os.environ["veclib_maximum_threads"] = "1"
时间: 2023-11-03 18:33:36 浏览: 48
这行代码是设置环境变量`veclib_maximum_threads`的值为1,它通常用于控制numpy的并行计算线程数。在多核CPU上,numpy会默认使用所有可用的线程来加速计算,但有时候这会导致程序的性能下降或者出现其他问题。通过将`veclib_maximum_threads`设置为1,可以强制numpy只使用一个线程来进行计算,从而避免这些问题。
相关问题
os.environ LOCAL_RANK
os.environ['LOCAL_RANK']是一个环境变量,用于存储当前进程在本机上的rank。在使用PyTorch进行分布式训练时,可以通过设置`--use_env`参数来将当前进程的rank添加到环境变量中的LOCAL_RANK中,而不是添加到args.local_rank中。这样可以方便地在代码中获取当前进程的rank信息。[3]
os.environ["OPENBLAS_NUM_THREADS"] = "1"
This line of code sets the environment variable OPENBLAS_NUM_THREADS to the value of 1.
OPENBLAS_NUM_THREADS is a variable used by the OpenBLAS library, which is an open-source implementation of the Basic Linear Algebra Subprograms (BLAS) and the Linear Algebra Package (LAPACK) libraries. These libraries provide optimized routines for performing common linear algebra operations, such as matrix multiplication and matrix inversion.
Setting OPENBLAS_NUM_THREADS to 1 specifies that the library should use only one thread for parallel execution. This can be useful in situations where the overhead of thread creation and synchronization outweighs the benefits of parallel execution, or when running on a system with limited resources.