fixed leak

[jose-d]

There is memory leak reproducible in case when Class object instance is ended with some Exception.

Example:

input_dict['non_existing_param'] = 1000  # non existing param will cause exception
class_run.set(input_dict)
class_run.compute()

In this example, Class will complain with an exception bcs. of non-existing parameter, but still few bytes will stay in memory.

Depending on amount of exceptions, hundreds of GBs leak in few days.

With provided patch we observed much better behavior.

Here is graph of memory usage on compute node running code with standard Class: https://www.fzu.cz/~jose/temp/leak_grafana.png (3 days to OOM)

[jose-d]

@lesgourg: hi, what we can do to get this merged? Or UR working on own fix?

[lesgourg]

Sorry, I promise I'll do it asap! Next week I will be working on the code and I'll commit your fix.

[jose-d]

np, thx for info!