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

[zooko]

I wonder what the libz is for.  I suppose maybe it is used on the  
HTTP connections?

Regards,

Zooko

On Apr 15, 2008, at 7:53 PM, zooko wrote:
> 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
>