On 4/28/07, Arnab Ganguly < aganguly01@xxxxxxxxx> wrote:
> Hi All,
> I have some queries on the StartServers param.As it says "The StartServers
> directive sets the number of child server processes created on startup. As
> the number of processes is dynamically controlled depending on the load,
> there is usually little reason to adjust this parameter" from the Apache
> page.I wanted to know suppose I make the StartServers as 1.During the
> startup time only one active child process gets created.But after running it
> for a day or two a new daemon process gets launched apart from the other
> existing one.It would be nice if you can tell me as what point due to the
> load does Apache spawns another daemon?The value of ServerLimit I kept is
> one but still the behavior is same.
StartServers really only has any effect within the first few seconds
of the server's life. After that, the number of processes is
determined by the number of client requests along with
MinSpareServers/MaxSpareServers/MaxClients/ServerLimit. It is,
however, very normal to have one or two extra processes above
MaxClients/ServerLimit. This would be the parent/control process and
possible a CGI daemon process depending on the CGI module used.
>
> One more question I have is about the ListenBackLog.Is the request is always
> read from this queue or the queue comes into the picture only when the Idle
> thread count is zero?Suppose the ListenBackLog is full what would happen to
> the request received by Apache?
A normal server will immediately pick up any connectoin off the listen
queue, so it will typically be empty. If it becomes full (because
MaxClients/ServerLimit is not high enough), then apache will never see
the requests. They will be rejected by the OS at the TCP/IP level
(connection refused, I believe).
>
> If Idle thread count is zero do still this ListenBackLog gets filled for the
> requests are coming and the request are read from this queue only.Looking
> forward for response.
Something like that, yes.
Joshua.
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