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Question by Gurpreet M. · Jun 30, 2014 at 05:49 PM ·

Linux kernel commands/tools used by agents

What Linux kernel commands/tools do dynaTrace agents use under the hood to get the system metrics for CPU, Memory etc. Do they use the /proc files?

Need the information as we're experimenting using dynaTrace agents on Linux Containers and want to make sure the agents report the system metrics for the Containers and not the underlying hardware.

Thanks!

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Answer by Roman S. · Jun 30, 2014 at 06:37 PM

Hi,

The host monitoring metrics (that you can see in the Infrastructure view) are using the /proc files. See below for details:

Best, Roman

  Metric Description Linux
CPU Metrics System Usage % CPU spent for system/kernel space execution /proc/stat
  User Usage % CPU spent for user space execution /proc/stat 
  Idle % CPU spent idle /proc/stat 
  Wait (I/O) % CPU spent in waiting for I/O /proc/stat 
  Load Number of processes running or waiting. "Load" on *nix Platforms, "Processor Queue Length" on Windows Platforms sysinfo(2) 
Memory Metrics Max   /proc/meminfo 
  Available The available memory is defined as: free+Cached+Buffers  /proc/meminfo
  Free    
  Used   /proc/meminfo 
  Commited there are two forms of used memory. with and without bufferedram. Used is really used by programs and can not be freed without swapping. Committed is including buffers and caches which are freed if needed.   
  Cached+Buffers Can be taken from sysinfo: bufferedram   
Swap/Pagefile Metrics Free   /proc/meminfo 
  Used   /proc/meminfo 
  Max   /proc/meminfo 
  Swap Rate/Page faults major page faults only
(requiring disk access)
/proc/vmstat 
Network Metrics (per interface) Rate In   /sys/class/net/*/statistics/rx_bytes
  Rate Out   /sys/class/net/*/statistics/tx_bytes
  Bandwidth   /sys/class/net/*/speed 
Disk Metrics(per file system) Total   /etc/mtab 
      statvfs64(3) 
  Free   /etc/mtab 
      statvfs64(3) 
  Used   /etc/mtab 
      statvfs64(3) 
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avatar image Allan S. · Jul 02, 2014 at 09:04 AM 0
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That's awesome information. Thank you.

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Answer by Jibi U. · Sep 11, 2014 at 09:41 AM

How does DT get similar data from IBM AIX?

 

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Answer by Gurpreet M. · Jul 01, 2014 at 05:34 AM

Thanks Roman! This is what I was looking for!

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