[Numpy-discussion] tofile speed

Sebastian Haase haase@msg.ucsf....
Tue Jul 24 03:17:51 CDT 2007


Your are not generating text files - right?

On 7/24/07, Sebastian Haase <haase@msg.ucsf.edu> wrote:
> So you are  saying that a given tofile() call returns only after 2 seconds !?
> Can you measure the getData() call time  (just comment the tofile out
> for a while- I that doesn't use 100% CPU ..) ? (timeit module is
> needed - I think)
> Maybe multithreading might help - so that tofile() and GetData() can overlap.
> But 2 sec is really slow ....
>
> -S.
>
>
> On 7/24/07, Lars Friedrich <lfriedri@imtek.de> wrote:
> > Hello everyone,
> >
> > thank you for the replies.
> >
> > Sebastian, the chunk size is roughly 4*10^6 samples, with two byte per
> > sample, this is about 8MB. I can vary this size, but increasing it only
> > helps for much smaller values. For example, when I use a size of 100
> > Samples, I am much too slow. It gets better for 1000 Samples, 10000
> > Samples and so on. But since I already reached a chunksize in the region
> > of megabytes, I have difficulties to increase my buffer size further. I
> > also have the feeling that increasing does not help in this size region.
> > (correct me if I am wrong...)
> >
> > Chuck, I am using a Windows XP system with a new (few months old) Maxtor
> > SATA-drive.
> >
> > Lars
> > _______________________________________________
> > Numpy-discussion mailing list
> > Numpy-discussion@scipy.org
> > http://projects.scipy.org/mailman/listinfo/numpy-discussion
> >
>


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