From efb438cd37ca5b2ea86437a1ee098ba665a9eb55 Mon Sep 17 00:00:00 2001
From: Chris Hennick <4961925+Pr0methean@users.noreply.github.com>
Date: Fri, 7 Jun 2024 22:55:25 +0000
Subject: [PATCH] Use fewer threads for fuzz-until-converged when
 Hyper-Threading is enabled

---
 fuzz-until-converged.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fuzz-until-converged.sh b/fuzz-until-converged.sh
index 02e612ea..a6822eac 100755
--- a/fuzz-until-converged.sh
+++ b/fuzz-until-converged.sh
@@ -1,12 +1,13 @@
 #!/bin/bash
 rm -r "fuzz/corpus/fuzz_$1_old"
+ncpus=$(nproc || getconf NPROCESSORS_ONLN)
+ncpus=$(( ncpus / ( 1 + $(cat /sys/devices/system/cpu/smt/active))))
 MAX_ITERS_WITHOUT_IMPROVEMENT=3
 iters_without_improvement=0
 while [[ $iters_without_improvement -lt $MAX_ITERS_WITHOUT_IMPROVEMENT ]]; do
   cp -r "fuzz/corpus/fuzz_$1" "fuzz/corpus/fuzz_$1_old"
   cargo fuzz run --all-features "fuzz_$1" "fuzz/corpus/fuzz_$1" -- \
-    -dict=fuzz/fuzz.dict -max_len="$2" -rss_limit_mb=8192 \
-    -fork="$(nproc || getconf NPROCESSORS_ONLN)" -runs=15000000 \
+    -dict=fuzz/fuzz.dict -max_len="$2" -fork="$ncpus" \
     -max_total_time=900
   ./recursive-fuzz-cmin.sh "$1" "$2"
   if diff "fuzz/corpus/fuzz_$1" "fuzz/corpus/fuzz_$1_old"; then