* [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
@ 2019-08-21 19:18 Derrick Stolee via GitGitGadget
2019-08-21 19:18 ` [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens" Derrick Stolee via GitGitGadget
` (3 more replies)
0 siblings, 4 replies; 11+ messages in thread
From: Derrick Stolee via GitGitGadget @ 2019-08-21 19:18 UTC (permalink / raw)
To: git; +Cc: pclouds, git, Junio C Hamano
As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo. This
was an intentional change when writing the "git switch" builtin. Here is the
commit message for 65f099b ("switch: no worktree status unless real branch
switch happens" 2019-03-29):
When we switch from one branch to another, it makes sense to show a
summary of local changes since there could be conflicts, or some files
left modified.... When switch is used solely for creating a new
branch (and "switch" to the same commit) or detaching, we don't really
need to show anything.
"git checkout" does it anyway for historical reasons. But we can start
with a clean slate with switch and don't have to.
This essentially reverts fa655d8411 (checkout: optimize "git checkout
-b <new_branch>" - 2018-08-16) and make it default for switch,
but also for -B and --detach. Users of big repos are encouraged to
move to switch.
I was considering doing a full, long-term revert of this change to get the
performance back to normal, but I also saw this feedback on the list for
this patch:
I like this last bit. The skip_merge_working_tree() function which
this removes was ugly, difficult to maintain, and difficult to get
just right (and easy to break -- even by changing parts of the system
which one might not expect to impact it).
So, the goal is to reduce the complication given by
skip_merge_working_tree() by recommending that users use 'git switch -c'.
The only problem is: users will take a while to move, unless prompted.
This series does the following:
1. Reverts the change that makes 'git checkout -b' slow again.
2. Creates a warning that recommends users start using 'git switch -c'
instead.
This allows us to strip out this performance feature after users have had
time to adopt the new way of doing things.
Derrick Stolee (2):
Revert "switch: no worktree status unless real branch switch happens"
DEPRECATION: warn about 'git checkout -b'
Documentation/config/checkout.txt | 8 ++
builtin/checkout.c | 130 +++++++++++++++++++++++++++++-
t/t1090-sparse-checkout-scope.sh | 14 ++++
3 files changed, 150 insertions(+), 2 deletions(-)
base-commit: 5fa0f5238b0cd46cfe7f6fa76c3f526ea98148d9
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-317%2Fderrickstolee%2Frevert-switch-slow-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-317/derrickstolee/revert-switch-slow-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/317
--
gitgitgadget
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens"
2019-08-21 19:18 [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b' Derrick Stolee via GitGitGadget
@ 2019-08-21 19:18 ` Derrick Stolee via GitGitGadget
2019-08-21 22:15 ` SZEDER Gábor
2019-08-21 19:18 ` [PATCH 2/2] DEPRECATION: warn about 'git checkout -b' Derrick Stolee via GitGitGadget
` (2 subsequent siblings)
3 siblings, 1 reply; 11+ messages in thread
From: Derrick Stolee via GitGitGadget @ 2019-08-21 19:18 UTC (permalink / raw)
To: git; +Cc: pclouds, git, Junio C Hamano, Derrick Stolee
From: Derrick Stolee <dstolee@microsoft.com>
This reverts commit 65f099b3988198f0fdf3ef7a21dc01c556d21fff, which
removed logic for avoiding extra cost in "git checkout -b" in favor
of the new "git switch -c". This will cause a performance issue for
users in large repos.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
Documentation/config/checkout.txt | 8 ++
builtin/.checkout.c.swp | Bin 0 -> 77824 bytes
builtin/checkout.c | 133 ++++++++++++++++++++++++++++--
t/t1090-sparse-checkout-scope.sh | 14 ++++
4 files changed, 148 insertions(+), 7 deletions(-)
create mode 100644 builtin/.checkout.c.swp
diff --git a/Documentation/config/checkout.txt b/Documentation/config/checkout.txt
index 6b646813ab..d6872ffa83 100644
--- a/Documentation/config/checkout.txt
+++ b/Documentation/config/checkout.txt
@@ -16,3 +16,11 @@ will checkout the '<something>' branch on another remote,
and by linkgit:git-worktree[1] when 'git worktree add' refers to a
remote branch. This setting might be used for other checkout-like
commands or functionality in the future.
