[tahoe-dev] oprofile on http://webapi.allmydata.com

[zooko]

Folks:

I ran oprofile on the main WAPI server for allmydata.com, for just a  
few minutes during a time of heavy load (100% CPU for minutes).

These were all the entries with > 1% of the CPU time:

samples  %        image name               app name         symbol name
4665864  82.4815  python2.5                python2.5         (no  
symbols)
307184    5.4303  libcrypto++.so.6.0.0     libcrypto++.so. 
6.0.0         (no symbols)
195027    3.4476  libc-2.6.1.so            libc-2.6.1.so         (no  
symbols)
96293     1.7022  libcrypto.so.0.9.8       libcrypto.so.0.9.8          
(no symbols)
84078     1.4863  libz.so.1.2.3.3          libz.so.1.2.3.3          
(no symbols)


Later, I left oprofile running for a couple of hours.  These were all  
the entries with > 1% of the CPU time:

23833241 61.4448  python2.5                python2.5                 
(no symbols)
4319186  11.1353  libcrypto++.so.6.0.0     libcrypto++.so.6.0.0      
(no symbols)
2282388   5.8843  libcrypto.so.0.9.8       libcrypto.so.0.9.8        
(no symbols)
1678020   4.3261  libz.so.1.2.3.3          libz.so.1.2.3.3           
(no symbols)
1640397   4.2291  libc-2.6.1.so            libc-2.6.1.so             
(no symbols)


One thing that is nice to see is that zfec is not in this list.  Here  
is the CPU time spent in the C module of zfec in the second  
measurement (a couple of hours long):

31768     0.0819  _fec.so                  _fec.so                   
(no symbols)

That's 0.08% of the CPU spent in _fec.so.


Regards,

Zooko