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centos - Unusual load average for an idle workstation

I have a new workstation with an unusual high load
average. The machine specs are:




  • Xeon
    CPUs

  • 256 GB of RAM

  • 4 x 512
    GB SSD connected to a LSI2108 RAID controller (in raid
    5)



I have installed
CentOS 6.5 64 bit from the live cd, configured the partitions (using LVM), the network,
the users/groups, and installed some software like development tools and
MATLAB.
The workstation load average, after few minutes from the boot, has a
value ranging from 0.5 to 0.9. But it is not doing anything.

Thus I
cannot understand why the load average is so
high.



Could you help me to diagnose this
issue?



Here are some
information:



uname
-a



Linux delta.grid
            2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64
            GNU/Linux



top



top
            - 15:44:53 up 22 min, 1 user, load average: 0.84, 0.69, 0.39
Tasks: 729 total,
            1 running, 728 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy,
            0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 264422908k total,
            1986152k used, 262436756k free, 25640k buffers
Swap: 134217720k total, 0k
            used, 134217720k free, 147784k cached

 PID USER PR NI VIRT RES SHR
            S %CPU %MEM TIME+ COMMAND 

 4094 root 20 0 15564 1764 944 R 0.3 0.0
            0:01.44 top 
 1 root 20 0 19364 1536 1228 S 0.0 0.0 0:01.26 init 
 2
            root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd 
 3 root RT 0 0 0 0 S 0.0 0.0
            0:00.27 migration/0 
 4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
            
 5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 
 6 root RT 0 0 0
            0 S 0.0 0.0 0:00.00 watchdog/0 
 7 root RT 0 0 0 0 S 0.0 0.0 0:00.14
            migration/1 
 8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1 
 9
            root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1 

 10 root RT 0 0 0 0
            S 0.0 0.0 0:00.00 watchdog/1 
 11 root RT 0 0 0 0 S 0.0 0.0 0:00.00
            migration/2 
 12 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/2 
 13
            root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/2 
 14 root RT 0 0 0 0 S 0.0 0.0
            0:00.00 watchdog/2 
 15 root RT 0 0 0 0 S 0.0 0.0 0:00.03 migration/3
            
 16 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/3 
 17 root 20 0 0
            0 0 S 0.0 0.0 0:00.00 ksoftirqd/3 
 18 root RT 0 0 0 0 S 0.0 0.0 0:00.00
            watchdog/3 
 19 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/4
            

 20 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/4 
 21
            root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/4 
 22 root RT 0 0 0 0 S 0.0 0.0
            0:00.00 watchdog/4 
 23 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/5
            
 24 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/5 
 25 root 20 0 0
            0 0 S 0.0 0.0 0:00.00 ksoftirqd/5 
 26 root RT 0 0 0 0 S 0.0 0.0 0:00.00
            watchdog/5 
 27 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/6 
 28
            root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/6 
 29 root 20 0 0 0 0 S 0.0 0.0
            0:00.00 ksoftirqd/6 

 30 root RT 0 0 0 0 S 0.0 0.0 0:00.00
            watchdog/6 
 31 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/7 
 32
            root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/7


free
-m



 total used free shared buffers
            cached
Mem: 258225 1939 256286 0 25 144
-/+ buffers/cache: 1769
            256455

Swap: 131071 0
            131071


iotop



Total
            DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s
 TID PRIO USER DISK READ DISK
            WRITE SWAPIN IO> COMMAND 
 1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            init
 2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd]
 3 rt/4
            root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/0]

 4 be/4 root
            0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0]
 5 rt/4 root 0.00 B/s 0.00 B/s
            0.00 % 0.00 % [migration/0]
 6 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/0]
 7 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/1]
 8 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/1]
 9 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/1]
 10 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/1]
 11 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/2]
 12 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/2]
 13 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/2]

 14 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/2]
 15 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/3]
 16 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/3]
 17 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/3]
 18 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/3]
 19 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/4]
 20 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/4]
 21 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/4]
 22 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/4]
 23 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/5]

 24 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/5]
 25 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/5]
 26 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/5]
 27 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/6]
 28 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/6]
 29 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/6]
 30 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/6]
 31 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/7]
 32 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/7]
 33 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/7]

 34 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/7]
 35 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/8]
 36 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/8]
 37 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/8]
 38 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/8]
 39 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/9]
 40 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/9]
 41 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/9]
 42 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/9]
 43 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/10]

 44 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/10]
 45 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/10]
 46 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/10]
 47 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/11]
 48 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/11]
 49 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/11]
 50 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [watchdog/11]
 51 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/12]
 52 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [migration/12]
 53 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 %
            [ksoftirqd/12]



vmstat
5 5



procs
            -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r
            b swpd free buff cache si so bi bo in cs us sy id wa st
 0 0 0 262437312 25728
            147808 0 0 3 0 4 5 0 0 100 0 0 
 0 0 0 262437296 25728 147808 0 0 0 0 58 101 0
            0 100 0 0 
 1 0 0 262437312 25728 147808 0 0 0 0 64 117 0 0 100 0 0
            
 2 0 0 262437312 25728 147808 0 0 0 0 48 95 0 0 100 0 0
            

 1 0 0 262437200 25728 147808 0 0 0 0 58 117 0 0 100 0
            0


I have not enough
space to copy/paste the output of 'ps axf', but:
- there are no processes in D
state (disk sleep - uninterruptible)
- all the processes are in S state except
the monitoring tool executed (like top or
iotop)



Thanks in advance for your
help!

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