Hi, I'm seeing a very slow extraction of an uncompressed tar file using
'tarfile' in Python 3.5.3 vs. the native Debian tar tool. This is a
console log from my machine:
jimm@scw-000001:~$ time tar xf update.tar
real 0m3.436s
user 0m0.430s
sys 0m2.870s
jimm@scw-000001:~$ rm -rf home
jimm@scw-000001:~$ cat untar-test.py
#!/usr/bin/env python3
import tarfile
tar = tarfile.open('update.tar')
tar.extractall()
jimm@scw-000001:~$ time ./untar-test.py
real 0m12.216s
user 0m8.730s
sys 0m3.030s
jimm@scw-000001:~$ uname -a
Linux scw-000001 4.3.5-std-1 #1 SMP Fri Feb 19 11:52:18 UTC 2016 armv7l
GNU/Linux
jimm@scw-000001:~$ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04)
[GCC 6.3.0 20170118] on linux
Type "help", "copyright", "credits" or "license" for more information.
----
I also tried this with 3.7.0b3 and I get the same result. On my desktop,
an x86_64 running Ubuntu, there's little difference between tarfile and
native tar. Obviously there will be some time spent starting Python but
the above seems too much. Does anyone have any ideas what might cause
this or where to look next? Does x86_64 do more of this in C code that's
interpreted on armv7l, for example?
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