+
+checkout.optimizeNewBranch::
+ Optimizes the performance of "git checkout -b <new_branch>" when
+ using sparse-checkout. When set to true, git will not update the
+ repo based on the current sparse-checkout settings. This means it
+ will not update the skip-worktree bit in the index nor add/remove
+ files in the working directory to reflect the current sparse checkout
+ settings nor will it show the local changes.
diff --git a/builtin/.checkout.c.swp b/builtin/.checkout.c.swp
new file mode 100644
index 0000000000000000000000000000000000000000..f6dad4abb02c265ee66b3f6f76d00d59b9b524a4
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HcmV?d00001
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 6123f732a2..f894b9de1a 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -27,6 +27,8 @@
#include "wt-status.h"
#include "xdiff-interface.h"
+static int checkout_optimize_new_branch;
+
static const char * const checkout_usage[] = {
N_("git checkout [<options>] <branch>"),
N_("git checkout [<options>] [<branch>] -- <file>..."),
@@ -71,6 +73,11 @@ struct checkout_opts {
const char *ignore_unmerged_opt;
int ignore_unmerged;
+ /*
+ * If new checkout options are added, skip_merge_working_tree
+ * should be updated accordingly.
+ */
+
const char *new_branch;
const char *new_branch_force;
const char *new_orphan_branch;
@@ -637,6 +644,112 @@ static void setup_branch_path(struct branch_info *branch)
branch->path = strbuf_detach(&buf, NULL);
}
+/*
+ * Skip merging the trees, updating the index and working directory if and
+ * only if we are creating a new branch via "git checkout -b <new_branch>."
+ */
+static int skip_merge_working_tree(const struct checkout_opts *opts,
+ const struct branch_info *old_branch_info,
+ const struct branch_info *new_branch_info)
+{
+ /*
+ * Do the merge if sparse checkout is on and the user has not opted in
+ * to the optimized behavior
+ */
+ if (core_apply_sparse_checkout && !checkout_optimize_new_branch)
+ return 0;
+
+ /*
+ * We must do the merge if we are actually moving to a new commit.
+ */
+ if (!old_branch_info->commit || !new_branch_info->commit ||
+ !oideq(&old_branch_info->commit->object.oid,
+ &new_branch_info->commit->object.oid))
+ return 0;
+
+ /*
+ * opts->patch_mode cannot be used with switching branches so is
+ * not tested here
+ */
+
+ /*
+ * opts->quiet only impacts output so doesn't require a merge
+ */
+
+ /*
+ * Honor the explicit request for a three-way merge or to throw away
+ * local changes
+ */
+ if (opts->merge || opts->force)
+ return 0;
+
+ /*
+ * --detach is documented as "updating the index and the files in the
+ * working tree" but this optimization skips those steps so fall through
+ * to the regular code path.
+ */
+ if (opts->force_detach)
+ return 0;
+
+ /*
+ * opts->writeout_stage cannot be used with switching branches so is
+ * not tested here
+ */
+
+ /*
+ * Honor the explicit ignore requests
+ */
+ if (!opts->overwrite_ignore || opts->ignore_skipworktree ||
+ opts->ignore_other_worktrees)
+ return 0;
+
+ /*
+ * opts->show_progress only impacts output so doesn't require a merge
+ */
+
+ /*
+ * opts->overlay_mode cannot be used with switching branches so is
+ * not tested here
+ */
+
+ /*
+ * If we aren't creating a new branch any changes or updates will
+ * happen in the existing branch. Since that could only be updating
+ * the index and working directory, we don't want to skip those steps
+ * or we've defeated any purpose in running the command.
+ */
+ if (!opts->new_branch)
+ return 0;
+
+ /*
+ * new_branch_force is defined to "create/reset and checkout a branch"
+ * so needs to go through the merge to do the reset
+ */
+ if (opts->new_branch_force)
+ return 0;
+
+ /*
+ * A new orphaned branch requrires the index and the working tree to be
+ * adjusted to <start_point>
+ */
+ if (opts->new_orphan_branch)
+ return 0;
+
+ /*
+ * Remaining variables are not checkout options but used to track state
+ */
+
+ /*
+ * Do the merge if this is the initial checkout. We cannot use
+ * is_cache_unborn() here because the index hasn't been loaded yet
+ * so cache_nr and timestamp.sec are always zero.
