【备忘】CogVLM2环境搭建2 —— 使用问题，triton无法编译_triton 库出现了问题,似乎是在尝试执行 whereis libcuda.so

背景

如果想看搭建基础环境的，请参考第一篇，虽然环境跑起来了，但是第一通对话就不成功，显示如下问题

/usr/bin/ld: 找不到 -lcuda: 没有那个文件或目录
collect2: error: ld returned 1 exit status
Traceback (most recent call last):
  File "<string>", line 21, in rotary_kernel
KeyError: ('2-.-0-.-0-83ca8b715a9dc5f32dc1110973485f64-d6252949da17ceb5f3a278a70250af13-1af5134066c618146d2cd009138944a0-e177f815e3215f52f6b30ce0392b4ae7-3498c340fd4b6ee7805fd54b882a04f5-e1f133f98d04093da2078dfc51c36b72-b26258bf01f839199e39d64851821f26-d7c06e3b46e708006c15224aac7a1378-f585402118c8a136948ce0a49cfe122c', (torch.bfloat16, torch.bfloat16, torch.bfloat16, torch.bfloat16, None, 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32', 'i32'), (128, False, False, False, False, 4), (True, True, True, True, (False,), (True, False), (False, False), (True, False), (True, False), (False, False), (False, False), (True, False), (True, False), (True, False), (False, True), (True, False), (True, False), (True, False), (False, True)))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/think/CogVLM2-main/basic_demo/cli_demo.py", line 102, in <module>
    outputs = model.generate(**inputs, **gen_kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/utils/_contextlib.py", line 115, in decorate_context
    return func(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/transformers/generation/utils.py", line 1622, in generate
    result = self._sample(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/transformers/generation/utils.py", line 2791, in _sample
    outputs = self(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1501, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/accelerate/hooks.py", line 169, in new_forward
    output = module._old_forward(*args, **kwargs)
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/modeling_cogvlm.py", line 620, in forward
    outputs = self.model(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1501, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/accelerate/hooks.py", line 169, in new_forward
    output = module._old_forward(*args, **kwargs)
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/modeling_cogvlm.py", line 402, in forward
    return self.llm_forward(
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/modeling_cogvlm.py", line 486, in llm_forward
    layer_outputs = decoder_layer(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1501, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/accelerate/hooks.py", line 169, in new_forward
    output = module._old_forward(*args, **kwargs)
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/modeling_cogvlm.py", line 261, in forward
    hidden_states, self_attn_weights, present_key_value = self.self_attn(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1501, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/accelerate/hooks.py", line 169, in new_forward
    output = module._old_forward(*args, **kwargs)
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/modeling_cogvlm.py", line 204, in forward
    query_states, key_states = self.rotary_emb(query_states, key_states, position_ids=position_ids, max_seqlen=position_ids.max() + 1)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1501, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/accelerate/hooks.py", line 169, in new_forward
    output = module._old_forward(*args, **kwargs)
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/util.py", line 469, in forward
    q = apply_rotary_emb_func(
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/util.py", line 329, in apply_rotary_emb
    return ApplyRotaryEmb.apply(
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/torch/autograd/function.py", line 506, in apply
    return super().apply(*args, **kwargs)  # type: ignore[misc]
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/util.py", line 255, in forward
    out = apply_rotary(
  File "/home/think/.cache/huggingface/modules/transformers_modules/cogvlm2-llama3-chinese-chat-19B-int4/util.py", line 212, in apply_rotary
    rotary_kernel[grid](
  File "<string>", line 41, in rotary_kernel
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/triton/compiler.py", line 1587, in compile
    so_path = make_stub(name, signature, constants)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/triton/compiler.py", line 1476, in make_stub
    so = _build(name, src_path, tmpdir)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/triton/compiler.py", line 1391, in _build
    ret = subprocess.check_call(cc_cmd)
  File "/home/think/miniconda3/envs/cogvlm2/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/bin/gcc', '/tmp/tmps_oxbp69/main.c', '-O3', '-I/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/triton/third_party/cuda/include', '-I/home/think/miniconda3/envs/cogvlm2/include/python3.10', '-I/tmp/tmps_oxbp69', '-shared', '-fPIC', '-lcuda', '-o', '/tmp/tmps_oxbp69/rotary_kernel.cpython-310-x86_64-linux-gnu.so']' returned non-zero exit status 1.
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留意其中最后几行，triton在编译中（compiler.py）有问题。问题出在编译中使用系统的gcc，链接了系统的cuda库的libcuda.so编译报错，返回值为1（即异常返回），所以triton编译不成功，没能跑下去。

问题的分析

既然是gcc编译，猜测以下方向：

1. gcc版本和cuda版本的对齐问题。

问了一下AI，说cuda11.8最好用gcc7 ～ 10。机器是共用的，也不知道是谁装了个gcc13，于是重新装了一个gcc-9，并用update-alternatives工具管理，将系统的gcc编译器设置为gcc-9。

sudo apt-get update
sudo apt-get install gcc-9 g++-9
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update-alternatives 的命令就不贴，网上很多，而且每个人的环境情况也不同。

