Fibers 1.0.0 has a bug in run-fibers in which peer schedulers aren't destroyed -
so if you had 4 cores, 1 would be destroyed when run-fibers returned, but the
other 3 would stay around.  Each scheduler uses 3 file descriptors, so for
machines with many cores, this resource leak adds up quickly - quickly enough
that the test suite can even fail because of it.

See https://github.com/wingo/fibers/issues/36.

This fixes that.  It should be safe to destroy the peer schedulers at the given
point because the threads that could be running them are all either dead or the
current thread.

As of May 21, 2020, this bug still existed in the 1.0.0 (latest) release and in
git master.
--- a/fibers.scm	2020-05-21 18:38:06.890690154 -0500
+++ b/fibers.scm	2020-05-21 18:38:56.395686693 -0500
@@ -137,5 +137,6 @@
              (%run-fibers scheduler hz finished? affinity))
            (lambda ()
              (stop-auxiliary-threads scheduler)))))
+      (for-each destroy-scheduler (scheduler-remote-peers scheduler))
       (destroy-scheduler scheduler)
       (apply values (atomic-box-ref ret))))))

=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>refs</a><a class='active' href='/guix/log/gnu/installer/newt/ethernet.scm'>log</a><a href='/guix/tree/gnu/installer/newt/ethernet.scm?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>tree</a><a href='/guix/commit/gnu/installer/newt/ethernet.scm?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>commit</a><a href='/guix/diff/gnu/installer/newt/ethernet.scm?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/installer/newt/ethernet.scm'>
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<div class='path'>path: <a href='/guix/log/?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>root</a>/<a href='/guix/log/gnu?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>gnu</a>/<a href='/guix/log/gnu/installer?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>installer</a>/<a href='/guix/log/gnu/installer/newt?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>newt</a>/<a href='/guix/log/gnu/installer/newt/ethernet.scm?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30'>ethernet.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/installer/newt/ethernet.scm?id=42d5efc001f0122877cd3b8024ea4b6f7c45ee30&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-07 13:19:25 +0100'>2020-11-07</span></td><td><a href='/guix/commit/gnu/installer/newt/ethernet.scm?id=8338d414b361e4fb961221642c1064e9dc89ba65'>installer: Limit listbox height.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://issues.guix.gnu.org/44428&gt;.

* gnu/installer/newt.scm (init): Print screen size.
* gnu/installer/newt/page.scm (default-listbox-height): New variable.
(run-listbox-selection-page): Use it.
* gnu/installer/newt/wifi.scm (wifi-listbox-height): Ditto.
* gnu/installer/newt/network.scm (run-technology-page): Set the maximum
listbox height to 5.
* gnu/installer/newt/ethernet.scm (run-ethernet-page): Ditto.
* gnu/installer/newt/final.scm (run-config-display-page): Change listbox
height.
* gnu/installer/newt/partition.scm (run-disk-page): Ditto.
* gnu/installer/newt/welcome.scm (display-logo?): New procedure.
(run-menu-page): Use it.
* gnu/installer/steps.scm (%configuration-file-width): Remove it.
</span></span></td><td>Mathieu Othacehe</td></tr>