[Bug 1468202] [NEW] mtr has high CPU use when paused

[clickwir]

Public bug reported:

While running mtr, hitting 'P' to pause, causes CPU use to ramp up.
Pressing 'space' to unpause, resumes normal function and CPU use. This
consumes one (1) core at 100%.

While running mtr, hitting 'H' to get the help menu also pauses the
current traceroute/ping process while displaying a Help menu. However,
this pause does not cause excess CPU use and normal function and CPU use
are resumed when leaving the Help screen.

sudo apt-cache policy mtr-tiny
mtr-tiny:
  Installed: 0.85-3
  Candidate: 0.85-3
  Version table:
 *** 0.85-3 0
        500 http://mirrors.advancedhosters.com/ubuntu/ vivid/main amd64 Packages
        500 http://mirror.symnds.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

uname -a
Linux mach 3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Kubuntu 15.04 64bit

** Affects: mtr (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cpu mtr

** Description changed:

  While running mtr, hitting 'P' to pause, causes CPU use to ramp up.
  Pressing 'space' to unpause, resumes normal function and CPU use. This
  consumes one (1) core at 100%.
  
  While running mtr, hitting 'H' to get the help menu also pauses the
  current traceroute/ping process while displaying a Help menu. However,
  this pause does not cause excess CPU use and normal function and CPU use
  are resumed when leaving the Help screen.
  
- sudo apt-cache policy mtr
- mtr:
-   Installed: (none)
+ sudo apt-cache policy mtr-tiny
+ mtr-tiny:
+   Installed: 0.85-3
    Candidate: 0.85-3
    Version table:
-      0.85-3 0
-         500 http://mirrors.advancedhosters.com/ubuntu/ vivid/universe amd64 Packages
-         500 http://mirror.symnds.com/ubuntu/ vivid/universe amd64 Packages
+  *** 0.85-3 0
+         500 http://mirrors.advancedhosters.com/ubuntu/ vivid/main amd64 Packages
+         500 http://mirror.symnds.com/ubuntu/ vivid/main amd64 Packages
+         100 /var/lib/dpkg/status
  
  uname -a
  Linux mach 3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
  
  Kubuntu 15.04 64bit

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https://bugs.launchpad.net/bugs/1468202

Title:
  mtr has high CPU use when paused

Status in mtr package in Ubuntu:
  New

Bug description:
  While running mtr, hitting 'P' to pause, causes CPU use to ramp up.
  Pressing 'space' to unpause, resumes normal function and CPU use. This
  consumes one (1) core at 100%.

  While running mtr, hitting 'H' to get the help menu also pauses the
  current traceroute/ping process while displaying a Help menu. However,
  this pause does not cause excess CPU use and normal function and CPU
  use are resumed when leaving the Help screen.

  sudo apt-cache policy mtr-tiny
  mtr-tiny:
    Installed: 0.85-3
    Candidate: 0.85-3
    Version table:
   *** 0.85-3 0
          500 http://mirrors.advancedhosters.com/ubuntu/ vivid/main amd64 Packages
          500 http://mirror.symnds.com/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

  uname -a
  Linux mach 3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Kubuntu 15.04 64bit

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