理解dynamic performance analysis

动态程序分析关注于在实际执行过程中对软件的分析,例如单元测试、集成测试等。相反,静态分析则在不执行程序的情况下进行,用于检查代码质量。两者在软件开发的测试和验证阶段都发挥着重要作用。
  • Overview

    Consider printing some statictics (fancy term: dynamic performance analysis) while your program is running, or after it finishes.

  • Dynamic program analysis

    Dynamic program analysis is the analysis of computer software that is performed by executing programs on a real or vitual processor.

    Dynamic analysis is in contrast to static program analysis.

    Unit tests, integration tests, system tests and accptance tests use dynamic testing.

  • Static program analysis

    Static program analysis is performed without actually executing programs, in contrast with dynamic analysis.

  • References

  1. Static Program Analysis
When an analysis requires a large number of increments (over 20), the following considerations and approaches can be taken: ### Computational Resources - Ensure that the computing device has sufficient memory and processing power. For complex numerical analyses, a multi - core CPU or a GPU - accelerated system can significantly speed up the process. For example, in finite element analysis, using a high - performance workstation or a cluster of servers can handle a large number of incremental steps more efficiently. - Optimize the code if the analysis is being carried out through programming. Use efficient algorithms and data structures. For instance, in Python, using NumPy arrays instead of native Python lists can lead to faster computations. ```python import numpy as np # Example of using NumPy for numerical operations arr = np.array([1, 2, 3, 4, 5]) result = arr * 2 print(result) ``` ### Convergence and Stability - Check the convergence criteria of the analysis method. A large number of increments may be due to slow convergence. Adjust the tolerance values for convergence checks. For example, in an iterative solver for a system of linear equations, reducing the relative error tolerance can improve the accuracy but may increase the number of iterations. - Implement stability checks during the incremental process. Some analyses, like dynamic simulations, may become unstable over a large number of steps. Use appropriate numerical damping techniques to maintain stability. ### Data Management - Store intermediate results properly. Since there will be a large number of increments, saving the data at each step can be useful for post - processing and debugging. Consider using file formats that are optimized for large - scale data storage, such as HDF5. ```python import h5py # Example of saving data to HDF5 file data = np.random.rand(100) with h5py.File('data.h5', 'w') as f: f.create_dataset('my_data', data = data) ``` - Plan for data visualization. With a large number of increments, visualizing the results can help in understanding the trends and patterns. Use software like MATLAB, Python's Matplotlib, or specialized visualization tools depending on the nature of the analysis.
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