+ */
+ if (!file_exists(get_index_file()))
+ return 0;
+
+ return 1;
+}
+
static int merge_working_tree(const struct checkout_opts *opts,
struct branch_info *old_branch_info,
struct branch_info *new_branch_info,
@@ -1020,7 +1133,6 @@ static int switch_branches(const struct checkout_opts *opts,
void *path_to_free;
struct object_id rev;
int flag, writeout_error = 0;
- int do_merge = 1;
trace2_cmd_mode("branch");
@@ -1039,7 +1151,6 @@ static int switch_branches(const struct checkout_opts *opts,
BUG("'switch --orphan' should never accept a commit as starting point");
new_branch_info->commit = NULL;
new_branch_info->name = "(empty)";
- do_merge = 1;
}
if (!new_branch_info->name) {
@@ -1048,12 +1159,16 @@ static int switch_branches(const struct checkout_opts *opts,
if (!new_branch_info->commit)
die(_("You are on a branch yet to be born"));
parse_commit_or_die(new_branch_info->commit);
-
- if (opts->only_merge_on_switching_branches)
- do_merge = 0;
}
- if (do_merge) {
+ /* optimize the "checkout -b <new_branch> path */
+ if (skip_merge_working_tree(opts, &old_branch_info, new_branch_info)) {
+ if (!checkout_optimize_new_branch && !opts->quiet) {
+ if (read_cache_preload(NULL) < 0)
+ return error(_("index file corrupt"));
+ show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
+ }
+ } else {
ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
if (ret) {
free(path_to_free);
@@ -1073,6 +1188,11 @@ static int switch_branches(const struct checkout_opts *opts,
static int git_checkout_config(const char *var, const char *value, void *cb)
{
+ if (!strcmp(var, "checkout.optimizenewbranch")) {
+ checkout_optimize_new_branch = git_config_bool(var, value);
+ return 0;
+ }
+
if (!strcmp(var, "diff.ignoresubmodules")) {
struct checkout_opts *opts = cb;
handle_ignore_submodules_arg(&opts->diff_options, value);
@@ -1747,7 +1867,6 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
opts.accept_ref = 1;
opts.accept_pathspec = 0;
opts.switch_branch_doing_nothing_is_ok = 0;
- opts.only_merge_on_switching_branches = 1;
opts.implicit_detach = 0;
opts.can_switch_when_in_progress = 0;
opts.orphan_from_empty_tree = 1;
diff --git a/t/t1090-sparse-checkout-scope.sh b/t/t1090-sparse-checkout-scope.sh
index 40cc004326..090b7fc3d3 100755
--- a/t/t1090-sparse-checkout-scope.sh
+++ b/t/t1090-sparse-checkout-scope.sh
@@ -31,6 +31,20 @@ test_expect_success 'perform sparse checkout of master' '
test_path_is_file c
'
+test_expect_success 'checkout -b checkout.optimizeNewBranch interaction' '
+ cp .git/info/sparse-checkout .git/info/sparse-checkout.bak &&
+ test_when_finished "
+ mv -f .git/info/sparse-checkout.bak .git/info/sparse-checkout
+ git checkout master
+ " &&
+ echo "/b" >>.git/info/sparse-checkout &&
+ test "$(git ls-files -t b)" = "S b" &&
+ git -c checkout.optimizeNewBranch=true checkout -b fast &&
+ test "$(git ls-files -t b)" = "S b" &&
+ git checkout -b slow &&
+ test "$(git ls-files -t b)" = "H b"
+'
+
test_expect_success 'merge feature branch into sparse checkout of master' '
git merge feature &&
test_path_is_file a &&
--
gitgitgadget
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/2] DEPRECATION: warn about 'git checkout -b'
2019-08-21 19:18 [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b' Derrick Stolee via GitGitGadget
2019-08-21 19:18 ` [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens" Derrick Stolee via GitGitGadget
@ 2019-08-21 19:18 ` Derrick Stolee via GitGitGadget
2019-08-22 3:03 ` Elijah Newren
2019-08-21 22:31 ` [PATCH 0/2] [RFC] Revert/delay performance regression in " SZEDER Gábor
2019-08-22 3:16 ` Elijah Newren
3 siblings, 1 reply; 11+ messages in thread
From: Derrick Stolee via GitGitGadget @ 2019-08-21 19:18 UTC (permalink / raw)
To: git; +Cc: pclouds, git, Junio C Hamano, Derrick Stolee
