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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/coro/lazy.h>
#include <vespa/vespalib/coro/schedule.h>
#include <vespa/vespalib/coro/completion.h>
#include <vespa/vespalib/coro/active_work.h>
#include <vespa/vespalib/util/time.h>
#include <vespa/vespalib/util/threadstackexecutor.h>
#include <vespa/vespalib/gtest/gtest.h>
#include <cinttypes>
using namespace vespalib;
using namespace vespalib::coro;
Lazy<int> make_expensive_task(Executor &executor, int value) {
co_await schedule(executor);
auto cpu_cost = 20ms;
std::this_thread::sleep_for(cpu_cost);
co_return value;
}
Lazy<int> make_cheap_task(Executor &, int value) {
co_return value;
}
Lazy<int> concurrent_sum(Executor &executor, std::vector<int> values,
std::function<Lazy<int>(Executor &,int)> make_task)
{
std::vector<Lazy<int>> work;
for (int v: values) {
work.push_back(make_task(executor, v));
}
ActiveWork active;
for (auto &task: work) {
active.start(task);
}
co_await active.join();
int res = 0;
for (auto &task: work) {
res += co_await task; // await_ready == true
}
co_return res;
}
TEST(ActiveWorkTest, run_expensive_subtasks_concurrently) {
vespalib::ThreadStackExecutor executor(8);
auto t0 = steady_clock::now();
auto result = sync_wait(concurrent_sum(executor, {1, 2, 3, 4, 5, 6, 7, 8,
9,10,11,12,13,14,15,16},
make_expensive_task));
auto td = steady_clock::now() - t0;
EXPECT_EQ(result, 136);
fprintf(stderr, "time spent: %" PRId64 " ms\n", count_ms(td));
}
TEST(ActiveWorkTest, run_cheap_subtasks_concurrently) {
vespalib::ThreadStackExecutor executor(1);
auto t0 = steady_clock::now();
auto result = sync_wait(concurrent_sum(executor, {1, 2, 3, 4, 5, 6, 7, 8,
9,10,11,12,13,14,15,16},
make_cheap_task));
auto td = steady_clock::now() - t0;
EXPECT_EQ(result, 136);
fprintf(stderr, "time spent: %" PRId64 " ms\n", count_ms(td));
}
GTEST_MAIN_RUN_ALL_TESTS()
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