How to interpret server-status from mod_status module?

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I am using Apache 2.0.48 in prefork MPM mode and am not sure how to
interpret the stat which shows "accesses this connection/child/slot".
What is a "slot" ?    The server-status shows 400 slots with most of them
being "open slot with no process" and  the rest which is  less than 30
workers being active.    Does it mean at some point in time there were 400
active workers and hence these slots were created?
Since the number of accesses/slot against the busy workers is of the order
of 40-50k, was wondering if forcing a value of say 10k on
MaxRequestsPerChild would help with performace? Most of the connections
being handled by this webserver are not persistent.

The configuration for the prefork MPM module is as follows:
StartServers         5
ServerLimit        700
MinSpareServers      5
MaxSpareServers     10
MaxClients         400
MaxRequestsPerChild  0


Thanks

Ramdas




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