From: Derrick Stolee <dstolee@microsoft.com>
Recommend that users use 'git switch -c' instead.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
builtin/.checkout.c.swp | Bin 77824 -> 0 bytes
builtin/checkout.c | 9 ++++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
delete mode 100644 builtin/.checkout.c.swp
diff --git a/builtin/.checkout.c.swp b/builtin/.checkout.c.swp
deleted file mode 100644
index f6dad4abb02c265ee66b3f6f76d00d59b9b524a4..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001
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z;e*H-q}3wo)%Vk^Az3wAX0D8*_-Xm2;bjA!(b9{Fie~D|^M^QE4*_;U;Ov3Uih=~~
zGx3%KUnvCmd=VijmgSwTT~CH&BEdQpgD<u4{D5r~1K32-oNV}l8l7L9qS>GVq{aeG
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zkOgB$=!Xmii#n2FhlJ-=O!caG*kmxydWY1stUsY)ql)phcEVn9<uKRruyN7aGu+1D
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zT-JRS9<8YULTxi~vsaZ*N{O&Vt;y-(k2pN*2km)I(_sMn#=>gLMpWBk3+C;lob3&E
zJXquqO>9<E`><wVZRka|=GDMpIy!E^fN#g)X)9Ib<g@LBC;G_VudBtOF^RUlA%m`o
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z&UIwd6`Reb=U2~@*<$8UM^tbG4SB;E8|=k=mdJ36_(ny1`_U`Aw#t(vkd$tnJr>(c
zWPr3vGXN|9gOh=cP^rx`k|1MZ<k$vF)B`=|O_p{qjFF|_$%zME*($*@Vl90u)i?{g
zM{KO(T>aouK0G95w-VWEozN_2QiYkzE){GAFoUA(P`GQ1GJ7)&QvY{#-G|dxmOt+|
z5kTT1t`?$OM81CR!_p%<X+xS>>w||#^s0-67P`>VYp@o`n27V7_%rD)zF?DG5|Zq&
zPrH>5QuNoDy<R-E6Z(dbgX7e+4pe>y8y@OXO+Vvju8TQd2RxGQ7^x!TuE1=%(;LyY
Ul^dyn{$I$!_h?IFGP36X2Rz^&;s5{u
diff --git a/builtin/checkout.c b/builtin/checkout.c
index f894b9de1a..32c8edccaf 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1133,6 +1133,7 @@ static int switch_branches(const struct checkout_opts *opts,
void *path_to_free;
struct object_id rev;
int flag, writeout_error = 0;
+ int do_merge = 1;
trace2_cmd_mode("branch");
@@ -1159,15 +1160,20 @@ static int switch_branches(const struct checkout_opts *opts,
if (!new_branch_info->commit)
die(_("You are on a branch yet to be born"));
parse_commit_or_die(new_branch_info->commit);
+
+ if (opts->only_merge_on_switching_branches)
+ do_merge = 0;
}
/* optimize the "checkout -b <new_branch> path */
- if (skip_merge_working_tree(opts, &old_branch_info, new_branch_info)) {
+ if (!do_merge || skip_merge_working_tree(opts, &old_branch_info, new_branch_info)) {
if (!checkout_optimize_new_branch && !opts->quiet) {
if (read_cache_preload(NULL) < 0)
return error(_("index file corrupt"));
show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
}
+ if (!opts->only_merge_on_switching_branches)
+ warning(_("'git checkout -b <new-branch>' is being deprecated in favor of 'git switch -c <new-branch>'. Please adjust your workflow accordingly."));
} else {
ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
if (ret) {
@@ -1867,6 +1873,7 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
opts.accept_ref = 1;
opts.accept_pathspec = 0;
opts.switch_branch_doing_nothing_is_ok = 0;
+ opts.only_merge_on_switching_branches = 1;
opts.implicit_detach = 0;
opts.can_switch_when_in_progress = 0;
opts.orphan_from_empty_tree = 1;
--
gitgitgadget
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens"
2019-08-21 19:18 ` [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens" Derrick Stolee via GitGitGadget
@ 2019-08-21 22:15 ` SZEDER Gábor
2019-08-22 13:41 ` Derrick Stolee
0 siblings, 1 reply; 11+ messages in thread
From: SZEDER Gábor @ 2019-08-21 22:15 UTC (permalink / raw)
To: Derrick Stolee via GitGitGadget
Cc: git, pclouds, git, Junio C Hamano, Derrick Stolee
On Wed, Aug 21, 2019 at 12:18:33PM -0700, Derrick Stolee via GitGitGadget wrote:
> This reverts commit 65f099b3988198f0fdf3ef7a21dc01c556d21fff, which
> removed logic for avoiding extra cost in "git checkout -b" in favor
> of the new "git switch -c". This will cause a performance issue for
> users in large repos.
