On 7/25/07, Lars Friedrich <[EMAIL PROTECTED]> wrote:
Hello,
I tried the following:
####### start code
a = N.random.rand(1000000)
myFile = file('test.bin', 'wb')
for i in range(100):
a.tofile(myFile)
myFile.close()
####### end code
And this gives roughly 50 MB/s on my office-machine but only 6.5 MB/s on
the machine that I was reporting about.
Both computers use Python 2.4.3 with enthought 1.0.0 and numpy 1.0.1
So I think I will go and check the harddisk-drivers. array.tofile does
not seem to be the problem and actually seems to be very fast. Any other
recommendations?
You might check what disk controllers the disks are using. I got an almost
x10 speedup moving some disks from a DELL PCI CERC board to the onboard SATA
and using software raid. Sometimes DMA isn't enabled, but that is pretty
rare these days.
Chuck
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