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I tested yes using pv with following command on two different distros :

yes | pv > /dev/null

Results :

Ubuntu 16.04 : 5.83GiB/s

Centos 7.x : 100MiB/s

Here is my Specs:

1st distro : Ubuntu Ubuntu 16.04.6 LTS - VM(VMware Workstation) - 4GB ram - 4 CPU- kernel : 4.4.0-166-generic.x86_64

2nd distro : Centos 7.7.1908 (Core) - VM(Vmware Workstation) - 4GB ram - 4 CPU- kernel : 3.10.0-1062.4.1.el7.x86_64

Vmware workstation 15.5 installed on Windows 10

I was wondering what is the cause of such difference between these two to write on the ram.

Why is Centos too slow to write on the ram?

or is Ubuntu making mistake on performance monitoring while writing on the ram?

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  • Can you share complete details how you tested with command and summary output.
    – asktyagi
    Nov 3, 2019 at 6:26
  • Is this about maintaining IT systems in a business environment?
    – Marco
    Nov 3, 2019 at 6:49
  • @asktyagi yes | pv > /dev/null
    – Vahid Hashemi
    Nov 3, 2019 at 12:44
  • @Marco no this is more like performance tuning of underpinning systems
    – Vahid Hashemi
    Nov 3, 2019 at 12:45
  • 1
    Found the problem, unfortunately the topic is locked. Perhaps somebody call @womble to unlock the topic. The problem was the version of "yes" shipped with Centos 7.7 which was 8.21 seems pretty outdated, for Ubuntu "yes" version was 8.25. After compiling "yes" version 8.25 for Centos the issues solved.
    – Vahid Hashemi
    Nov 4, 2019 at 7:20

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