jj/lib/tests/test_commit_concurrent.rs

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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::cmp::max;
use std::thread;
use jujutsu_lib::repo::ReadonlyRepo;
use jujutsu_lib::{dag_walk, testutils};
use test_case::test_case;
fn count_non_merge_operations(repo: &ReadonlyRepo) -> usize {
let op_store = repo.op_store();
let op_id = repo.op_id().clone();
let mut num_ops = 0;
for op_id in dag_walk::bfs(
vec![op_id],
Box::new(|op_id| op_id.clone()),
Box::new(|op_id| op_store.read_operation(op_id).unwrap().parents),
) {
if op_store.read_operation(&op_id).unwrap().parents.len() <= 1 {
num_ops += 1;
}
}
num_ops
}
#[test_case(false ; "local store")]
#[test_case(true ; "git store")]
fn test_commit_parallel(use_git: bool) {
// This loads a Repo instance and creates and commits many concurrent
// transactions from it. It then reloads the repo. That should merge all the
// operations and all commits should be visible.
let settings = testutils::user_settings();
let (_temp_dir, repo) = testutils::init_repo(&settings, use_git);
let num_threads = max(num_cpus::get(), 4);
let mut threads = vec![];
for _ in 0..num_threads {
let settings = settings.clone();
let repo = repo.clone();
let handle = thread::spawn(move || {
testutils::create_random_commit(&settings, &repo)
.write_to_new_transaction(&repo, "test");
});
threads.push(handle);
}
for thread in threads {
thread.join().ok().unwrap();
}
let repo = repo.reload();
// One commit per thread plus the commit from the initial checkout on top of the
// root commit
assert_eq!(repo.view().heads().len(), num_threads + 1);
// One operation for initializing the repo (containing the root id and the
// initial working copy commit).
assert_eq!(count_non_merge_operations(&repo), num_threads + 1);
}
#[test_case(false ; "local store")]
#[test_case(true ; "git store")]
fn test_commit_parallel_instances(use_git: bool) {
// Like the test above but creates a new repo instance for every thread, which
// makes it behave very similar to separate processes.
let settings = testutils::user_settings();
let (_temp_dir, repo) = testutils::init_repo(&settings, use_git);
let num_threads = max(num_cpus::get(), 4);
let mut threads = vec![];
for _ in 0..num_threads {
let settings = settings.clone();
let repo = ReadonlyRepo::load(&settings, repo.working_copy_path().clone()).unwrap();
let handle = thread::spawn(move || {
testutils::create_random_commit(&settings, &repo)
.write_to_new_transaction(&repo, "test");
});
threads.push(handle);
}
for thread in threads {
thread.join().ok().unwrap();
}
// One commit per thread plus the commit from the initial checkout on top of the
// root commit
let repo = ReadonlyRepo::load(&settings, repo.working_copy_path().clone()).unwrap();
assert_eq!(repo.view().heads().len(), num_threads + 1);
// One operation for initializing the repo (containing the root id and the
// initial working copy commit).
assert_eq!(count_non_merge_operations(&repo), num_threads + 1);
}