[all-commits] [llvm/llvm-project] c1d6f7: [lit] Add an option to lit which ratelimits progre...

[Nick Begg via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c1d6f7609e16d16864063c6d98feed1a9cdc3270
      https://github.com/llvm/llvm-project/commit/c1d6f7609e16d16864063c6d98feed1a9cdc3270
  Author: Nick Begg <nick at stunttruck.net>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M llvm/docs/CommandGuide/lit.rst
    M llvm/utils/lit/lit/ProgressBar.py
    M llvm/utils/lit/lit/cl_arguments.py
    M llvm/utils/lit/lit/display.py

  Log Message:
  -----------
  [lit] Add an option to lit which ratelimits progressbar output. (#186479)

Add a new option --min-output-interval, which ratelimits updates to the
progress bar.

When running Lit with the full curses progressbar, it updates both the
bar, and the status text below on every test completion. Running
check-llvm on my laptop runs about 44k tests and takes about 260 seconds
for a release build. Or about 171 tests/second on average.

Moreover, when ssh'd to another host, this generates quite a bit of
traffic. Using tcpdump, I measured the traffic for a run of check-llvm
and -clang. With all updates, its about 8.7 megabytes. With a rate limit
of 5 update/sec, this came down to 175 kilobytes. This can be
significant on slow/metered connections.

This patch adds an option to limit lit's output to once per a given
interval. This only affects the progressbar and status message below,
not any log messages above. It also does not affect anything when not
running with the full progressbar (eg outputting to a logfile).

---------

Co-authored-by: Nick Begg <neek78 at users.noreply.github.com>
Co-authored-by: Alexander Richardson <mail at alexrichardson.me>



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