On Nov 9 00:56, Linda Walsh wrote:
> I was running some network bandwidth tests using "dd" (WinXP2/Cygwin)
>
> I was timing copies of a 300MB file from local disk to a remote
> server. The local computer has enough memory to hold the file
> in the memory cache once it is loaded.
>
> I ran through increasing power-of-two block sizes from
> 512 bytes up to 512MB, where it, theoretically could read
> and write the file in one read and write for the whole file.
> Essentially (say "s:" is a network drive):
>
> for (i = 512; i<=512MB; i = i*2) do {
> dd bs=$i if=/tmp/input of=/s/Video/output.dat
> }
>
> Unfortunately, the test /fails/ at or above 64MB (actually at or
> above 65,005KB). The ERROR message is:
>
> dd: writing '/s/Video/output.dat': Resource temporarily unavailable
I tried this with a 120 Megs and 1.2 Gigs file and dd works with all
blocksize up to the tested 512 Megs for me.
Could this be a network issue with big blocksizes, maybe?
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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