark error messages for translation
i18n: config: mark error message for translation
i18n: branch: mark option description for translation
i18n: blame: mark error messages for translation
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Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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