[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] File sink causes "S" errors

From: Seth David Schoen
Subject: Re: [Discuss-gnuradio] File sink causes "S" errors
Date: Tue, 5 Oct 2010 22:18:21 -0700
User-agent: Mutt/1.5.20 (2009-06-14)

Nick Foster writes:

> > > dd if=/dev/zero of=/SSD/test.bin bs=1000K count=1000
> > 1000+0 records in
> > 1000+0 records out
> > 1024000000 bytes (1.0 GB) copied, 9.76347 s, 105 MB/s
> > 
> Try /dev/random instead of /dev/zero. SSDs are known to use data
> compression algorithms to run-length-encode drive data on the fly, to
> increase bandwidth and reduce data replication on the drive. It's
> possible that your drive is performing write optimization on your test
> which is not applicable to the real world.

If you want a speed benchmark you probably want /dev/urandom instad
of /dev/random, because /dev/random will block when it runs out
of high-quality random numbers.

Seth David Schoen <address@hidden> | Qué empresa fácil no pensar en
     http://www.loyalty.org/~schoen/   | un tigre, reflexioné.
     http://vitanuova.loyalty.org/     |            -- Borges, El Zahir

reply via email to

[Prev in Thread] Current Thread [Next in Thread]