Vikram,

 I am using "sample map" as the base layer and 100 overlays(single tile).
> Total no. of request is around 125 to geoserver on zoom/pan for one time.
> This map will be used by n number of users.
>

Probably adding a bit less then 100 layers to the map component will solve
most of your problems :).

If you need all of those layers try setting 'visibility=false' to most of
them this may avoid sending hundreds of queries for not visible (z-index)
layers.

To understand if you need a cluster of geoserver, could you specify what
will be the size of 'n' (10, 100, 1000, 10.000 or more)?



>  *These are my problems....*
> 1. Geoserver is not responding properly
> 2. Responses is time consuming
>

Mmm this may never (or very rarely) happen.... Which kind of store you are
using? (huge shapefile?)
Consider pre-processing the data before ingestion to optimize runtime
queries.
btw which GeoServer version are you using?


>
> *My queries.....*
> 1. How to control the above mentioned requests...?
>

Consider also installing the control flow module:
http://docs.geoserver.org/stable/en/user/extensions/controlflow/index.html


>  2. Right now I am accessing GeoWebCache from this URL 
> *"../geoserver/gwc/service/wms".
> *How to access cached tiles directly...?
>

Look at this example:
http://dev.openlayers.org/sandbox/tschaub/gwc/examples/geowebcache.html

Try also WMTS:
http://openlayers.org/dev/examples/wmts.html



> 3. How to configure Geoserver for production environment. I had a glance
> in documentation of geoserver about configuring. Is that enough or some
> more modification is needed ?
>

Read carefully this documentation:
http://docs.geoserver.org/stable/en/user/production/index.html

Generally speaking applying those suggestion you may have a quite
performant environment, anyhow
if you need more support for your production environment you may also
consider contacting technical commercial support:
http://geoserver.org/display/GEOS/Commercial+Support


Cheers,
Carlo

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