On 7/25/07, Lars Friedrich <lfriedri@imtek.de> 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