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Full Discussion: Help in monitoring performance problem in Linux
Operating Systems Linux Help in monitoring performance problem in Linux Post 302394277 by levic on Thursday 11th of February 2010 06:42:04 AM
Old 02-11-2010
Hi,

ok, i was finally able to enable the disk statistics using sar. ( i have do add -d on /usr/lib64/sa/sa1 script.

no now i've created new PDF with ksar with all the statisics i can.
the problem is that i dont understand and know what to look for in order to understand the problem.

as you can see i'm not on a cpu problem, i have a vary high load average and high numberof runq-sz.

so, i've write down all the statistics from a specific minutes i'ev chosen. its not the specific time our machine hanged but perhaps we can see the problem in a reguler time.

Code:
CPU monitor: (0.0 - 45.0) 
   cpu used: 40% (i/o wait)
context: (0-24,000)
   cswch/s: 18,000
i/o: 
  transerf/s (0- 5000) : 3000
  block read/write (0-80,000) : 50,000
  read/write/s (0 - 5000) : 3000
memory:
  memused: 8G (100%)
  memfree: (0-770M): 380m 
memory misc:
   buffers: (0-760m) : 290m
   cached: (0-7.5G): 6.5G
swap:
   swapfree: 8G
   swapused: 40kb
 
load:
  runq-sz (0-4): 2
  plist-sz(0-350): 320
  load average (0-10) : 1mm-7.5, 5mm-6, 15mm-3
 
page:
  frmpg/s((-)400 - 400) : 200
  bugpg/s: ((-)100 - 100): -25
  campg/s ((-)400 - 400): -150 
paging: 
   pgpgin/pgpgout  /s (0-22,500) : in- 2500, out-10,000
   fault/majflt / s (0-50,000) : 2500
 
processes:
  proc/s (0-57.00): 1

disks:
  sda:
  tps/s (0-500): 280
  read/write /s (0-35,000): write- 6000, read- 27,500
  avgrq-sz (0-200): 100
  avgqu-sz (0-75): 25
  await (0-200): 100
  svctm (0-3): 2.5
  util% (0-100): 90%

sdb:
  tps/s (0-300): 200
  read/write /s (0-32,500): write- 15000, read- 3000
  avgrq-sz (0-400): 150
  avgqu-sz (0-7.5): 1.5
  await (0-150): 1
  svctm (0-10): 2
  util% (0-50): 20

md/0:
  tps/s (0-5,000): 2000
  read/write /s (0-40,000): write- 15000, read- 5,000
  avgrq-sz (0-150): 10
  avgqu-sz (0-75): 20
  await (0-300): 1
  svctm (0-20): 1
  util% (0-75): 75

tony, are you see any problem?
first i though i just need to add memory. cause its looks like he uses all the memory, byt it doesnt make any sense cause there is no paging, and i guess linux allocate all the memory but not realy using it.
perhaps its the disk problem?

any help will be appriciated!
Thanks a lot!
Last edited by levic; 02-11-2010 at 08:11 AM..
 

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LEARN ABOUT LINUX

ipcs

IPCS(1) 						     Linux Programmer's Manual							   IPCS(1)

NAME

       ipcs - provide information on ipc facilities

SYNOPSIS

       ipcs [-asmq] [-tclup]
       ipcs [-smq] -i id
       ipcs -h

DESCRIPTION

       ipcs provides information on the ipc facilities for which the calling process has read access.

       The -i option allows a specific resource id to be specified.  Only information on this id will be printed.

       Resources may be specified as follows:

       -m     shared memory segments

       -q     message queues

       -s     semaphore arrays

       -a     all (this is the default)

       The output format may be specified as follows:

       -t     time

       -p     pid

       -c     creator

       -l     limits

       -u     summary

SEE ALSO

       ipcrm(1), ipcmk(1)

CONFORMING TO

       The  Linux  ipcs  utility is not fully compatible to the POSIX ipcs utility.  The Linux version does not support the -b and -o options, but
       does support the -l and -u options not defined by POSIX. The portable application shall not use the -a, -b, -o, -l, and -u options.

AUTHOR

       krishna balasubramanian (balasub@cis.ohio-state.edu)

AVAILABILITY

       The ipcs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

Linux 0.99							  9 October 1993							   IPCS(1)
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