(Related to my earlier post on mod_status.)
Found this useful tidbit today from IBM HTTP Server Performance Tuning:
For IBM HTTP Server 7.0 and later, mod_mpmstats is enabled automatically.
This is a quick way to look at your IHS load over time.
The fields logged are described in the table below:
field |
description |
rdy (ready) |
the number of web server threads started and ready to process new client connections |
bsy (busy) |
the number of web server threads already processing a client connection |
rd (reading) |
the number of busy web server threads currently reading the request from the client |
wr (writing) |
the number of busy web server threads that have read the request from the client but are either processing the request (e.g., waiting on a response from WebSphere Application Server) or are writing the response back to the client |
ka (keepalive) |
the number of busy web server threads that are not processing a request but instead are waiting to see if the client will send another request on the same connection; refer to the KeepAliveTimeout directive to decrease the amount of time that a web server thread remains in this state |
log (logging) |
the number of busy web server threads that are writing to the access log |
dns (dns lookup) |
the number of busy web server threads that are performing a dns lookup |
cls (closing) |
the number of busy web server threads that are waiting for the client to acknowledge that the entire response has been received so that the connection can be closed |
Tags: 
ihs
mpmstats
stats
apache
httpd