From: bolega <gnuist006@gmail.com>
To: help-gnu-emacs@gnu.org
Cc: gnuist006@gmail.com
Subject: dd - unequal speed from partition to partition, partition to file, file to partition
Date: Mon, 28 Mar 2011 12:28:03 -0700 (PDT) [thread overview]
Message-ID: <25819901-c857-405d-8ef6-ee0ac2ee1ea0@18g2000prd.googlegroups.com> (raw)
dd - unequal speed from partition to partition, partition to file,
file to partition
/dev/sda1 to /dev/sda2 around 25Meg/s
/dev/sda1 to a file_sda1 around 12Meg/s
file_sda1 to /dev/sda1 around 5Meg/s
Why ???
I have played with various block sizes such 1M, 4M, 500M
In the all three cases, its from the same disk to itself OR from
different disks, eg SATA to USB ... if I recall correctly.
Please give an explanation why read from a file to disk partition is
so slow ???
Bolega
next reply other threads:[~2011-03-28 19:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 19:28 bolega [this message]
2011-03-28 19:37 ` dd - unequal speed from partition to partition, partition to file, file to partition Stan Bischof
2011-03-28 22:29 ` Stefan Monnier
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