Processor / memory bandwidthd? in GB/s

dd if=/dev/zero of=/dev/null bs=1M count=32768
Read 32GB zero's and throw them away. How fast is your system?
Sample Output
32768+0 records in
32768+0 records out
34359738368 bytes (34 GB) copied, 2.56305 s, 13.4 GB/s

45
2009-02-16 12:22:18
dd

These Might Interest You

What Others Think

Quad Core + 6G ram, 34359738368 bytes (34 GB) copied, 3.09455 s, 11.1 GB/s What you running?
Williebee · 487 weeks ago
BTW Nice command!
Williebee · 487 weeks ago
Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz on the same hardware, a different OS... @CentOS 5.2 x86_64 ... 37.0GB/s @openSUSE 11 x86_64 ... 13.4GB/s The OS, Processor and memory-speed have influence on this value... What is your fastest system???
jacquesloonen · 487 weeks ago
Very nice command! On Ubuntu with macbook 4,1 (Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz) I get up to 10.6GB/s with some crap running... I'll try it later on a LFS with nothing at all. BTW, you get a different answer each time, so run it several times to get an idea.
gniourf_gniourf · 487 weeks ago
32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 25.1875 s, 1.4 GB/s This is an Acer Aspire One Netbook running Ubuntu jaunty alpha6 processor: Intel(R) Atom(TM) CPU N270 @ 1.60GHz
dudus · 483 weeks and 3 days ago
mobile@Bills-iPhone ~ $ time dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 285.487 s, 120 MB/s real 4m45.681s user 0m0.340s sys 4m8.030s Had to try this on my iPhone :)
my0pic · 473 weeks and 4 days ago
PowerEdge R900, 67 GB/sec
infinity005 · 473 weeks and 1 day ago
# time dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 enregistrements lus 32768+0 enregistrements ?crits 34359738368 octets (34 GB) copi?s, 18,536 s, 1,9 GB/s real 0m18.540s user 0m0.016s sys 0m18.405s model name : AMD Athlon(tm) 5000 Dual-Core Processor Linux version 2.6.32-3-amd64 (Debian 2.6.32-9)
crashdump · 421 weeks ago
32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 24.6279 s, 1.4 GB/s On an 8 year old Dell Dimension 8250 (desktop), with Intel Pentium 4 Processor 2.53GHz, 533MHz system bus, Dual Channel PC1066 RDRAM, and 512MB Rambus RDRAM.
quintic · 407 weeks and 3 days ago
dd if=/dev/zero of=/dev/null bs=1048576 count=32768 32768+0 records in 32768+0 records out 34359738368 bytes transferred in 24.666 secs (1393000014 bytes/sec) That's 1.3GB/s on a Droid X running Froyo. Niiice! ;]
HerbCSO · 395 weeks and 3 days ago
The following was run on a Rackspace Cloud 256MB Server Instance dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 6.26173 s, 5.5 GB/s
Nichlas · 364 weeks and 2 days ago
# AMD Phenom II X4 955BE, 4Gb ddr3 1333 # mixed Sabayon-Gentoo, 64bits dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 4.17995 s, 8.2 GB/s
ivanalejandro0 · 349 weeks and 5 days ago
[edvin@vampire ~]$ dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 0.614522 seconds, 55.9 GB/s [edvin@vampire ~]$ cat /proc/meminfo MemTotal: 3788648 kB ... [edvin@vampire ~]$ cat /proc/cpuinfo ... model name : AMD Athlon(tm) II X2 250 Processor ... cache size : 1024 KB
cyberpunk · 307 weeks and 3 days ago
Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz OC'd to 3.1 GHz with RAM running at aprox DDR2-1066 4 year old setup still beating some of the recent CPUs :D dd if=/dev/zero of=/dev/null bs=1M count=32768 32768+0 records in 32768+0 records out 34359738368 bytes (34 GB) copied, 2.21756 s, 15.5 GB/s
tox2ik · 295 weeks and 3 days ago
1,51185 s, 22,7 GB/s Intel(R) Core(TM) i5-3550 CPU @ 3.30GHz 17,9058 s, 1,9 GB/s Intel(R) Atom(TM) CPU D410 22.131 sec 1,4 (around) GB/s Xiaomi Redmi Note Prime (Snap410)
Soul_in_Gun · 123 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: