html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app https://github.com/simonw/datasette/issues/846#issuecomment-643685669,https://api.github.com/repos/simonw/datasette/issues/846,643685669,MDEyOklzc3VlQ29tbWVudDY0MzY4NTY2OQ==,9599,2020-06-13T22:24:22Z,2020-06-13T22:24:22Z,OWNER,"I tried this experiment: ```python import sqlite3, psutil def show_things(): conn = sqlite3.connect(""fixtures.db"") tables = [r[0] for r in conn.execute(""select * from sqlite_master"").fetchall()] return tables print(psutil.Process().open_files()) print(show_things()) print(psutil.Process().open_files()) ``` To see if the connection would be automatically released when the `conn` variable was garbage collected at the end of the function... and it was correctly released - the two calls to `open_files()` showed that the file did not remain open. Likewise: ``` In [11]: conn = sqlite3.connect(""fixtures.db"") In [12]: psutil.Process().open_files() Out[12]: [popenfile(path='/Users/simon/.ipython/profile_default/history.sqlite', fd=4), popenfile(path='/Users/simon/.ipython/profile_default/history.sqlite', fd=5), popenfile(path='/Users/simon/Dropbox/Development/datasette/fixtures.db', fd=12)] In [13]: del conn In [14]: psutil.Process().open_files() Out[14]: [popenfile(path='/Users/simon/.ipython/profile_default/history.sqlite', fd=4), popenfile(path='/Users/simon/.ipython/profile_default/history.sqlite', fd=5)] ``` So presumably there's something about the way my pytest fixtures work that's causing the many different `Datasette()` instances and their underlying SQLite connections that I create not to be cleaned up later.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",638241779, https://github.com/simonw/datasette/issues/846#issuecomment-643685333,https://api.github.com/repos/simonw/datasette/issues/846,643685333,MDEyOklzc3VlQ29tbWVudDY0MzY4NTMzMw==,9599,2020-06-13T22:19:38Z,2020-06-13T22:19:38Z,OWNER,That's 91 open files but only 29 unique filenames.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",638241779, https://github.com/simonw/datasette/issues/846#issuecomment-643685207,https://api.github.com/repos/simonw/datasette/issues/846,643685207,MDEyOklzc3VlQ29tbWVudDY0MzY4NTIwNw==,9599,2020-06-13T22:18:01Z,2020-06-13T22:18:01Z,OWNER,"This shows currently open files (after `pip install psutil`): ``` import psutil psutil.Process().open_files() ``` I ran it inside `pytest -x --pdb` and got this: ``` > /Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.7/site-packages/jinja2/utils.py(154)open_if_exists() -> return open(filename, mode) (Pdb) import psutil (Pdb) psutil.Process().open_files() popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp9uhx5d8x/fixtures.db', fd=10), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyfw44ica/fixtures.dot.db', fd=11), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyrg6g48b/fixtures.db', fd=12), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=13), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=14), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=15), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=16), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=17), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=18), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp33kkg62s/fixtures.db', fd=19), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpng4lg84_/fixtures.db', fd=20), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp9uhx5d8x/fixtures.db', fd=21), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp9uhx5d8x/fixtures.db', fd=22), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp9uhx5d8x/fixtures.db', fd=23), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmph11oalw_/fixtures.db', fd=24), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyfw44ica/fixtures.dot.db', fd=25), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyfw44ica/fixtures.dot.db', fd=26), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyfw44ica/fixtures.dot.db', fd=27), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpiorb2bo9/fixtures.db', fd=28), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyrg6g48b/fixtures.db', fd=29), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyrg6g48b/fixtures.db', fd=30), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpyrg6g48b/fixtures.db', fd=31), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmprvyj5udv/fixtures.db', fd=32), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpng4lg84_/fixtures.db', fd=33), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpng4lg84_/fixtures.db', fd=34), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpng4lg84_/fixtures.db', fd=35), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpb_l6gmq0/fixtures.db', fd=36), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmph11oalw_/extra database.db', fd=40), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/fixtures.db', fd=41), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpiorb2bo9/fixtures.db', fd=42), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpiorb2bo9/fixtures.db', fd=43), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpiorb2bo9/fixtures.db', fd=44), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmph11oalw_/fixtures.db', fd=45), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmph11oalw_/fixtures.db', fd=52), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/fixtures.db', fd=53), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmprvyj5udv/fixtures.db', fd=54), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmprvyj5udv/fixtures.db', fd=55), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmprvyj5udv/fixtures.db', fd=56), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpoveuwqn6/fixtures.db', fd=57), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpb_l6gmq0/fixtures.db', fd=61), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpb_l6gmq0/fixtures.db', fd=62), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpb_l6gmq0/fixtures.db', fd=63), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp_j4h9mrn/fixtures.db', fd=64), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/fixtures.db', fd=65), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/fixtures.db', fd=66), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/extra database.db', fd=67), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/extra database.db', fd=68), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/fixtures.db', fd=69), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpf0py4thp/extra database.db', fd=70) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpub3eodj1/fixtures.db', fd=71) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/fixtures.db', fd=72) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo.db', fd=73) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo.db', fd=74) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/fixtures.db', fd=75) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/fixtures.db', fd=76) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo.db', fd=77) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo-bar.db', fd=78) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo-bar.db', fd=79) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpwgcnmg4b/foo-bar.db', fd=80) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/pytest-of-simon/pytest-4/config-dir0/immutable.db', fd=81), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpoveuwqn6/fixtures.db', fd=82), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpoveuwqn6/fixtures.db', fd=83), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpoveuwqn6/fixtures.db', fd=84), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp44w5d5wo/fixtures.db', fd=85), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp_j4h9mrn/fixtures.db', fd=86), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp_j4h9mrn/fixtures.db', fd=87), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp_j4h9mrn/fixtures.db', fd=88), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpvu7h14uy/fixtures.db', fd=89), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/pytest-of-simon/pytest-4/config-dir0/demo.db', fd=119), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/pytest-of-simon/pytest-4/config-dir0/demo.db', fd=120), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/pytest-of-simon/pytest-4/config-dir0/demo.db', fd=121), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp0xcnrjag/fixtures.db', fd=122), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpub3eodj1/fixtures.db', fd=123), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpub3eodj1/fixtures.db', fd=124), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpub3eodj1/fixtures.db', fd=125), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpfz8go8rk/fixtures.db', fd=126), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp44w5d5wo/fixtures.db', fd=127), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp44w5d5wo/fixtures.db', fd=128), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp44w5d5wo/fixtures.db', fd=129), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp5j3k1ep_/fixtures.db', fd=130) popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpvu7h14uy/fixtures.db', fd=131), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpvu7h14uy/fixtures.db', fd=132), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpvo3cobk9/fixtures.db', fd=133), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp2t9txyir/fixtures.db', fd=134), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpfz8go8rk/fixtures.db', fd=135), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmpfz8go8rk/fixtures.db', fd=136), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp7h3skv8b/fixtures.db', fd=137), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp5j3k1ep_/fixtures.db', fd=138), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp5j3k1ep_/fixtures.db', fd=139), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp5j3k1ep_/fixtures.db', fd=140), popenfile(path='/private/var/folders/wr/hn3206rs1yzgq3r49bz8nvnh0000gn/T/tmp5j3k1ep_/extra database.db', fd=141), ``` So yeah, that's too many open files! 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