Useful for discovering bugs that depend on a specific thread count.
Uses a simple PRNG copied from random() from libavutil/eval.c
Use like THREADS=randomX for a random thread count from 1 to X, with
X=16 when not specified.
---
doc/fate.texi | 5 +++++
tests/fate-run.sh | 9 +++++++++
2 files changed, 14 insertions(+)
diff --git a/doc/fate.texi b/doc/fate.texi
index 8450856015..13aea7a21f 100644
--- a/doc/fate.texi
+++ b/doc/fate.texi
@@ -223,6 +223,11 @@ meaning only while running the regression tests.
Specify how many threads to use while running regression tests, it is
quite useful to detect thread-related regressions.
+This variable may be set to the string "random", optionally followed by a
+number, like "random99", This will cause each test to use a random number of
+threads. If a number is specified, it is used as a maximum number of threads,
+otherwise 16 is the maximum.
+
@item THREAD_TYPE
Specify which threading strategy test, either @samp{slice} or @samp{frame},
by default @samp{slice+frame}
diff --git a/tests/fate-run.sh b/tests/fate-run.sh
index e12279e4cf..55c579f84e 100755
--- a/tests/fate-run.sh
+++ b/tests/fate-run.sh
@@ -33,6 +33,15 @@ errfile="${outdir}/${test}.err"
cmpfile="${outdir}/${test}.diff"
repfile="${outdir}/${test}.rep"
+case $threads in
+ random*)
+ threads_max=${threads#random}
+ [ -z "$threads_max" ] && threads_max=16
+ threads="mod(time(0)*1664525+1013904223,$threads_max)+1"
+ ;;
+esac
+
+
target_path(){
test ${1} = ${1#/} && p=${target_path}/
echo ${p}${1}
--
2.40.1
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