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I wonder , what will happen
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I wonder , what will happen

tarek.boxtarek.box Member
edited September 2015 in Help

I wonder ,

what will happen if i put this code

dd if=/dev/zero of=/dev/null bs=10G count=1 oflag=direct

in shell script pool if OPENVZ or KVM any one knows ?

Comments

  • You will send spam to 100k random email addresses.

    Thanked by 1yomero
  • I call 911 with that code, works every time.

  • linuxthefishlinuxthefish Member
    edited September 2015

    You can't use oflag=direct with /dev/null

    Without it seems to work fine, here is for OpenVZ

    [root@s /]# dd if=/dev/zero of=/dev/null bs=10G count=1
    0+1 records in
    0+1 records out
    2147479552 bytes (2.1 GB) copied, 0.616502 s, 3.5 GB/s
    [root@s /]# dd if=/dev/zero of=/dev/null bs=1G count=10
    10+0 records in
    10+0 records out
    10737418240 bytes (11 GB) copied, 1.37971 s, 7.8 GB/s

  • perennateperennate Member, Host Rep

    Wow, what provider are you using?? That disk I/O is so high!

    Thanked by 3linuxthefish yomero jar
  • @linuxthefish

    from where you buy your server ?

  • @tarek4web said:
    linuxthefish

    from where you buy your server ?

    It's not the real disk I/O, I think this uses CPU more than anything!

    Thanked by 2tarek.box ucxo
  • @linuxthefish

    I have a curiosity to know from where you bought it ?

  • NomadNomad Member
    edited September 2015

    @linuxthefish said:
    It's not the real disk I/O, I think this uses CPU more than anything!

    [11:31] root@loki: /home/nomad # dd if=/dev/zero of=/dev/null bs=10G count=1
    0+1 records in
    0+1 records out
    2147479552 bytes (2.1 GB) copied, 0.54953 s, 3.9 GB/s
    [11:42] root@loki: /home/nomad # dd if=/dev/zero of=/dev/null bs=1G count=10
    10+0 records in
    10+0 records out
    10737418240 bytes (11 GB) copied, 1.37481 s, 7.8 GB/s
    

    Not much of a difference with a 1220v2

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