From c17a77452a184025e6577e8cdf1315905acaa6bf Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@xry111.site>
Date: Mon, 11 Sep 2023 16:07:26 +0800
Subject: automake: Do not use only 4 cores for testing if we have more

---
 chapter08/automake.xml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/chapter08/automake.xml b/chapter08/automake.xml
index 4fc1bd277..5d7541049 100644
--- a/chapter08/automake.xml
+++ b/chapter08/automake.xml
@@ -53,11 +53,14 @@
 
 <screen><userinput remap="make">make</userinput></screen>
 
-    <para> Using the -j4 make option speeds up the tests, even on systems with
-    only one processor, due to internal delays in individual tests.  To test
+    <para>Using four parallel jobs speeds up the tests, even on systems with
+    less logical cores, due to internal delays in individual tests.  To test
     the results, issue:</para>
 
-<screen><userinput remap="test">make -j4 check</userinput></screen>
+<screen><userinput remap="test">make <replaceable>-j$(($(nproc)&gt;4?$(nproc):4))</replaceable> check</userinput></screen>
+
+    <para>Replace <replaceable>$((...))</replaceable> with the number of
+    logical cores you want to use if you don't want to use all.</para>
 
     <para>The test t/subobj.sh is known to fail.</para>
 
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