New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:

I think that the process of running bigmem tests should be improved.

1. Every bigmem test should run in separate process. It's effect on memory 
fragmentation shouldn't affect other tests.

2. Only one bigmem test should be run at the same time. Otherwise several 
parallel bigmem tests  can exhaust RAM and lead to swapping. In multiprocessing 
mode the process running a bigmem test should send a signal to other processes, 
wait until they finished their current tests and paused, run a bigmem test, and 
send a signal to other processes that they can continue.

3. The hard limit of addressed memory should be set for every bigmem test, 
according to the declared requirements. It is better to crash one test and 
report the failure, than hang on swapping.

4. All other tests should be run with the limit set to 2 GiB (or 1 GiB?). This 
will help to find memory consuming tests which should be made bigmem tests.

5. The maxrss of the process running a bigmem test should be reported in 
verbose mode after finishing a test.

----------
components: Tests
messages: 303729
nosy: haypo, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Improve bigmem tests
type: enhancement

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31695>
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