Transfer Rate Disk Post: 302504499

Sponsored Content

Top Forums UNIX for Dummies Questions & Answers Transfer Rate Disk Post 302504499 by Corona688 on Monday 14th of March 2011 06:45:34 PM

03-14-2011

Registered User

Since this is Linux, if you send a SIGUSR1 to dd while it's in operation, it will print statistics to standard error.

Code:

# useless:  read /dev/zero, write /dev/null, in blocks of one megabyte
$ dd if=/dev/zero of=/dev/null bs=1048576 &
[1] 25076
$ killall -USR1 dd
4115+1 records in
4115+0 records out
4314890240 bytes (4.3 GB) copied, 2.38339 s, 1.8 GB/s
$ killall dd
[1]+  Terminated              dd if=/dev/zero of=/dev/null bs=1048576
$

It will also print a summary to standard error when it completes.

You may want to add "oflag=sync" to prevent cache effects from messing up your numbers.

These 2 Users Gave Thanks to Corona688 For This Post:

Corona688

View Public Profile for Corona688

Visit Corona688's homepage!

Find all posts by Corona688

3 More Discussions You Might Find Interesting

1. HP-UX

HP UX disk io rate question

I only have two disk in my HP machine but when i execute iostat command device bps sps msps c0t0d1 0 0.0 1.0 disk0 49 2.8 1.0 disk5 0 0.0 1.0 I didn't know where device name disk0 and disk5 device name disk0 disk5 ,it is really disk or...

2. UNIX for Dummies Questions & Answers

Very SLOW STFTP transfer rate

Hi, I am experiencing extremely show transfer rates when transferring zip files over SFTP. Over FTP it works fine. I have disabled compression in the sshd_config file but that does not seem to help.. Any ideas?

3. UNIX for Advanced & Expert Users

Limit transfer speed rate by iptables Rules

I have D-Link Router DSL-2730U that support busybox OS and iptables version 1.4.0 I managed successfully to block the host for being connect to the internet using the following command block by ip address iptables -I FORWARD -d 192.168.1.6 -j DROP Or By mac source iptables -I...

LEARN ABOUT MINIX

mem

MEM(4)                                                       Linux Programmer's Manual                                                      MEM(4)

NAME

       mem, kmem, port - system memory, kernel memory and system ports

DESCRIPTION

       /dev/mem is a character device file that is an image of the main memory of the computer.  It may be used, for example, to examine (and even
       patch) the system.

       Byte addresses in /dev/mem are interpreted as physical memory addresses.  References to nonexistent locations cause errors to be returned.

       Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present.

       Since Linux 2.6.26, and depending on the architecture, the CONFIG_STRICT_DEVMEM kernel configuration option limits the areas which  can  be
       accessed through this file.  For example: on x86, RAM access is not allowed but accessing memory-mapped PCI regions is.

       It is typically created by:

           mknod -m 660 /dev/mem c 1 1
           chown root:kmem /dev/mem

       The  file  /dev/kmem  is  the same as /dev/mem, except that the kernel virtual memory rather than physical memory is accessed.  Since Linux
       2.6.26, this file is available only if the CONFIG_DEVKMEM kernel configuration option is enabled.

       It is typically created by:

           mknod -m 640 /dev/kmem c 1 2
           chown root:kmem /dev/kmem

       /dev/port is similar to /dev/mem, but the I/O ports are accessed.

       It is typically created by:

           mknod -m 660 /dev/port c 1 4
           chown root:kmem /dev/port

FILES

       /dev/mem
       /dev/kmem
       /dev/port

SEE ALSO

       chown(1), mknod(1), ioperm(2)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux                                                               2015-01-02                                                              MEM(4)