I'm rewriting 3 programs as one program - from Python with Tkinter to
Python with pygtk, both on Windows XP.
My new version formats an SD card and preallocates some file space in
about 3 minutes with "Optimize Performance" selected, and in about 30
minutes with "Optimize for Quick Removal" selected. Needless to say, I
don't like the 27 minute penalty much.
But the old version of the program formats and preallocates in 3 minutes
irrespective of whether the drive is in "optimize performance" or
"optimize for quick removal".
I'm baffled. I've gone over the old code, and found nothing relevant
looking, and I've never seen anything this puzzling in my years of work
on *ix.
Can someone please elucidate?
(I've also written a pair of minimal programs in Python and C that
exhibit the same behavior on this XP system - so it's not just my GUI app)
Thanks!
PS: Here's the minimal python test program I mentioned. It's dog slow
unless I Optimize for Performance the drive.:
#!/cygdrive/c/Python26/python
import os
import time
one_meg = 'a'*2**20
t0 = time.time()
i = 0
file = open('remove-me', 'w')
while True:
i += 1
file.write(one_meg)
t1 = time.time()
bits_written = i*2**20*8
duration = t1-t0
print i, str(duration)+'s', bits_written/(duration*1024*1024),
'Mbps'
if duration > 120:
break
file.close()
os.unlink('remove-me')
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