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如何检查服务器上当前运行的代码？

ClickHouse 提供了诸如 `system.stack_trace` 之类的内省工具，用于检查每个服务器线程上当前运行的代码，有助于调试和性能监控。

检查服务器上当前运行的代码​

ClickHouse 具有内置的调试器和内省功能。

例如，你可以通过查询 system.stack_trace 表来获取每个服务器线程在运行时时的堆栈跟踪。

SELECT
    count(),
    arrayStringConcat(arrayMap(x -> concat(demangle(addressToSymbol(x)), '\n    ', addressToLine(x)), trace), '\n') AS sym
FROM system.stack_trace
GROUP BY trace
ORDER BY count() DESC
LIMIT 10
FORMAT Vertical
SETTINGS allow_introspection_functions = 1;

查询结果将显示线程在 ClickHouse 源代码中运行或等待的位置。（你需要将 allow_introspection_functions 设置为 1 来启用 内省函数。）响应如下所示：

Row 1:
──────
count(): 144
sym:     pthread_cond_wait

DB::BackgroundSchedulePool::threadFunction()
    /usr/bin/clickhouse

    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 2:
──────
count(): 80
sym:     pthread_cond_wait

std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)
    /usr/bin/clickhouse
DB::MergeTreeBackgroundExecutor<DB::OrdinaryRuntimeQueue>::threadFunction()
    /usr/bin/clickhouse
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
    /usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 3:
──────
count(): 55
sym:     pthread_cond_wait

ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
    /usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 4:
──────
count(): 16
sym:

DB::AsynchronousInsertQueue::processBatchDeadlines(unsigned long)
    /usr/bin/clickhouse

    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 5:
──────
count(): 16
sym:     pthread_cond_wait

std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)
    /usr/bin/clickhouse
DB::MergeTreeBackgroundExecutor<DB::MergeMutateRuntimeQueue>::threadFunction()
    /usr/bin/clickhouse
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
    /usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 6:
──────
count(): 10
sym:     poll

Poco::Net::SocketImpl::pollImpl(Poco::Timespan&, int)
    /usr/bin/clickhouse
Poco::Net::SocketImpl::poll(Poco::Timespan const&, int)
    /usr/bin/clickhouse
Poco::Net::TCPServer::run()
    /usr/bin/clickhouse
Poco::ThreadImpl::runnableEntry(void*)
    /usr/bin/clickhouse


clone


Row 7:
──────
count(): 9
sym:     pthread_cond_wait

ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 8:
──────
count(): 7
sym:     poll

Poco::Net::SocketImpl::pollImpl(Poco::Timespan&, int)
    /usr/bin/clickhouse
Poco::Net::SocketImpl::poll(Poco::Timespan const&, int)
    /usr/bin/clickhouse
DB::ReadBufferFromPocoSocket::poll(unsigned long) const
    /usr/bin/clickhouse
DB::TCPHandler::runImpl()
    /usr/bin/clickhouse
DB::TCPHandler::run()
    /usr/bin/clickhouse

    /usr/bin/clickhouse
Poco::Net::TCPServerConnection::start()
    /usr/bin/clickhouse
Poco::Net::TCPServerDispatcher::run()
    /usr/bin/clickhouse
Poco::PooledThread::run()
    /usr/bin/clickhouse
Poco::ThreadImpl::runnableEntry(void*)
    /usr/bin/clickhouse


clone


Row 9:
───────
count(): 3
sym:     pthread_cond_wait

Poco::EventImpl::waitImpl()
    /usr/bin/clickhouse
DB::DDLWorker::runCleanupThread()
    /usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<true>::ThreadFromGlobalPoolImpl<void (DB::DDLWorker::*)(), DB::DDLWorker*>(void (DB::DDLWorker::*&&)(), DB::DDLWorker*&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


Row 10:
───────
count(): 3
sym:     pthread_cond_wait

Poco::EventImpl::waitImpl()
    /usr/bin/clickhouse
DB::DDLWorker::runMainThread()
    /usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<true>::ThreadFromGlobalPoolImpl<void (DB::DDLWorker::*)(), DB::DDLWorker*>(void (DB::DDLWorker::*&&)(), DB::DDLWorker*&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
    /usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
    /usr/bin/clickhouse

    /usr/bin/clickhouse


clone


10 rows in set. Elapsed: 0.026 sec.
注意

如果你从 .deb/.rpm/.tgz 安装了 ClickHouse，你也可以安装包含调试信息的软件包，以查看源代码中的行号。

sudo apt install clickhouse-common-static-dbg

如果你将 ClickHouse 安装为单个二进制文件，它已经包含调试信息。

提示

有关更高级别的信息，请查看以下其他系统表：

并且在 其他系统表 中也有有用的信息。

·阅读时间 3 分钟
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