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Full Discussion: Multiple Processors and Load Average
Special Forums UNIX and Linux Applications Infrastructure Monitoring Multiple Processors and Load Average Post 302841865 by indiansoil on Thursday 8th of August 2013 05:02:41 AM
Old 08-08-2013
Multiple Processors and Load Average
The following information shows that there are in total 4 Processors on this machine:

Code:
$ grep -i name /proc/cpuinfo
model name      : Dual-Core AMD Opteron(tm) Processor 2218
model name      : Dual-Core AMD Opteron(tm) Processor 2218
model name      : Dual-Core AMD Opteron(tm) Processor 2218
model name      : Dual-Core AMD Opteron(tm) Processor 2218

Does the command top reveal this information clearly?

Code:
$ top -b -n 1 | head
top - 08:52:40 up 1516 days, 16:57,  2 users,  load average: 1.12, 1.26, 1.32
Tasks:  97 total,   1 running,  96 sleeping,   0 stopped,   0 zombie
Cpu(s): 18.2%us,  3.4%sy,  0.0%ni, 77.9%id,  0.3%wa,  0.0%hi,  0.3%si,  0.0%st
Mem:  32967244k total, 32844284k used,   122960k free,   216240k buffers
Swap:  2096472k total,   105872k used,  1990600k free,  2005636k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
25437 root      23   0 22.7g  22g 9272 S 142.9 70.6  42140:15 java

Besides, the load average is:
1.12, 1.26, 1.32
over 1 which means over 100% CPU utilization. But what I understand is if there are 4 processors then the value of 1 would mean only 25% CPU utilization in total. Is this correct?

Next, the top command shows that the following java process is utilizing 142.9% of the CPU resource:

Code:
PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
25437 root      23   0 22.7g  22g 9272 S 142.9 70.6  42140:15 java

Is this value relative to the total capacity of the CPU (with all its 4 processors)?

Can you please help me make it clear to myself what those things (4 processors, load average, 142.9 %CPU for Java) are showing exactly? How do they relate to each other?
 

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LEARN ABOUT NETBSD

amdtemp

AMDTEMP(4)						   BSD Kernel Interfaces Manual 						AMDTEMP(4)

NAME

     amdtemp -- AMD CPU on-die digital thermal sensor

SYNOPSIS

     amdtemp* at pchb?

DESCRIPTION

     The amdtemp driver provides support for the on-die digital thermal sensor present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, and AMD
     Fusion CPUs.

     These sensors were officially introduced in AMD K8 Revision F processors, and provide 0.5 degC accuracy.  Precision was improved in Revision
     G chips, which provide two more bits for 0.25 degC steppings.  Each core has two temperature sensors, and there are up to two cores per CPU
     socket.

     AMD Barcelona, AMD Phenom, AMD Griffin, and AMD Fusion provide 0.125 degC accuracy and provide one temperature sensor for each CPU socket.

     The amdtemp driver reports temperatures through the envsys(4) API.

	   Sensor	 Units	  Typical Use
	   CPUN sensor0  uK	  cpuN temperature

SEE ALSO

     envsys(4), envstat(8), powerd(8)

HISTORY

     The amdtemp driver first appeared in OpenBSD 4.4 named ``kate''.  It was then ported to NetBSD 5.0.  The driver has been renamed with support
     for newer AMD CPUs.

AUTHORS

     The amdtemp driver was written by Constantine A. Murenin <cnst@openbsd.org> whilst at the University of Waterloo.	It was adapted to NetBSD
     by Christoph Egger.

BSD
								   March 2, 2012							       BSD
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