It always makes me sad when I see a pull request, where all the
relevant information is only included in the PR, which will not be
part of the history, but not in the commit messages...
> builtin/.checkout.c.swp | Bin 0 -> 77824 bytes
> diff --git a/builtin/.checkout.c.swp b/builtin/.checkout.c.swp
> new file mode 100644
> index 0000000000000000000000000000000000000000..f6dad4abb02c265ee66b3f6f76d00d59b9b524a4
> GIT binary patch
> literal 77824
> zcmeIb37F(pRrf#a46<X03c_z1GgCe3>dYjdA(>2=r6*}KnI2}zLK2GV?&_Y(bXPT1
> z)icux34uRC00rR{;pJ5jL_ico7FiV85d;D8CG1O3By6%HioE<k-*fK$ZB^AXi9sKq
Uh-oh.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
2019-08-21 19:18 [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b' Derrick Stolee via GitGitGadget
2019-08-21 19:18 ` [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens" Derrick Stolee via GitGitGadget
2019-08-21 19:18 ` [PATCH 2/2] DEPRECATION: warn about 'git checkout -b' Derrick Stolee via GitGitGadget
@ 2019-08-21 22:31 ` SZEDER Gábor
2019-08-22 3:18 ` Elijah Newren
2019-08-22 13:43 ` Derrick Stolee
2019-08-22 3:16 ` Elijah Newren
3 siblings, 2 replies; 11+ messages in thread
From: SZEDER Gábor @ 2019-08-21 22:31 UTC (permalink / raw)
To: Derrick Stolee via GitGitGadget; +Cc: git, pclouds, git, Junio C Hamano
On Wed, Aug 21, 2019 at 12:18:32PM -0700, Derrick Stolee via GitGitGadget wrote:
> As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
> checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo.
Does this slowdown only affect the Windows OS repo with VFS for Git,
or other biggish repos without VFS for Git as well?
> This series does the following:
>
> 1. Reverts the change that makes 'git checkout -b' slow again.
> 2. Creates a warning that recommends users start using 'git switch -c'
> instead.
'git help switch' says loudly and clearly that "THIS COMMAND IS
EXPERIMENTAL. THE BEHAVIOR MAY CHANGE." It's too early to recommend
it this aggressively, and to deprecate any parts of 'git checkout'.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] DEPRECATION: warn about 'git checkout -b'
2019-08-21 19:18 ` [PATCH 2/2] DEPRECATION: warn about 'git checkout -b' Derrick Stolee via GitGitGadget
@ 2019-08-22 3:03 ` Elijah Newren
0 siblings, 0 replies; 11+ messages in thread
From: Elijah Newren @ 2019-08-22 3:03 UTC (permalink / raw)
To: Derrick Stolee via GitGitGadget
Cc: Git Mailing List, Nguyễn Thái Ngọc,
Jeff Hostetler, Junio C Hamano, Derrick Stolee
On Wed, Aug 21, 2019 at 12:21 PM Derrick Stolee via GitGitGadget
<gitgitgadget@gmail.com> wrote:
>
> From: Derrick Stolee <dstolee@microsoft.com>
>
> Recommend that users use 'git switch -c' instead.
