creating size-limited tar files
andrea crotti
andrea.crotti.0 at gmail.com
Wed Nov 14 10:56:28 EST 2012
Ok this is all very nice, but:
[andrea at andreacrotti tar_baller]$ time python2 test_pipe.py > /dev/null
real 0m21.215s
user 0m0.750s
sys 0m1.703s
[andrea at andreacrotti tar_baller]$ time ls -lR /home/andrea | cat > /dev/null
real 0m0.986s
user 0m0.413s
sys 0m0.600s
where test_pipe.py is:
from subprocess import PIPE, Popen
# check if doing the pipe with subprocess and with the | is the same or not
pipe_file = open('pipefile', 'w')
p1 = Popen('ls -lR /home/andrea', shell=True, stdout=PIPE, stderr=PIPE)
p2 = Popen('cat', shell=True, stdin=p1.stdout, stdout=PIPE, stderr=PIPE)
p1.stdout.close()
print(p2.stdout.read())
So apparently it's way slower than using this system, is this normal?
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