id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
1175854982,I_kwDOBm6k_c5GFh-G,1679,Research: how much overhead does the n=1 time limit have?,9599,closed,0,,3268330,11,2022-03-21T19:27:46Z,2022-03-21T21:55:57Z,2022-03-21T21:55:56Z,OWNER,,"https://github.com/simonw/datasette/blob/1a7750eb29fd15dd2eea3b9f6e33028ce441b143/datasette/utils/__init__.py#L181-L200

```python
@contextmanager
def sqlite_timelimit(conn, ms):
    deadline = time.perf_counter() + (ms / 1000)
    # n is the number of SQLite virtual machine instructions that will be
    # executed between each check. It's hard to know what to pick here.
    # After some experimentation, I've decided to go with 1000 by default and
    # 1 for time limits that are less than 50ms
    n = 1000
    if ms < 50:
        n = 1

    def handler():
        if time.perf_counter() >= deadline:
            return 1

    conn.set_progress_handler(handler, n)
    try:
        yield
    finally:
        conn.set_progress_handler(None, n)
```
How often do I set a time limit of 50 or less? How much slower does it go thanks to this code?",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1679/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed