python disk i/o speed
nnes
pruebauno at latinmail.com
Mon Aug 12 06:05:49 EDT 2002
"Karl Vogel" <vogelke at dnaco.net> wrote in message news:<mailman.1028926755.31828.python-list at python.org>...
> Benchmarks on Pentium-200 FreeBSD, /tmp is RAM disk:
>
> me% df /tmp
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> mfs:34 257998 19234 218126 8% /tmp
>
> me% time ./bench.py in out
> ./bench.py in out 145.90s user 0.72s system 99% cpu 2:27.97 total
>
> me% time ./bench2.py in out
> ./bench2.py in out 143.74s user 0.73s system 97% cpu 2:28.66 total
>
> me% time ./bench3.py in out
> ./bench3.py in out 130.80s user 0.54s system 99% cpu 2:12.13 total
>
> me% time ./bench.pl in out
> ./bench.pl in out 98.31s user 0.70s system 99% cpu 1:39.81 total
>
> me% time ./bench.c in out
> ./bench in out 6.48s user 0.55s system 96% cpu 7.259 total
>
I don´t know where our discrepancy generates. Could be the Python
version 2.1.3 vs 2.2.1 or the Windows vs BSD implementation???
###################bench10.py
import sys,xreadlines,profile,pstats
def filterfile2(inname, outname):
input = file(inname)
output = file(outname, 'w')
localint = int
l_outwrite = output.write
for line in input.xreadlines():
line12 = line[1:-2]
x, y, z = line12.split('","')
l_outwrite('"'+line12+'","'+str(localint(x)+localint(y)+localint(z))+'"\n')
output.close()
input.close()
if len(sys.argv)<3:
sys.exit("bench input output")
#filterfile2(sys.argv[1],sys.argv[2])
profile.run('filterfile2(sys.argv[1],sys.argv[2])','filtprof')
p = pstats.Stats('filtprof')
p.sort_stats('time').print_stats()
######################bench9.py
import sys,xreadlines,profile,pstats
def filterfile2(inname, outname):
input = file(inname)
output = file(outname, 'w')
localint = int
l_outwrite = output.write
for line in input.xreadlines():
line12 = line[1:-2]
x, y, z = line12.split('","')
l_outwrite('"%s","%s"\n' % (
line12,localint(x) + localint(y) + localint(z)))
output.close()
input.close()
if len(sys.argv)<3:
sys.exit("bench input output")
#filterfile2(sys.argv[1],sys.argv[2])
profile.run('filterfile2(sys.argv[1],sys.argv[2])','filtprof')
p = pstats.Stats('filtprof')
p.sort_stats('time').print_stats()
######################result
C:\Python22\src>..\python -O bench10.py iii ooo
Mon Aug 12 10:50:10 2002 filtprof
3 function calls in 73.202 CPU seconds
Ordered by: internal time
ncalls tottime percall cumtime percall
filename:lineno(function)
1 73.199 73.199 73.199 73.199
bench10.py:3(filterfile2)
1 0.003 0.003 73.202 73.202
profile:0(filterfile2(sys.argv[1],
sys.argv[2]))
1 0.000 0.000 73.200 73.200 <string>:1(?)
0 0.000 0.000 profile:0(profiler)
C:\Python22\src>..\python -O bench9.py iii ooo
Mon Aug 12 10:51:43 2002 filtprof
3 function calls in 79.530 CPU seconds
Ordered by: internal time
ncalls tottime percall cumtime percall
filename:lineno(function)
1 79.527 79.527 79.527 79.527 bench9.py:3(filterfile2)
1 0.003 0.003 79.530 79.530
profile:0(filterfile2(sys.argv[1],
sys.argv[2]))
1 0.000 0.000 79.528 79.528 <string>:1(?)
0 0.000 0.000 profile:0(profiler)
Nestor
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