Build system benchmark

[Scott A Crosby <crosby at qwes dot math dot cmu dot edu>]

I've run a benchmark of building 2.95.2 on my machine. It's a P3-500
laptop with 192MB of RAM. I'm using process accounting to see what
programs are run, their CPU time (in minutes), and total number of
invocations. (A '*' after a name is for a process which forks, but does
not exec, like a subshell.) 

As the full list is pretty long, I'm omitting most of the lines. These
results were collected on a non-idle system.

With configuring, 25% of the time is spent in spent in system, and 75% in
user. I wonder how much of that system CPU time is fork/exec overhead.
5000 processes in 40 seconds is pretty impressive. Overall, only a minute
is spent in system mode.

I hope this helps people for figuring out where gcc's build time is spent.

------  Just ./configure
   COUNT                   CPU TIME 
    5150     285.05re       0.53cp         0avio       369k   *TOTAL*
     618      42.88re       0.21cp         0avio       260k   sed
      92       7.18re       0.07cp         0avio       614k   ld
      23      79.05re       0.05cp         0avio       472k   sh
     130       4.30re       0.04cp         0avio       737k   cc1
    1795      40.82re       0.03cp         0avio       484k   sh*
     174       3.25re       0.03cp         0avio       298k   cpp
     525       2.85re       0.02cp         0avio       249k   cat
      20       2.13re       0.02cp         0avio       420k   kpsewhich
     689       2.42re       0.02cp         0avio       252k   rm
     131       1.40re       0.01cp         0avio       464k   as
     173      17.10re       0.01cp         0avio       268k   gcc
      23      67.12re       0.01cp         0avio       355k   ***other
     173       3.83re       0.01cp         0avio       277k   grep
     114       0.73re       0.00cp         0avio       252k   tr
     123       0.45re       0.00cp         0avio       255k   mv
      91       7.62re       0.00cp         0avio       269k   collect2


--------- './configure' and 'make bootstrap'
   COUNT                  CPU TIME 
   18890   13848.47re      18.94cp         0avio       418k   *TOTAL*
    1314    1529.43re      15.00cp         0avio      1019k   cc1
    1470     150.42re       1.19cp         0avio       398k   cpp
    1367      97.78re       0.96cp         0avio       508k   as
     273      39.87re       0.34cp         0avio       688k   ld
      53      34.75re       0.32cp         0avio      1213k   cc1plus
    1699      54.32re       0.29cp         0avio       261k   sed
     579    3115.78re       0.15cp         0avio       445k   sh
    1240    1702.33re       0.10cp         0avio       270k   xgcc
    5280     230.87re       0.10cp         0avio       467k   sh*
      89    6544.78re       0.09cp         0avio       329k   make
    1429       5.25re       0.04cp         0avio       253k   rm
     995       5.78re       0.04cp         0avio       249k   cat
     114       3.95re       0.04cp         0avio       399k   ar
     448      13.72re       0.03cp         0avio       252k   tail
     331     169.03re       0.02cp         0avio       268k   gcc
     329       5.87re       0.02cp         0avio       278k   grep
     254       2.32re       0.02cp         0avio       251k   cmp
     316       1.87re       0.01cp         0avio       256k   mv
     272      42.00re       0.01cp         0avio       268k   collect2
     187       1.27re       0.01cp         0avio       252k   tr
     117       0.47re       0.00cp         0avio       251k   touch

Scott


--
No DVD movie will ever enter the public domain, nor will any CD. The last CD 
and the last DVD will have moldered away decades before they leave copyright. 
This is not encouraging the creation of knowledge in the public domain.