Is there a formula for calculating max entries on a dataqueue ?

Dear all,

Is there a formula that an be used to calculate the maximum no of messages that
can be placed on a dataqueue ?

I thought it may be something like:

     MaxEntries = MaxQueueSize divided by (x + y + z)

where
  x=max entry length,
  y=some constant, if sender-id is *yes  (36?)
  z=key-length

Also, until recently I thought that the max size for a dataqueue was 16Mb, but
when doing two tests for the above I got one queue which went to just under 20mb
before it reached max capacity, and the other went to over 22mb.

Is there another different formula for calculating what the max size (in bytes,
not messages) that a queue will reach before it is at capacity ?

I guess it will be a multiple of either 4k or 8k, but why did my tests produce
different values before the queue max-ed out ?

One test was for entry length 100, the second for entry len 300.
Both were non-keyed, sender-id(*no)

thanks
Nigel.



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