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> builtin/.checkout.c.swp | Bin 77824 -> 0 bytes
> builtin/checkout.c | 9 ++++++++-
> 2 files changed, 8 insertions(+), 1 deletion(-)
> delete mode 100644 builtin/.checkout.c.swp
>
> diff --git a/builtin/.checkout.c.swp b/builtin/.checkout.c.swp
> deleted file mode 100644
> index f6dad4abb02c265ee66b3f6f76d00d59b9b524a4..0000000000000000000000000000000000000000
> GIT binary patch
> literal 0
> HcmV?d00001
>
> literal 77824
> zcmeIb37F(pRrf#a46<X03c_z1GgCe3>dYjdA(>2=r6*}KnI2}zLK2GV?&_Y(bXPT1
> z)icux34uRC00rR{;pJ5jL_ico7FiV85d;D8CG1O3By6%HioE<k-*fK$ZB^AXi9sKq
> zXXeQ_-ThncdhWSryXQB(>5|Edle5P+t>NE&*Q|N(#aCVRsr$ZX%_F;O)^vOAg+@a+
<snip>
You may want to add a local commit hook that prevents commiting vim
swp files, or adding them to a global excludes file or something. :-)
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
2019-08-21 19:18 [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b' Derrick Stolee via GitGitGadget
` (2 preceding siblings ...)
2019-08-21 22:31 ` [PATCH 0/2] [RFC] Revert/delay performance regression in " SZEDER Gábor
@ 2019-08-22 3:16 ` Elijah Newren
2019-08-22 13:45 ` Derrick Stolee
3 siblings, 1 reply; 11+ messages in thread
From: Elijah Newren @ 2019-08-22 3:16 UTC (permalink / raw)
To: Derrick Stolee via GitGitGadget
Cc: Git Mailing List, Nguyễn Thái Ngọc,
Jeff Hostetler, Junio C Hamano
Hi,
On Wed, Aug 21, 2019 at 12:21 PM Derrick Stolee via GitGitGadget
<gitgitgadget@gmail.com> wrote:
>
> As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
> checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo. This
> was an intentional change when writing the "git switch" builtin. Here is the
> commit message for 65f099b ("switch: no worktree status unless real branch
> switch happens" 2019-03-29):
>
> When we switch from one branch to another, it makes sense to show a
> summary of local changes since there could be conflicts, or some files
> left modified.... When switch is used solely for creating a new
> branch (and "switch" to the same commit) or detaching, we don't really
> need to show anything.
>
> "git checkout" does it anyway for historical reasons. But we can start
> with a clean slate with switch and don't have to.
>
> This essentially reverts fa655d8411 (checkout: optimize "git checkout
> -b <new_branch>" - 2018-08-16) and make it default for switch,
> but also for -B and --detach. Users of big repos are encouraged to
> move to switch.
>
> I was considering doing a full, long-term revert of this change to get the
> performance back to normal, but I also saw this feedback on the list for
> this patch:
>
> I like this last bit. The skip_merge_working_tree() function which
> this removes was ugly, difficult to maintain, and difficult to get
> just right (and easy to break -- even by changing parts of the system
> which one might not expect to impact it).
Instead of restoring this easy-to-break code, could we instead
simplify it and make it more robust? As per the original commit
message, the whole point of the patch is that when you have a huge
index, operations take a while. But in the special case of "git
checkout -b <new_branch>", there's no need to even check the index.
So, we could:
* Check if the user is running "git checkout -b <new_branch>"
* If so, use the performance hack to skip touching the index at all.
This would be much better than what the patch currently does:
* Check if the user has specified -m, if so they clearly didn't just
specify "git checkout -b <new_branch>"
* Check if the user has specified -f, if so they clearly didn't just
specify "git checkout -b <new_branch>"
* Check if the user has specified --detach, if so they clearly
didn't just specify "git checkout -b <new_branch>"
* ...<lots of other similar steps>...
* If we got here, since we've checked all other cases (assuming
other people who have touched checkout remembered to add the necessary
checks for each and every new flag), then by deduction the user must
have specified "git checkout -b <new_branch>", so...
