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In freebsd /sys/class/net is absent so we should use sysctl for
obtaining info about stats of network.
For parsing if_data struct we could use a "Foreign.Storable"
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In freebsd /proc/memoryinfo is absent so we should use sysctl for
obtaining info about stats of memory.
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* A queue reader for xmobar using `TQueue a` from `stm`.
This is a flexible and performat solution for sharing
data between arbitrary haskell and xmobar.
* I am not sure if I did the haddocks correctly.
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The automatically derived read instance expects the type to be given in
record syntax; this is not what most users want. In order to simply
specify the type via
Run NotmuchMail "mail" [MailItem "name" "" "tag:unread"] 3000
we have to write our own Read instance.
Related: https://github.com/jaor/xmobar/issues/547
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The existing support for the coretemp kernel driver only works with
Intel CPUs.
This commit extends support for temperature monitoring to AMD CPUs.
k10temp is a kernel driver for monitoring the temperature of AMD
processors. It supports everything from AMD's 10h (Opteron/Athlon)
family of processors to the latest 19h (Zen 3) family.
Reference: https://www.kernel.org/doc/html/latest/hwmon/k10temp.html
The meaning of the various temperatures made available has changed over
the years and only `Tctl` is available on processors prior to the 17h
family.
Labels for these temperatures are present but as Tctl and Tdie do not
contain a number I could not find a way to use these as
`checkedDataRetrieval` expects an integer label.
It is a PCI device and so an address needs to be supplied as part of the
configuration.
Example configuration:
`Run K10Temp "0000:00:18.3" ["--template", "T: <Tdie>C | <Tccd1>C"] 60`
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This plugin checks for new mail, provided that this mail is indexed by
notmuch. As mail that was tagged is moved from the new directory to
cur, the 'Mail' plugin (and its variants) won't work for such mail.
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Introducing the throttling unfortunately has a negative side-effect: it
delays all stdin processing, including EOF detection, which can cause
confusion the previous commit tries to fix.
The only benefit of the throttling is to prevent 100% CPU usage when a
lot of garbage is provided on xmobar stdin. We still don't know where
that garbage comes from in https://github.com/jaor/xmobar/issues/438, or
rather why there's more than a handful of lines of such garbage. @psibi
has since fixed his setup to not produce that garbage, and no one else
ever reported such a problem, so it's probably safe to ignore it for
now.
Should anyone ever encounter that again, feel free to ping me, even in
the middle of the night, to help debug this.
Fixes: 7759df11f746 ("StdinReader: Improve exception handling")
Fixes: b7a3d6745817 ("Avoid busy looping by not catching all exceptions")
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This corrects a misleading comment "EOF check is necessary for certain
systems" which was added without complete understanding of the root
cause of #442. That issue was in fact caused by old xmobars not being
terminated on early EOF, and is thus necessary on _all_ systems that
rely on EOF to terminate old xmobar before starting a new one. (To
trigger the bug, one additionally needs to close the xmobar pipe before
sending any input to it, which is unusual, but incorrectly configured
xmonad might trigger that.)
Furthermore, this fixes another execution path that could lead to xmobar
not being terminated on EOF:
`echo -e '\xff' | xmobar -c '[Run StdinReader]' -t '%StdinReader%'`
would terminate the StdinReader thread upon catching the "invalid
argument (invalid byte sequence)" so there'd be no thread to detect the
subsequent EOF and xmobar would get stuck.
Additionally, I believe that terminating either the thread or the entire
xmobar upon receiving a single miscoded byte isn't desirable, as this
might be an intermittent issue and another input line can be perfectly
okay. Therefore I suggest that the original issue @psibi was trying to
fix by b7a3d6745817 is worked around by introducing a throttling delay
instead of terminating the thread, as I assume that exceptions other
than async and EOF are recoverable.
Fixes: b7a3d6745817 ("Avoid busy looping by not catching all exceptions")
Fixes: 68ac4d3ae6f3 ("Update stderr and the bar on receiving exception")
Fixes: ed0663aac942 ("Add EOF check before getLine operation from stdin")
Fixes: https://github.com/jaor/xmobar/issues/442
Related: https://github.com/jaor/xmobar/pull/439
Related: https://github.com/jaor/xmobar/pull/448
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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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This reverts commit 878db39080607ba476ba8d8f547ad28259efb6a9. That
commit optimized the date plugin by avoiding calling getTimeZone on each
execution, instead calling it just once upon startup and reusing that
zone. As a result, the time zone will not be updated dynamically, e.g.
when shifting in or out of daylight savings time.
I noticed this after my local time zone had shifted from EDT to EST. My
xmobar showed 4:30 when the local time was in fact 3:30 (and running
date on the command line confirmed that my system clock was actually
aware of this shift). I had to restart xmobar in order to pick up the
new time zone.
I repro'd the unexpected behavior by temporarily disabling my system's
time syncing, setting the time to 30 seconds before the zone shift,
running date to confirm I'd set the correct time, restarting xmobar, and
observing.
sudo systemctl stop systemd-timesyncd.service
date --set="01:59:30"
date
I observed my xmobar clock go from 1:59 to 2:00, rather than from 1:59
to 1:00 as expected.
Following the same steps, I was able to verify that this commit fixes
the issue.
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spotifyd is funky that way
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Both functions had a default parameter for use in some error cases. Now each accepts only one parameter (a
PerChannel), and return Nothing on an error.
The definition of 'channel' confused me, so I simplified it. Hopefully it's now
more clear that it just applies 'toInteger' to the 'IO (Maybe
CLong)' that 'channel'' returns.
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As documented in the http-client library, calling newManager is an
expensive operation:
```
Creating a new Manager is a relatively expensive operation, you are
advised to share a single Manager between requests instead.
```
But inspite of the haddocks in xmobar claiming that once 'Manager' is
created, it will be used throughout the monitor is not true. Because for
every call of `startWeather` a new manager is being created.
Also I removed the option in WeatherOpts because even if it is false,
it will be ultimately created in `getData` function. Also without
using a manager - the plugin won't really work. So, I don't think
there is any reason for this option to exist.
I have introduced a new dependency http-client-tls to use the shared
global manager so that we reuse the same manager every time. This
simplifies a lot of code. Note that this is not really a new
dependency because http-conduit already depends on it transitively.
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We avoid calling getTimeZone for each of the time the date has to be
updated. Instead, it's computed once at the start and re-used for each
invocation.
Looking at the implementation of 'getTimeZone', we can see that it's
very expensive:
https://www.stackage.org/haddock/lts-15.15/time-1.9.3/src/Data-Time-LocalTime-Internal-TimeZone.html#getTimeZone
It calls a C FFI each time to get the time
zone (getTimeZoneCTime). This is something which we can avoid and the
MR implements that.
I have been using my xmobar with this patch and the result has been
quite good. My xmobar CPU usage has used to hit 3~7%
intermittently. With this MR, It hits only 0.7% intermittently which
is nice. :-)
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Fixes https://github.com/jaor/xmobar/issues/442
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