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Operating Systems AIX Truss output
# 1  
Old 11-27-2013
Truss output
Hello,

I'm using AIX 5.3.12.5 and trying to understand truss output.
I'm running a job with real time of 16 minutes but only 4 minutes of CPU time. I'm trying to understand what the process is doing.

I'm getting a lot of
kread,
kpread,
kwrite,
kpwrite...

Code:
localhost:~ x$ grep kread truss.log | wc -l
   90503
localhost:~ x$ grep kwrite truss.log | wc -l
  164596
localhost:~ x$ grep kpwrite truss.log | wc -l
    5817
localhost:~ x$ grep kpread truss.log | wc -l
    5817
localhost:~ x$ wc -l truss.log 
  460125 truss.log
localhost:~ x$ grep select truss.log | wc -l
   65584

What means each one of this calls?

Thanks a lot
Last edited by Corona688; 11-27-2013 at 04:55 PM..
# 2  
Old 11-27-2013
kread and kwrite look like file or device I/O, the kernel side of read() or write() calls. I'm less sure of kpread and kpwrite, it might be memory paging, but they're not significant.
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