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generate: autodetect number of jobs #844

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generate: autodetect number of jobs #844

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6 changes: 4 additions & 2 deletions cubedash/generate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@
from dataclasses import dataclass
from datetime import timedelta
from functools import partial
from os import sched_getaffinity
from textwrap import dedent

import click
Expand Down Expand Up @@ -301,10 +302,11 @@ def convert(self, value, param, ctx):
"-j",
"--jobs",
type=int,
default=3,
default=min(len(sched_getaffinity(0)), 16),
help=dedent(
"""\
Number of concurrent worker subprocesses to use (default: 3)
Number of concurrent worker subprocesses to use
(default: number of cores or 16, whichever is smaller)

This should match how many io-and-cpu-heavy queries your DB would
like to handle concurrently.
Expand Down