Re: Are indexes blown?

On 16/02/2008, Greg Smith <gsmith@gregsmith.com> wrote:

> top -bc | tee topdata
>
> That will save everything to a file called topdata while also letting you
> watch it scroll by.  Not as easy to catch the bad periods that way, the
> output is going to be a huge data file, but you'll have a log to sort
> through of everything.  Control-C to get out of there when you're bored.

Or pipe through the following awk-script to make the output
less overwhelming ... save it as top.awk

BEGIN{
  # the sort numerically sorts by memory usage percentage
  # head filters out the top 20 contenders
  command = "LC_ALL=C sort -k 10,10gr|head -20"
}
{
  # read all of top into an array
  line[NR]=$0
  last=NR
}
END{
  # print the header well-formed
  for(i=1;i<8;i++){
    print line[i]
  }
  # and do the sort & strip of the processes
  for(i=8;i<last;i++){
    print line[i]|& command
  }
  close(command, "to")
  while ((command |& getline out) > 0)
    print out
  close(command)
}

Invoke like so
top -b -d 1 | awk -f top.awk | tee topdata

Instead of the "getting bored Ctrl-C" maybe a "-n 3600" as
extra parameter to top to get roughly one hours worth of data...


Cheers,
Andrej