Re[2]: top info

[Corin Langosch <corinl@gmx.de>]

Hi!

thanks a lot for the fast reply!

so that basically means i should replace my IDE drive
with a SCSI drive, because much of my cpu time is spend
for IO-requests? does SATA help here?

Corin

Sunday, May 30, 2004, 6:08:13 PM, you wrote:
PB> On Sunday 30 May 2004 16:58, Corin Langosch wrote:
>> Hi,
>>
>> i'm now sucessfully running our mysql-server with debian
>> pure64 for two days :-). when running top the summary output
>> is something like this:
>>
>> --
>> top - 17:53:43 up 2 days, 43 min,  1 user,  load average: 0.31, 0.77, 0.70
>> Tasks: 212 total,   1 running, 211 sleeping,   0 stopped,   0 zombie
>>  Cpu0 :  7.8% us,  4.9% sy,  0.0% ni, 68.6% id, 18.6% wa,  0.0% hi,  0.0%
>> si Cpu1 :  9.0% us,  3.0% sy,  0.0% ni, 57.0% id, 31.0% wa,  0.0% hi,  0.0%
>> si Mem:   4068456k total,  4052936k used,    15520k free,    98372k buffers
>> Swap:  2077704k total,        0k used,  2077704k free,  2761232k cached --
>> 'us' means user, 'sy' means system, 'id' means idle, but what does
>> 'ni','hi', 'si' and especially 'wa' mean? i see that most often 'wa' has
>> relatively high values.

PB> ni = nice
PB> hi = ? Probably hard interrupt
PB> si = ? Probably soft interrupt
PB> wa = IO wait

PB> wa typically has high values if the machine is waiting to IO to complete, 
PB> doesn't have anything else to do.

PB> IIRC the more detailed split was introduced in 2.5/6 kernels, and is not amd64
PB> specific.

PB> Paul