[fpc-pascal] New object created in custom pool

[JoshyFun]

Hello Jonas,

Tuesday, October 28, 2008, 4:58:04 PM, you wrote:

JM> 100 bytes and smaller are most certainly handled using pools by FC's
JM> heap manager.

This code is partially inherited from a Delphi one, so the test has
been performed a few months ago using D7, maybe the fpc behavior is
better.

>> block some big objects are created and many times allocation pages
>> seens to be only half filled using the calculator
JM> The calculator and which base size? Did you call instancesize to see
JM> how much space is required for each instance?

The rough calculation has been performed (more or less, you know some
months ago, but now I'm porting this piece of code) using the
instancesize rounded to 8 bytes align and running a synthetic do/while
that tries to simulate the creating/destroy after around 12 hours of
heavy load. The final result taking the currently allocated memory (at
the end) and adding 2 pointers for block index was that the used
memory is around 80% more than the needed.

Running the same do/while but without destroy any object and creating
first the small objects and finally the large objects to end with the
same amount of objects says that the memory occupation was only around
15% in excess.

I'll search the hard disk for the test routine, maybe it is still
somewhere in the HD.

-- 
Best regards,
 JoshyFun