scripts/simplebench/bench_write_req.py

3 # Test to compare performance of write requests for two qemu-img binary files.
5 # The idea of the test comes from intention to check the benefit of c8bb23cbdbe
40     '''Run qemu-img and return its output'''
47         sys.stderr.write('qemu-img received signal %i: %s\n'
48                          % (-exitcode, ' '.join(list(args))))
56     The function creates a QCOW2 image with the given path/name. Then it runs
57     the 'qemu-img bench' command and makes series of write requests on the
61     qemu_img     -- path to qemu_img executable file
62     image_name   -- QCOW2 image name to create
63     block_size   -- size of a block to write to clusters
64     block_offset -- offset of the block in clusters
65     cluster_size -- size of the image cluster
71     if not os.path.isfile(qemu_img):
75     image_dir = os.path.dirname(os.path.abspath(image_name))
76     if not os.path.isdir(image_dir):
77         print(f'Path not found: {image_name}')
82     args_create = [qemu_img, 'create', '-f', 'qcow2', '-o',
86     count = int(image_size / cluster_size) - 1
89     args_bench = [qemu_img, 'bench', '-w', '-n', '-t', 'none', '-c',
90                   str(count), '-s', f'{block_size}', '-o', str(block_offset),
91                   '-S', step, '-f', 'qcow2', image_name]
110         return {'seconds': float(ret_list[index-1])}
118         program = os.path.basename(sys.argv[0])
119         print(f'USAGE: {program} <path to qemu-img binary file> '
120               '<path to another qemu-img to compare performance with> '
124     # Test-cases are "rows" in benchmark resulting table, 'id' is a caption
153     # Test-envs are "columns" in benchmark resulting table, 'id is a caption
158             'id': '<qemu-img binary 1>',
163             'id': '<qemu-img binary 2>',