RE: Genero web services (Genero Application Server)

Bart,



Think of it this way,  The application server is going to start START number of
DVMs (each takes a license) as web service servers waiting to service requests.
After some time out if the DVMs are not busy the application server will reduce the
number of DVMs to MIN_AVAILABLE, and as they get busy it will start no more than
MAX_AVAILABLE.  The application server will queue the requests until either they
timeout and return an error or one of the DVM's frees up to handle the requests.



The idea is for scalability.  You may have a steady load that requires START number
of DVMs but during slow times you would allow the number to fall to min, but you
may not want to fire off more than max.  These three settings give you that
flexibility.



HTH,

Don Bizzell



   _____

From: [email protected] [mailto:[email protected]] On Behalf Of
Bart Orlowski
Sent: Wednesday, March 16, 2005 10:19 AM
To: [email protected]
Subject: [fourjs-users] Genero web services (Genero Application Server)



Hello,

I have a question about the GAS (Genero Application Server) configiration file -
as.xcf



The EXECUTION_COMPONENT/POOL section/element has 3 parts/elements:

This section is only applicable to web services.

  I provided description of these elements (quote from the GAS manual):

  START - Zero or one START.

               This element specifies the minimum number of Virtual Machines
attached to this Web Service.Constraint: START <= MAX_AVAILABLE

  MIN_AVAILABLE - Zero or one MIN_AVAILABLE.

                              Specificies the minimum number of available Virtual
Machine attached to a Web Service.

                              It can be either lower or greater than the value
specified by START.Constraint: 0 <= MIN_AVAILABLE <= MAX_AVAILABLE



MAX_AVAILABLE - Zero or one MAX_AVAILABLE.

                              Specifies the maximum number of available Virtual
Machinesattached to a Web Service.

                              Constraints:START <= MAX_AVAILABLE MIN_AVAILABLE <=
MAX_AVAILABLE.





Can someone please explain to me the purpose of the START and the MIN_AVAILABLE
elements - (is it the minimum number of virtual machines ALWAYS available to a web
service - which would mean that GAS reserves appopriate number of licences? - I am
not sure....., and what is the meaning of the START element?)

Thank you for you help...



Bart Orlowski

Software Developer

Versaterm Inc.

Tel. (613) 820-0311

Email:  <mailto:[email protected]> [email protected]