1、在客户端工具执行 gs_stack ([tid]) 函数 使用具有 monadmin 或者 sysadmin 用户权限的用户，通过 gsql 或者其他工具连接数据库；
执行命令：
openGuass=# select * from gs_stack();
返回当前 openGauss 所有线程的调用栈： ` tid | lwtid | stack ---------------+------ +------------------------------------------------------------------ 14026731434848 | 2626 | _poll + 0x2d + | | WaitLatch0rSocket (Latch volatile*,int,int,long) + 0x29f + | | WaitLatch (Latch voatile*,int,long) + 0x2e + | | start_thread +oxc5 + | | clone + OXC5 + 140116075071232| 23864 |__poll + 0x2d + | | poll + 0x81 + | | WaitLatchOrSocket (Latch volatile*, int, int, long) + 0x6af + | | WaitLatch (Latch volatile*, int, long) + 0x2e + | | ckpt_pagewriter_sub_thread_loop () + 0x284 + | | ckpt_pagewriter_main () + 0x92e + | | int GaussDbAuxiliaryThreadMain<(knl_thread_role) 46>(knl_thread_arg*) + 0x482 + | | int GaussDbThreadMain<(knl_thread_role) 46>(knl_thread_arg*) + 0x854 + | | InternalThreadFunc (void*) + 0x5c + | | ThreadStarterFunc (void*) + 0xa4 + | | start_thread + 0xc5 + | | clone + 0x6d +
`
只需要查看某一个线程的调用栈时，执行命令：
openGuass=# select gs_stack(xxx);
xxx 为为某个线程的 thread_id，能够返回 thread_id 为 xxx 的线程的调用栈：
` gs_stack
pthread_sigmask + 0x2a + gs_signal_recover_mask(__sigset_t) + 0x17 + gs_signal_send(unsigned long, int, int) + 0x2f9 + signal_child(unsigned long, int, int) + 0x36 + get_stack_according_to_tid(unsigned long, StringInfoData*) + 0x191 + gs_stack(FunctionCallInfoData*) + 0xcb + unsigned long ExecMakeFunctionResult(FuncExprState*, ExprContext*, bool*, ExprDoneCond*) + 0x554 + ExecEvalFunc(FuncExprState*, ExprContext*, bool*, ExprDoneCond*) + 0x147 + ExecTargetList(List*, ExprContext*, unsigned long*, bool*, ExprDoneCond*, ExprDoneCond*) + 0x15d + ExecProject(ProjectionInfo*, ExprDoneCond*) + 0x40f + ExecResult(ResultState*) + 0x1da + ExecResultWrap(PlanState*) + 0x18 + ExecProcNode(PlanState*) + 0xde + ExecutePlan(EState*, PlanState*, CmdType, bool, long, ScanDirection, _DestReceiver*) + 0x1a6 + standard_ExecutorRun(QueryDesc*, ScanDirection, long) + 0x3d9 + explain_ExecutorRun(QueryDesc*, ScanDirection, long) + 0x109 + ExecutorRun(QueryDesc*, ScanDirection, long) + 0x1ad + PortalRunSelect(PortalData*, bool, long, _DestReceiver*) + 0x294 + PortalRun(PortalData*, long, bool, _DestReceiver*, _DestReceiver*, char*) + 0x62e + exec_simple_query(char const*, MessageType, StringInfoData*) + 0x12b0 + PostgresMain(int, char**, char const*, char const*) + 0x2e10 + BackendRun(Port*) + 0x327 + int GaussDbThreadMain<(knl_thread_role)1>(knl_thread_arg*) + 0x5a8 + InternalThreadFunc(void*) + 0x2d + ThreadStarterFunc(void*) + 0xa4 + start_thread + 0xc5 + clone + 0x6d +
`
openGauss=# select gs_stack(140115727259392);
` gs_stack
__select + 0x33 + pg_usleep(long) + 0xa1 + pg_sleep(FunctionCallInfoData*) + 0xeb + unsigned long ExecMakeFunctionResultNoSets(FuncExprState*, ExprContext*, bool*, ExprDoneCond*) + 0x206f + ExecEvalFunc(FuncExprState*, ExprContext*, bool*, ExprDoneCond*) + 0x622 + ExecTargetList(List*, ExprContext*, unsigned long*, bool*, ExprDoneCond*, ExprDoneCond*) + 0x45d + ExecProject(ProjectionInfo*, ExprDoneCond*) + 0xc2d + ExecResult(ResultState*) + 0x79b + ExecResultWrap(PlanState*) + 0x18 + ExecProcNode(PlanState*) + 0x2db + ExecutePlan(EState*, PlanState*, CmdType, bool, long, ScanDirection, _DestReceiver*) + 0x765 + standard_ExecutorRun(QueryDesc*, ScanDirection, long) + 0xbb5 + explain_ExecutorRun(QueryDesc*, ScanDirection, long) + 0x1f7 + ExecutorRun(QueryDesc*, ScanDirection, long) + 0x947 + PortalRunSelect(PortalData*, bool, long, _DestReceiver*) + 0x7d2 + PortalRun(PortalData*, long, bool, _DestReceiver*, _DestReceiver*, char*) + 0xe11 + exec_simple_query(char const*, MessageType, StringInfoData*) + 0x3929 + PostgresMain(int, char**, char const*, char const*) + 0x61f8 + BackendRun(Port*) + 0x64d + int GaussDbThreadMain<(knl_thread_role)1>(knl_thread_arg*) + 0x9c7 + InternalThreadFunc(void*) + 0x5c + ThreadStarterFunc(void*) + 0xa4 + start_thread + 0xc5 + clone + 0x6d +
`
2、在服务器端使用 gs_ctl stack –D data_dir 命令 当线程池满，无法通过 gsql 连接数据库的时候，可以使用 gs_ctl 工具执行命令获取线程调用栈：
使用集群用户登录服务器，执行命令 gs_ctl stack –D data_dir，data_dir 是指定 gaussdb 的数据目录的绝对路径:
gs_ctl stack –D /path/to/install/data/ 1 可以取 gaussdb 所有线程的调用栈。 `[user@euler omm]$ gs_ctl stack -D /path/to/install/data/opengauss [2022-11-03 20:17:59.288][19256][][gs_ctl]: gs_stack start: Thread 0 tid<140120252633600> lwtid<23675> __poll + 0x2d poll + 0x81 CommWaitPollParam::caller(int ()(pollfd, unsigned long, int), unsigned long) + 0xb1 int comm_socket_call)(pollfd, unsigned long, int)>(CommWaitPollParam*, int ()(pollfd, unsigned long, int)) + 0x28 comm_poll(pollfd*, unsigned long, int) + 0x388 ServerLoop() + 0xb77 PostmasterMain(int, char**) + 0x612e main + 0xaeb __libc_start_main + 0xf5 0x55feac9a9907
Thread 1 tid<140116236076800> lwtid<23848> __poll + 0x2d poll + 0x81 WaitLatchOrSocket(Latch volatile*, int, int, long) + 0x6af SysLoggerMain(int) + 0x17c9 int GaussDbThreadMain<(knl_thread_role)17>(knl_thread_arg*) + 0x860 InternalThreadFunc(void*) + 0x5c ThreadStarterFunc(void*) + 0xa4 start_thread + 0xc5 clone + 0x6d
`