* Use the performance hack to skip touching the index at all.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
2019-08-21 22:31 ` [PATCH 0/2] [RFC] Revert/delay performance regression in " SZEDER Gábor
@ 2019-08-22 3:18 ` Elijah Newren
2019-08-22 13:43 ` Derrick Stolee
1 sibling, 0 replies; 11+ messages in thread
From: Elijah Newren @ 2019-08-22 3:18 UTC (permalink / raw)
To: SZEDER Gábor
Cc: Derrick Stolee via GitGitGadget, Git Mailing List,
Nguyễn Thái Ngọc, Jeff Hostetler, Junio C Hamano
On Wed, Aug 21, 2019 at 5:01 PM SZEDER Gábor <szeder.dev@gmail.com> wrote:
>
> On Wed, Aug 21, 2019 at 12:18:32PM -0700, Derrick Stolee via GitGitGadget wrote:
> > As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
> > checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo.
>
> Does this slowdown only affect the Windows OS repo with VFS for Git,
> or other biggish repos without VFS for Git as well?
It will also affect other biggish repos without VFS for Git; see the
"does not seem to be GFVS-specific in any way" paragraph of
https://public-inbox.org/git/CABPp-BGir_5xyqEfwytDog0rZDydPHXjuqXCpNKk67dVPXjUjA@mail.gmail.com/
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens"
2019-08-21 22:15 ` SZEDER Gábor
@ 2019-08-22 13:41 ` Derrick Stolee
0 siblings, 0 replies; 11+ messages in thread
From: Derrick Stolee @ 2019-08-22 13:41 UTC (permalink / raw)
To: SZEDER Gábor, Derrick Stolee via GitGitGadget
Cc: git, pclouds, git, Junio C Hamano, Derrick Stolee
On 8/21/2019 6:15 PM, SZEDER Gábor wrote:
> On Wed, Aug 21, 2019 at 12:18:33PM -0700, Derrick Stolee via GitGitGadget wrote:
>> This reverts commit 65f099b3988198f0fdf3ef7a21dc01c556d21fff, which
>> removed logic for avoiding extra cost in "git checkout -b" in favor
>> of the new "git switch -c". This will cause a performance issue for
>> users in large repos.
>
> It always makes me sad when I see a pull request, where all the
> relevant information is only included in the PR, which will not be
> part of the history, but not in the commit messages...
An issue with the RFC quality at the moment. I'll do a better job
if we decide to move this direction.
>> builtin/.checkout.c.swp | Bin 0 -> 77824 bytes
>
>> diff --git a/builtin/.checkout.c.swp b/builtin/.checkout.c.swp
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..f6dad4abb02c265ee66b3f6f76d00d59b9b524a4
>> GIT binary patch
>> literal 77824
>> zcmeIb37F(pRrf#a46<X03c_z1GgCe3>dYjdA(>2=r6*}KnI2}zLK2GV?&_Y(bXPT1
>> z)icux34uRC00rR{;pJ5jL_ico7FiV85d;D8CG1O3By6%HioE<k-*fK$ZB^AXi9sKq
>
> Uh-oh.
Whoops! I thought I removed this in time to submit, but I guess I
did not.
-Stolee
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
2019-08-21 22:31 ` [PATCH 0/2] [RFC] Revert/delay performance regression in " SZEDER Gábor
2019-08-22 3:18 ` Elijah Newren
@ 2019-08-22 13:43 ` Derrick Stolee
1 sibling, 0 replies; 11+ messages in thread
From: Derrick Stolee @ 2019-08-22 13:43 UTC (permalink / raw)
To: SZEDER Gábor, Derrick Stolee via GitGitGadget
Cc: git, pclouds, git, Junio C Hamano
On 8/21/2019 6:31 PM, SZEDER Gábor wrote:
> On Wed, Aug 21, 2019 at 12:18:32PM -0700, Derrick Stolee via GitGitGadget wrote:
>> As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
>> checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo.
>
> Does this slowdown only affect the Windows OS repo with VFS for Git,
> or other biggish repos without VFS for Git as well?
>
>> This series does the following:
>>
>> 1. Reverts the change that makes 'git checkout -b' slow again.
>> 2. Creates a warning that recommends users start using 'git switch -c'
>> instead.
>
> 'git help switch' says loudly and clearly that "THIS COMMAND IS
> EXPERIMENTAL. THE BEHAVIOR MAY CHANGE." It's too early to recommend
> it this aggressively, and to deprecate any parts of 'git checkout'.
Even more reason why the performance boost should not have been
removed from 'git checkout -b' so quickly.
