单步调试

用户输入n后，可将运行模式改为单核运行模式，即只有聚焦的核运行，其他核静止。

前提条件

算子编译时，使用--cce-ignore-always-inline=true的编译选项。

操作步骤

将断点打在需要调试的位置，并运行。打断点的具体操作请参见行断点。

(msdebug) r                // 运行
Process 2695700 launched: '${INSTALL_DIR}/projects/reduce_sum/add_tik2_npu' (aarch64)
[Launch of Kernel _Z17reduce_sum_customPhS_S_S_ on Device 0]
Process 2695700 stopped
[Switching to focus on Kernel _Z17reduce_sum_customPhS_S_S_, CoreId 0, Type aiv]
* thread #1, name = 'add_tik2_npu', stop reason = breakpoint 1.1
    frame #0: 0x0000000000001390 device_debugdata`reduce_sum_custom(unsigned char*, unsigned char*, unsigned char*, unsigned char*) [inlined] KernelReduceSum::Compute(this=0x0000000000167258) at reduce_sum_custom.cpp:45:36
   42       }
   43       __aicore__ inline void Compute()
   44       {
-> 45           LocalTensor<half> xLocal = inQueueX.DeQue<half>();  // 断点位置 
   46           LocalTensor<half> yTmpLocal = yTmp.Get<half>();
   47           LocalTensor<half> workTmpLocal = workTmp.Get<half>();
   48           LocalTensor<int32_t> syncTmpLocal = syncTmp.Get<int32_t>();

用户输入n后，msdebug工具将运行模式改为单核运行模式。

(msdebug) n
Process 2695700 stopped
[Switching to focus on Kernel _Z17reduce_sum_customPhS_S_S_, CoreId 0, Type aiv]
* thread #1, name = 'add_tik2_npu', stop reason = step over
//   通过回显可查看pc的位置，表示单步成功
    frame #0: 0x000000000000183c device_debugdata`reduce_sum_custom(unsigned char*, unsigned char*, unsigned char*, unsigned char*) [inlined] KernelReduceSum::Compute(this=0x0000000000167258) at reduce_sum_custom.cpp:46:44
   43       __aicore__ inline void Compute()
   44       {
   45           LocalTensor<half> xLocal = inQueueX.DeQue<half>();
-> 46           LocalTensor<half> yTmpLocal = yTmp.Get<half>();
   47           LocalTensor<half> workTmpLocal = workTmp.Get<half>();
   48           LocalTensor<int32_t> syncTmpLocal = syncTmp.Get<int32_t>();
   49           LocalTensor<half> secondTmpLocal = secondTmp.Get<half>();

输入ascend info cores命令，查看所有核的PC信息和停止原因。

(msdebug) ascend info cores
  CoreId  Type  Device Stream Task Block         PC               stop reason
*   0     aiv      0     47     0     2     0x1240c001c83c         step over             //* 代表当前正在运行的核
    1     aiv      0     47     0     3     0x1240c001c390         breakpoint 1.1  
    2     aiv      0     47     0     4     0x1240c001c390         breakpoint 1.1
    3     aiv      0     47     0     5     0x1240c001c390         breakpoint 1.1
    4     aiv      0     47     0     6     0x1240c001c390         breakpoint 1.1
    5     aiv      0     47     0     7     0x1240c001c390         breakpoint 1.1
   48     aiv      0     47     0     0     0x1240c001c390         breakpoint 1.1
   49     aiv      0     47     0     1     0x1240c001c390         breakpoint 1.1

当前核的停止原因既有单步调试又有断点时，将展示为breakpoint。
若运行程序出现卡顿的现象，可以通过键盘输入“CTRL+C”中断运行程序。运行卡顿的原因可能是以下情况：
- 用户程序本身存在死循环，需要通过修复程序解决。
- 算子使用了表1中的同步类指令。

使用核切换功能，调试其他核。

(msdebug) ascend aiv 2
[Switching to focus on Kernel _Z17reduce_sum_customPhS_S_S_, CoreId 2, Type aiv]
* thread #1, name = 'add_tik2_npu', stop reason = step over
    frame #0: 0x0000000000001390 device_debugdata`reduce_sum_custom(unsigned char*, unsigned char*, unsigned char*, unsigned char*) [inlined] KernelReduceSum::Compute(this=0x000000000016f258) at reduce_sum_custom.cpp:45:36
   42       }
   43       __aicore__ inline void Compute()
   44       {
-> 45           LocalTensor<half> xLocal = inQueueX.DeQue<half>();
   46           LocalTensor<half> yTmpLocal = yTmp.Get<half>();
   47           LocalTensor<half> workTmpLocal = workTmp.Get<half>();
   48           LocalTensor<int32_t> syncTmpLocal = syncTmp.Get<int32_t>();
(msdebug) n
Process 2695700 stopped
[Switching to focus on Kernel _Z17reduce_sum_customPhS_S_S_, CoreId 2, Type aiv]
* thread #1, name = 'add_tik2_npu', stop reason = step over
    frame #0: 0x000000000000183c device_debugdata`reduce_sum_custom(unsigned char*, unsigned char*, unsigned char*, unsigned char*) [inlined] KernelReduceSum::Compute(this=0x000000000016f258) at reduce_sum_custom.cpp:46:44
   43       __aicore__ inline void Compute()
   44       {
   45           LocalTensor<half> xLocal = inQueueX.DeQue<half>();
-> 46           LocalTensor<half> yTmpLocal = yTmp.Get<half>();
   47           LocalTensor<half> workTmpLocal = workTmp.Get<half>();
   48           LocalTensor<int32_t> syncTmpLocal = syncTmp.Get<int32_t>();
   49           LocalTensor<half> secondTmpLocal = secondTmp.Get<half>();
(msdebug) ascend info cores
  CoreId  Type  Device Stream Task Block         PC               stop reason
    0     aiv      0     47     0     2     0x1240c001c83c         step over
    1     aiv      0     47     0     3     0x1240c001c390         breakpoint 1.1
*   2     aiv      0     47     0     4     0x1240c001c83c         step over         // 用户输入n后，stop reason才会展示为stepover
    3     aiv      0     47     0     5     0x1240c001c390         breakpoint 1.1
    4     aiv      0     47     0     6     0x1240c001c390         breakpoint 1.1
    5     aiv      0     47     0     7     0x1240c001c390         breakpoint 1.1
   48     aiv      0     47     0     0     0x1240c001c390         breakpoint 1.1
   49     aiv      0     47     0     1     0x1240c001c390         breakpoint 1.1

调试完以后，执行q命令并输入Y或y结束调试。

(msdebug) q
Quitting LLDB will kill one or more processes. Do you really want to proceed: [Y/n] y

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