Thanks for the observations. I must appologize for the typo of "can_read()" introduced by my attempt to summarize the actual code. I really use can_read(0) because I do lots of work when there is no input to process. You did help me find a bug in my code though. The new profile times appear close. Unless I'm missing something here, I seams that the time is taken by checkintg to see if there are ready sockets and gathering those sockets. 
  User+System Time = 1255.587 Seconds
Exclusive Times
%Time ExclSec CumulS #Calls sec/call Csec/c  Name
 56.9   714.4 733.43 341511   0.0002 0.0002  IO::Select::can_read
 4.47   56.09 87.694 364493   0.0000 0.0000  BuddyUser::log
 3.96   49.68 1294.3 337516   0.0000 0.0004  BuddyUser::ckUser
 3.13   39.35 772.78 341511   0.0000 0.0002  HttpNb::ios_can_read

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In reply to Re^2: Socket IO with large (>1000) numbers of open sockets by Ray Smith
in thread Socket IO with large (>1000) numbers of open sockets by Ray Smith

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