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-rw-r--r--chapter08/automake.xml9
1 files 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>