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Fixes #166.
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Fixes #624
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Closes #208
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While using xmobar to reproduce/fix a bug in xmonad I noticed that
xmobar doesn't react immediately to the signals to reposition or change
screen.
Apparently none of the Xlib functions called from `repositionWin` flush
the Xlib output buffer (XMoveResizeWindow is known to not flush,
although it's unfortunately not documented), so when compiled with the
threaded runtime that runs XNextEvent in a separate thread, the
reposition is sent to the X server only later when other stuff happens.
With all monitors set to refresh once a minute, this can take a looong
time.
(It's entirely possible this happens even without the threaded runtime,
I didn't test that, sorry.)
The fix is to call XSync at the end of `repositionWin`.
While at it, I spotted that drawInWin calls XSync with discard=true,
which seems like a mistake. We don't want to discard any events, do we?
(In practice, I'd expect the `eventer` thread to read all events even
before the drawing thread manages to discard them, so even if this
discarding XSync ever had any reason to be there, I don't think it does
anything meaningful these days. I may be wrong, though.)
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This reverts commits c6669e26e1 (partially; changelog entry kept),
73e02934d6, 78efa5900a.
These commits were introduced as a workaround for a double UTF-8
encoding bug in xmonad-contrib which itself was meant to be a
fix/workaround for another issue. We have now identified the underlying
issue and fixed it right at the root, so this entire cascade of hacky
(and wrong) workarounds can be safely reverted. Thankfully, none of the
xmonad-contrib hacks made it into a release, so there's no backward
compat to worry about.
Should anyone be interested in the details,
https://github.com/xmonad/xmonad-contrib/commit/63e31ccd8d2865863778207b679f806941bf2788
provides a summary and links to all the related issues and PRs.
Related: https://github.com/jaor/xmobar/pull/482
Related: https://github.com/jaor/xmobar/issues/476
Related: https://github.com/xmonad/xmonad-contrib/commit/63e31ccd8d2865863778207b679f806941bf2788
Related: https://github.com/xmonad/xmonad-contrib/pull/471
Related: https://github.com/xmonad/xmonad-contrib/issues/377
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This makes the Date plugin approximately twice as fast, and makes xmobar
up to about 5–10 % faster if Date is the only active plugin. (If more
expensive plugins like Network or MultiCpu are used, it doesn't make any
measurable difference.)
Micro-benchmark results on my HW:
Date Benchmarks/Date mean 2.833 μs ( +- 16.08 ns )
Date Benchmarks/DateZonedTime mean 5.020 μs ( +- 32.91 ns )
Date Benchmarks/DateWithTimeZone mean 2.827 μs ( +- 20.52 ns )
(DateZonedTime is the original implementation and DateWithTimeZone is
the implementation we had since 0.34 which never refreshes timezone.)
Real-life measurements (done overnight on an idle laptop, with all
measured xmobars running in parallel to ensure comparable conditions;
xmobars configured to only display date and with rate 10 — once per
second):
$ time timeout 6h xmobar .xmobarrc-DateZonedTime
real 360m0,010s
user 0m9,867s
sys 0m4,644s
(9.867 + 4.644) / (360 * 60) = 0.000672
$ time timeout 6h xmobar .xmobarrc-Date
real 360m0,008s
user 0m9,535s
sys 0m4,327s
(9.535 + 4.327) / (360 * 60) = 0.000642
$ time timeout 6h xmobar .xmobarrc-Date-10m
real 360m0,010s
user 0m9,780s
sys 0m4,215s
(9.780 + 4.215) / (360 * 60) = 0.000648
$ time timeout 6h xmobar .xmobarrc-DateWithTimeZone
real 360m0,006s
user 0m9,658s
sys 0m4,166s
(9.658 + 4.166) / (360 * 60) = 0.000640
(.xmobarrc-Date-10m is the proposed implementation, but with timezone
refresh every 10 minutes instead of every 1 minute)
Interpretation of these results:
* refreshing xmobar with just date takes around 650 μs
* that is xmobar with just date uses around 0.065 % of CPU time
* refreshing timezone takes additional cca 30 μs
When we only refresh timezone once a minute, these 30 μs become 0.5 μs
amortized, and that should be acceptable to even the most dedicated
perfectionist :-)
Fixes: a58e32f7c8af ("Revert "Optimize date plugin"")
Fixes: 878db3908060 ("Optimize date plugin")
Co-authored-by: Sibi Prabakaran <sibi@psibi.in>
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