squeeze

commit 8bd01a7aa0395916aef93b0e7a2fb5b5728c4df2
parent 357792bce2ad35bad22ac5e9d3ea1ae73ba4270d
Author: St John Karp <contact@stjo.hn>
Date:   Mon, 30 Aug 2021 02:15:39 -0400

Use a portable way to get the number of processors

`nproc` isn't a POSIX tool, but we can use fallbacks to get the
number of processors on different systems.

Diffstat:
M
squeeze.sh
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/squeeze.sh b/squeeze.sh
@@ -12,7 +12,11 @@ SOURCE_PATH="$SITE_PATH/source"
 # A space-separated list of all the process IDs we've started.
 proc_ids=""
 # Max number of processes to run at once.
-MAX_PROCESSES="$(nproc)"
+# There is no way to do `nproc` with only POSIX tools,
+# so the best way to make this portable is with fallbacks.
+MAX_PROCESSES="$(nproc 2>/dev/null ||
+	sysctl -n hw.ncpu 2>/dev/null ||
+	getconf _NPROCESSORS_ONLN 2>/dev/null)"
 
 # Copy everything that's not Markdown.
 # This will also create the folder structure for the destination Markdown files.