STINNER Victor added the comment: bench_scandir.py: dummy benchmark to compare listdir+stat vs scandir+is_dir.
os.scandir() is always slower than os.listdir() on tmpfs and ext4 partitions of a local hard driver. I will try with NFS. Results with scandir-5.patch on Fedora 21 (Linux). --- Using /home/haypo (ext4, hard drive) --- Test listdir+stat vs scandir+is_dir Temporary directory: /home/haypo/tmpji8uviyl Create 100000 files+symlinks... Create 10000 directories... # entries: 210000 Benchmark... listdir: 2187.3 ms scandir: 1047.2 ms listdir: 494.4 ms scandir: 1048.1 ms listdir: 493.0 ms scandir: 1042.6 ms Result: listdir: min=493.0 ms (2.3 us per file), max=2187.3 ms (10.4 us per file) scandir: min=1042.6 ms (5.0 us per file), max=1048.1 ms (5.0 us per file) scandir is between 0.5x and 2.1x faster --- Using /tmp (tmpfs, full in memory) --- Test listdir+stat vs scandir+is_dir Temporary directory: /tmp/tmp6_zk3mqo Create 100000 files+symlinks... Create 10000 directories... # entries: 210000 Benchmark... listdir: 405.4 ms scandir: 1001.3 ms listdir: 403.3 ms scandir: 1024.2 ms listdir: 408.1 ms scandir: 1013.5 ms Remove the temporary directory... Result: listdir: min=403.3 ms (1.9 us per file), max=408.1 ms (1.9 us per file) scandir: min=1001.3 ms (4.8 us per file), max=1024.2 ms (4.9 us per file) scandir is between 0.4x and 0.4x faster ---------- Added file: http://bugs.python.org/file38114/bench_scandir.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22524> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
