Re: no operf after installation

On 02/11/2015 12:17 PM, Lentes, Bernd wrote:
> Hi,
> 
> i'm new to operf. I have a virtual system (SLES 10 SP4, kernel 2.6.16.60-0.103.1-smp, 64bit) running on a SLES 11 SP3 host using kvm.
> The virtual system always has some percent in top for the softirqs. (5% - 15%) and I don't know why. I hoped operf might help me by finding the reason for it. I downloaded version 1.0.0 from the sourceforge server, did "./configure; make; make install", everything went fine, but I have no operf on the virtual box. I searched the whole disk. Also I'm missing the man pages.
> Maybe the version is too recent for my system ?
> 
> Thankful for any help.
> 
> 
> Bernd

Hi Bernd,

A 2.6.16 kernel is too old to provide the perf infrastructure required by operf unless it has been patched.  It might be possible to run opcontrol on the guest. I know this can work with RHEL7 as a host and making the guest vm identify cpu as the same as the host sees, but I don't know if this work on SLES.

You might be able to have a systemtap script (https://sourceware.org/systemtap/) provide some information what is going on there.  There are probably prebuild versions of systemtap available for SLES11 and people have built systemtap on OpenSUSE11 (https://sourceware.org/systemtap/wiki/SystemTapOnopenSUSE11).
Something like the attached systemtap script might help.  Below is an example run on a x86_64 RHEL5 system:

[wcohen@localhost ~]$ stap --all-modules softirq.stp 
action:net_tx_action min:0us avg:1us max:12us count:579
action:run_timer_softirq min:0us avg:4us max:136us count:20056
action:net_rx_action min:0us avg:120us max:7557us count:708
action:tasklet_action min:0us avg:1us max:17us count:921


-Will

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#!/bin/env stap

global start, intervals

probe softirq.entry { start[tid()] = gettimeofday_us() }

probe softirq.exit
{
  t = gettimeofday_us() 
  old_t = start[tid()]
  if (old_t) intervals[action] <<< t - old_t
  delete start[tid()]
}

probe end
{
  foreach (i in intervals) {
  printf("action:%s min:%dus avg:%dus max:%dus count:%d\n",
  	 symname(i),
         @min(intervals[i]), @avg(intervals[i]), @max(intervals[i]),
         @count(intervals[i]))
  }
}