Benchmarks

[William Lovaton]

Hi Ingo,

Very useful explanation, thank you.  What packages provides sar and
iptraf?, I can't manage to find them.

Right now I have this on my system... could you give us some analysis
please?? (RH9 2.4.20-28.9smp)


08:37:44  up 7 days,  1:39,  1 user,  load average: 30,75, 35,62, 34,06
270 processes: 239 sleeping, 31 running, 0 zombie, 0 stopped
CPU0 states:  90,0% user   9,0% system    0,0% nice   0,0% iowait   0,1%
idle
CPU1 states:  87,0% user  12,0% system    0,0% nice   0,0% iowait   0,1%
idle
CPU2 states:  85,1% user  14,0% system    0,0% nice   0,0% iowait   0,0%
idle
CPU3 states:  84,0% user  14,0% system    0,0% nice   0,0% iowait   1,0%
idle
Mem:  2322992k av, 1215588k used, 1107404k free,       0k shrd,   56524k
buff
                    486768k actv,  635060k in_d,    5040k in_c
Swap:  681336k av,       0k used,  681336k free                  697300k
cached
                                                                                
  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU
COMMAND
7882 root      15   0  5372 5372  3704 S    99,9  0,2 349:44   1 httpd
8301 root      16   0  1320 1320   868 R     4,4  0,0   0:39   2 top




-William



El vie, 30-04-2004 a las 22:41, Ingo Molnar escribió:
> * William Lovaton <williama_lovaton at coomeva.com.co> wrote:
> 
> > Load average is a good number to look at.  The thing is that a 1.5 load
> > means there are almost 2 processes in execution state. [...]
> 
> the load also includes processes in 'uninterruptible sleep' - i.e. 
> processes that are waiting for some sort of definitive, driver-related
> IO event, such as disk IO or network IO.
> 
> Newer kernels (2.6, or vendor kernels with the 'iowait patch'
> backported) also have the iowait stat:
> 
>  05:17:02  up 1 day, 21:43, 15 users,  load average: 0.61, 0.25, 0.19
> 74 processes: 72 sleeping, 2 running, 0 zombie, 0 stopped
> CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
>            total    3.4%    0.0%    5.2%   0.0%     0.0%   10.0%   81.4%
> 
> ('softirq' overhead is typically caused by networking overhead, 'iowait'
> is idle time while there is pending network/disk IO, and 'idle' is pure
> idle time when nothing happens in the system.)
> 
> > > > > Machine is pushing 25.34mb/sec
> > > > How do you get this number??  (25.34mb/sec)
> > > right off the switch port.
> > 
> > Neat!  I'll talk with the net guy here.  ;-)
> 
> there are soft stats on the Linux side too:
> 
> 	sar -n DEV 10 0
> 
> will display summary per-interface tx/rx statistics every 10 seconds. 
> 
> Also, 'iptraf' is a pretty handy tool too, for simple traffic analysis.
> 
> 	Ingo