luocooong commented on PR #2582:
URL: https://github.com/apache/drill/pull/2582#issuecomment-1179550719
It is hoped that this pull request will be the last one to resolve the
tricky unit test, as it has been released memory from the operating system and
has split large tests (easy to hang or crash) and small tests.
In the future, we can label the large tests that are prone to failure as
`EasyOutOfMemory`, the CI automatically starts the test with a new (cleanest
area) JVM. If everything goes well, we may even move an existing Flaky test to
that JVM.
Also, thank to @vdiravka for all his efforts.
Memory status before building and testing :
```
total used free shared buff/cache
available
Mem: 6946 522 3342 9 3082
6107
Swap: 4095 0 4095
```
Memory status after buffer release (_drop_caches_) :
```
total used free shared buff/cache
available
Mem: 6946 520 5265 9 1161
6109
Swap: 4095 0 4095
```
Memory status after building and testing :
```
total used free shared buff/cache
available
Mem: 6946 508 1841 9 4596
6119
Swap: 4095 179 3916
```
Memory status before the specific testing (_drop_caches_) :
```
total used free shared buff/cache
available
Mem: 6946 499 6126 9 320
6161
Swap: 4095 179 3916
```
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