Thanks,
-Stolee
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b'
2019-08-22 3:16 ` Elijah Newren
@ 2019-08-22 13:45 ` Derrick Stolee
0 siblings, 0 replies; 11+ messages in thread
From: Derrick Stolee @ 2019-08-22 13:45 UTC (permalink / raw)
To: Elijah Newren, Derrick Stolee via GitGitGadget
Cc: Git Mailing List, Nguyễn Thái Ngọc,
Jeff Hostetler, Junio C Hamano
On 8/21/2019 11:16 PM, Elijah Newren wrote:
> Hi,
>
> On Wed, Aug 21, 2019 at 12:21 PM Derrick Stolee via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>>
>> As we were integrating Git 2.23.0 into VFS for Git, we discovered that "git
>> checkout -b new-branch" went from 0.3s to 10+s on the Windows OS repo. This
>> was an intentional change when writing the "git switch" builtin. Here is the
>> commit message for 65f099b ("switch: no worktree status unless real branch
>> switch happens" 2019-03-29):
>>
>> When we switch from one branch to another, it makes sense to show a
>> summary of local changes since there could be conflicts, or some files
>> left modified.... When switch is used solely for creating a new
>> branch (and "switch" to the same commit) or detaching, we don't really
>> need to show anything.
>>
>> "git checkout" does it anyway for historical reasons. But we can start
>> with a clean slate with switch and don't have to.
>>
>> This essentially reverts fa655d8411 (checkout: optimize "git checkout
>> -b <new_branch>" - 2018-08-16) and make it default for switch,
>> but also for -B and --detach. Users of big repos are encouraged to
>> move to switch.
>>
>> I was considering doing a full, long-term revert of this change to get the
>> performance back to normal, but I also saw this feedback on the list for
>> this patch:
>>
>> I like this last bit. The skip_merge_working_tree() function which
>> this removes was ugly, difficult to maintain, and difficult to get
>> just right (and easy to break -- even by changing parts of the system
>> which one might not expect to impact it).
>
> Instead of restoring this easy-to-break code, could we instead
> simplify it and make it more robust? As per the original commit
> message, the whole point of the patch is that when you have a huge
> index, operations take a while. But in the special case of "git
> checkout -b <new_branch>", there's no need to even check the index.
> So, we could:
>
> * Check if the user is running "git checkout -b <new_branch>"
> * If so, use the performance hack to skip touching the index at all.
>
> This would be much better than what the patch currently does:
>
> * Check if the user has specified -m, if so they clearly didn't just
> specify "git checkout -b <new_branch>"
> * Check if the user has specified -f, if so they clearly didn't just
> specify "git checkout -b <new_branch>"
> * Check if the user has specified --detach, if so they clearly
> didn't just specify "git checkout -b <new_branch>"
> * ...<lots of other similar steps>...
> * If we got here, since we've checked all other cases (assuming
> other people who have touched checkout remembered to add the necessary
> checks for each and every new flag), then by deduction the user must
> have specified "git checkout -b <new_branch>", so...
> * Use the performance hack to skip touching the index at all.
I can look into a simpler implementation of this direction. I'm
getting the feeling that this immediate recommendation of "git switch -c"
is too hasty, so the best thing to do is to create a simpler way
to detect "git checkout -b" and use the fast method.
Thanks,
-Stolee
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2019-08-22 13:45 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-21 19:18 [PATCH 0/2] [RFC] Revert/delay performance regression in 'git checkout -b' Derrick Stolee via GitGitGadget
2019-08-21 19:18 ` [PATCH 1/2] Revert "switch: no worktree status unless real branch switch happens" Derrick Stolee via GitGitGadget
2019-08-21 22:15 ` SZEDER Gábor
2019-08-22 13:41 ` Derrick Stolee
2019-08-21 19:18 ` [PATCH 2/2] DEPRECATION: warn about 'git checkout -b' Derrick Stolee via GitGitGadget
2019-08-22 3:03 ` Elijah Newren
2019-08-21 22:31 ` [PATCH 0/2] [RFC] Revert/delay performance regression in " SZEDER Gábor
2019-08-22 3:18 ` Elijah Newren
2019-08-22 13:43 ` Derrick Stolee
2019-08-22 3:16 ` Elijah Newren
2019-08-22 13:45 ` Derrick Stolee
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