RE: Genero web services (Genero Application Server)

Don,

 

There was a whole discussion of this on the Genero list. Apparently,
your statement "and as they get busy it will start no more than
MAX_AVAILABLE" is not correct. The GAS will continue to start DVMs
regardless of MAX_AVAILABLE (within license constraints) but once the WS
call is finished, it will immediately tear down the DVM instance if
there are more than MAX_AVAILABLE instances running (i.e. not wait for
DVM_AVAILABLE timeout to occur before teardown).

 

NOTE: There is a "MaxLicenseConsumption" attribute of the service
element that you can set to restrict the number of licenses available to
a service.

 

I didn't understand this until a couple of days ago either. :-)

 

HTH,

 

--Pete

 

________________________________

From: [email protected] [mailto:[email protected]] On
Behalf Of Don Bizzell
Sent: Wednesday, March 16, 2005 11:54 AM
To: [email protected]
Subject: RE: [fourjs-users] 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: [email protected] <mailto:[email protected]>