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Have you broke DD yet? 4+GB/s :)
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Have you broke DD yet? 4+GB/s :)

TACServersTACServers Member
edited July 2014 in General

Here is some of the latest, umm, performance of a new node. Since DD seems to be popular around these parts,

Can we all agree that this DD is just amazing!! Look at these numbers!! They are Awesome!
/sarcasm

[root@omg] /# dd if=/dev/random of=file bs=64k count=64k conv=fdatasync
65536+0 records in
65536+0 records out
4294967296 bytes transferred in 1.004636 secs (4275148516 bytes/sec) [4.27GB/s]

[root@omg] /# dd of=/dev/null if=file bs=64k count=64k conv=fdatasync
65536+0 records in
65536+0 records out
4294967296 bytes transferred in 1.000640 secs (4292220638 bytes/sec) [4.29GB/s]

Thanked by 1lukesUbuntu

Comments

  • drserverdrserver Member, Host Rep
    edited July 2014

    What CPU is on that node ? E9 ?

  • linuxthefishlinuxthefish Member
    edited July 2014

    dd bs=4M if=/dev/zero of=/dev/sda

  • PwnerPwner Member

    @drserver said:
    What CPU is on that node ? E9 ?

    Intel Pentium 4, 2.4 GHz.

  • linuxthefish said: dd bs=4M if=/dev/zero of=/dev/sda

    Oh, man, you are a dick.

  • @drserver, not E9 :) The key is keeping /dev/random filled, try creating garbage, random IO on another disk when running the test, keeps the entropy full. I only use /dev/random, because /dev/zero is sooooo compressible.
    Quote:
    "In Linux /dev/random is a special file which serves high quality pseudo random numbers. This implementation collects entropy from events originating from the keyboard, mouse, disk and system interrupts.(refer this document) So when there are no such events, the entropy pool is empty, reads from /dev/random will block until additional environmental noise is gathered. This explains your problem. To fill the entropy pool you can press keys on keyboard."

    @linuxthefish, I said break DD, not the whole node :)

    @Pwner, I can't recall the P4 of that era having more than AGP and PCI busses. Should be close to impossible to hit 1GB writes.

    @Rallias, Agreed :)

    Thanked by 2lukesUbuntu drserver
  • drserverdrserver Member, Host Rep

    E 10 ?

  • TACServersTACServers Member
    edited July 2014

    @drserver said:
    E 10 ?

    E7v2 is the latest out, no? 60 cores, 120 Threads per quad socket server, 1 to 1.5TB RAM per socket.

    PowerEdge R920's are nice :)

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