Messages in this thread | | | Date | Sat, 13 Jan 2001 00:08:06 -0500 (EST) | From | John Heffner <> | Subject | Re: BUG in 2.4.0: dd if=/dev/random of=out.txt bs=10000 count=100 |
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> dd says it completes happily even when copying from > random. 0+100 records in, 0+100 records out. It
This means that dd completed 100 reads, and none of them were of the requested length (10000 bytes).
> takes about thirty seconds to finish on the dual > gigahertz processor intel box I'm using to test it, > which implies it's actually performing the truly > impressive waste of CPU cycles I'm requesting from it. > I'm just not getting the data in my file.
/dev/random generates (hopefully) truly random values, and relies on receiving interrupts. It doesn't spend very many CPU cycles. For most purposes, /dev/urandom is adequate, and will be much faster for such large quantities of data.
-John
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