> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 如何查看服务器当前正在运行哪些代码？

> ClickHouse 提供了 `system.stack_trace` 等内部信息工具，可用于查看服务器各线程当前正在运行的代码，有助于调试和性能监控。

<div id="check-what-code-is-currently-running-on-a-server">
  ## 检查服务器当前运行的代码
</div>

ClickHouse 内置了调试器和内部信息功能。

例如，你可以通过查询 `system.stack_trace` 表，在运行时获取每台服务器上各线程的堆栈跟踪：

```sql theme={null}
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 ClickHouse 源代码中线程正在运行或等待的位置。 (你需要将 `allow_introspection_functions` 设置为 `1`，以启用[内部信息相关函数](/zh/reference/functions/regular-functions/introspection)。) 响应如下：

```response theme={null}
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.
```

<Note>
  如果你是通过 **.deb/.rpm/.tgz** 安装 ClickHouse 的，也可以安装带调试信息的软件包，以查看源代码中的行号：

  ```bash theme={null}
  sudo apt install clickhouse-common-static-dbg
  ```

  如果你安装的是 ClickHouse 单一二进制版本，则其中已包含调试信息。
</Note>

<Tip>
  如果想了解更概括的信息，可以查看以下这些系统表：

  * [system.processes](/zh/reference/system-tables/processes)
  * [system.query\_log](/zh/reference/system-tables/query_log)
  * [system.metric\_log](/zh/reference/system-tables/metric_log)
  * [system.asynchronous\_metric\_log](/zh/reference/system-tables/asynchronous_metric_log)
  * [system.trace\_log](/zh/reference/system-tables/trace_log)
  * [system.processor\_profile\_log](/zh/reference/system-tables/processors_profile_log)

  此外，[其他系统表](/zh/reference/system-tables) 中也有不少实用信息。
</Tip>