On 21/06/2021 15:17, Jiří Činčura wrote:
> Hi *,
>
> I think I have an example of memory leaking when using external engine plugin
> (3.0.7, 4.0.0).
>
> Here's as simple implementation as I can make it (sorry for probably
> non-idiomatic C++ code):
> https://gist.github.com/cincuranet/aa207081dc0d44e5d06c1a4890019307 . Then I
> create a dummy function in a database `CREATE FUNCTION TEST RETURNS INTEGER
> ENGINE MEMORYDEMO`. Finally I run `select test() from rdb$database where 0=1`
> in a loop using isql (open-execute-close) using simple script (in this case
> PowerShell flavor) below. Given the `0=1` the function is actually never
> called (and for good measure I have `exit(EXIT_FAILURE)` there), but at least
> the plugin is used.
>
> while ($true) {
> 'select test() from rdb$database where 0=1;' | & $isql -u sysdba -p
> masterkey 'localhost:memory.fdb';
> }
>
> This results in this memory usage (and as far as I can tell from couple of
> long runs, it keeps growing):
> https://snipboard.io/g5Lzya.jpg
>
> Am I doing something wrong? Or is this a bug?
>
I'm testing with the example function:
create function sum_args (
n1 integer,
n2 integer,
n3 integer
) returns integer
external name 'udrcpp_example!sum_args'
engine udr;
select sum_args(1, 2, 3) from rdb$database where 1 = 0;
I put breakpoint in UdrEngine.cpp here:
~SharedFunction()
{
engine->deleteChildren(children);
}
And engine calls it.
Can you do the same test using sum_args?
Adriano
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