2. 链接库的路径不对，或者找不到链接库。

根据compiler.py中查找CUDA路径的源码来一个个对照核实。
compiler.py在triton包中，路径为<your-env-path>/lib/python3.10/site-packages/triton ，留意你的python版本不是3.10，则对应修改。

2.1 设置正确的CUDA路径

compiler.py中_build(name, src, srcdir)函数中，搜索CUDA路径的方法是取环境变量中的CUDA_PATH（下面代码片段），如果找不到，就调用default_cuda_dir()函数查找，我的系统虽然没有这个环境变量，但是cudahome的路径刚好也是default_cuda_dir()中的返回值，为了保险还是添加CUDA_PATH这个环境变量（大部分程序都用CUDA_HOME，triton的作者比较特殊，用了一个CUDA_PATH）。

def _build(name, src, srcdir):
    cuda_lib_dirs = libcuda_dirs()
    cuda_path = os.environ.get('CUDA_PATH', default_cuda_dir())
    cu_include_dir = os.path.join(cuda_path, "include")
    base_dir = os.path.dirname(__file__)
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export CUDA_PATH=<your-cuda-home-path>
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每个人的cuda装的情况不尽相同，我的cudahome路径是/usr/local/cuda，供参考。

2.2 确认链接库存在或者路径正确。

搜索报错信息，subprocess调用的命令叫cc_cmd，搜索一下，在1390行，即以下片段

	cc_cmd = [cc, src, "-O3", f"-I{cu_include_dir}", f"-I{py_include_dir}", f"-I{srcdir}", "-shared", "-fPIC", "-lcuda", "-o", so]
    cc_cmd += [f"-L{dir}" for dir in cuda_lib_dirs]
    ret = subprocess.check_call(cc_cmd)
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其中cuda_lib_dirs这个列表变量是关键，再找，发现在libcuda_dirs()函数中得到，继续找，发现函数很简单，就是调用了linux的whereis命令，然后搜索libcuda.so这个库函数，等效命令就是whereis libcuda.so。

def libcuda_dirs():
    locs = subprocess.check_output(["whereis", "libcuda.so"]).decode().strip().split()[1:]
    return [os.path.dirname(loc) for loc in locs]
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于是在bash中自己验证了一下就发现了问题，通过whereis libcuda.so这个命令是找不到的，所以链接才会失败。于是通过updatedb来更新搜索的索引，发现机器上根本就没有装updatedb。于是赶紧装了一个plocate工具（它是带updatedb的）。

whereis libcuda.so
libcuda.so:
sudo updatedb
sudo: updatedb：找不到命令
sudo apt-get install plocate
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问题的解决

解决的方法其实也很简单，就三步：

1. 增加CUDA_PATH环境变量，并根据你的cuda安装路径设置为正确值。

2. 安装plocate，并运行updatedb将搜索索引更新。

sudo apt-get install plocate 
#完成后再updatedb，刷新搜索索引
sudo updatedb
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3. 修改triton包中compiler.py文件的libcuda_dirs()函数

改一下，把whereis命令改为plocate命令

@functools.lru_cache()
def libcuda_dirs():
    # locs = subprocess.check_output(["whereis", "libcuda.so"]).decode().strip().split()[1:]
    locs = subprocess.check_output(["plocate", "libcuda.so"]).decode().strip().split()[1:]
    return [os.path.dirname(loc) for loc in locs]
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修改后的运行结果

(cogvlm2) think@xsyDL-4090solo:~/CogVLM2-main/basic_demo$ python cli_demo.py 
Special tokens have been added in the vocabulary, make sure the associated word embeddings are fine-tuned or trained.
Unused kwargs: ['_load_in_4bit', '_load_in_8bit', 'quant_method']. These kwargs are not used in <class 'transformers.utils.quantization_config.BitsAndBytesConfig'>.
/home/think/miniconda3/envs/cogvlm2/lib/python3.10/site-packages/transformers/quantizers/auto.py:159: UserWarning: You passed `quantization_config` or equivalent parameters to `from_pretrained` but the model you're loading already has a `quantization_config` attribute. The `quantization_config` from the model will be used.
  warnings.warn(warning_msg)

image path >>>>> demo.jpg

Human:What's in it?

CogVLM2: The image captures a serene and lush landscape. At the center, there is a wooden boardwalk that cuts through a vibrant green meadow. The boardwalk appears weathered and has a rustic charm, inviting one to walk through and explore the surroundings. The meadow is lush with tall grasses that sway gently in the breeze, suggesting a sense of peace and tranquility. The background is a clear blue sky with some wispy clouds, indicating a sunny day. There are no visible animals or people, which adds to the stillness of the scene. The landscape is likely a nature preserve or a park, designed to offer visitors a tranquil walk through a natural setting.

Human:Can you answer in Chinese?

CogVLM2: 图片中有一条木制栈道，位于一片绿色的草地中央。栈道看起来有些老旧，但依然坚固，引导人们走进这片美丽的自然景观。草地上长满了茂盛的植物，它们在微风中轻轻摇曳，营造出一种宁静和谐的氛围。天空是晴朗的蓝色，上面飘着几朵白云，为这片景色增添了几分生动。这里没有明显的动物或人类活动，进一步增强了这份宁静。很可能，这是一个自然保护区或公园，旨在为游客提供一个漫步自然、亲近自然的场所。
Human:    
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