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Fix flaky GC test (#1619)

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Ivan Milinović 2024-01-10 00:11:29 +01:00 committed by GitHub
parent 4bb9238679
commit 1ba2f4e619
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1 changed files with 10 additions and 10 deletions
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tests/e2e/garbage_collection/gc_periodic.py
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@ -38,21 +38,21 @@ def get_memory(cursor):
def test_gc_periodic(connection):
"""
This test checks that periodic gc works.
It does so by checking that the allocated memory is lowered by at least 1/4 of the memory allocated by creating nodes.
If we choose a number a high number the test will become flaky because the memory only gets fully cleared after a while
due to jemalloc holding some memory for a while. If we'd wait for jemalloc to fully release the memory the test would take too long.
"""
cursor = connection.cursor()
memory_pre_creation = get_memory(cursor)
execute_and_fetch_all(cursor, "UNWIND range(1, 1000) AS index CREATE (:Node);")
execute_and_fetch_all(cursor, "UNWIND range(1, 100000) AS index CREATE (:Node);")
memory_after_creation = get_memory(cursor)
time.sleep(5)
memory_after_gc = get_memory(cursor)
execute_and_fetch_all(cursor, "MATCH (n) DETACH DELETE n;")
assert memory_after_gc < memory_pre_creation + (memory_after_creation - memory_pre_creation) / 4 * 3
for i in range(5):
time.sleep(2)
memory_after_gc = get_memory(cursor)
if memory_after_gc < memory_pre_creation + (memory_after_creation - memory_pre_creation) / 4:
return
raise MemoryError("GC didn't clean the memory after 10 seconds")
if __name__ == "__main__":