update comments in coverage_fuzz_corpora

maint/coverage_fuzz_corpora

@@ -12,32 +12,22 @@ coverage_dir=$(dirname "$LLVM_PROFILE_FILE")
 TOPDIR=$(realpath "$(dirname "$0")/..")
 cd "$TOPDIR"
 
-# for some reason, compiling with coverage is very slow, especially for curve25519-dalek,
-# and mixing normal runs and coverage runs trash the cache. Here we set an alternative
-# target directory so it's possible to reuse cached artifacts between coverage runs.
+# set an alternative target directory so it's possible to reuse cached artifacts between coverage 
+# runs of coverage and fuzzing.
 export CARGO_TARGET_DIR=${CARGO_TARGET_DIR:-target-coverage}
 
-# remove comments starting with #@ to run in parallel. This makes output very messy, uses a lot more
-# ram and make the load average go crazy, but it's also way faster both to compile (due to 
-# curve25519-dalek compilation being so slow, and it using a single core), and to run because it's
-# essentially monothreaded too.
 for d in ./crates/*/fuzz; do
-    #@{
-        pushd "$(dirname "$d")"
-        crate=$(basename "$(dirname "$d")")
-        mkdir -p "$TOPDIR/target/debug/$crate"
-        mkdir -p "$coverage_dir/$crate"
-        for fuzzer in $(cargo fuzz list); do
-            cargo fuzz coverage "$fuzzer" --sanitizer=none
-
-            # we copy binary and coverage data where with_coverage expect it to be
-            cp "target-coverage/x86_64-unknown-linux-gnu/release/$fuzzer" "$TOPDIR/target/debug/$crate/$fuzzer"
-            mv "fuzz/coverage/$fuzzer/raw" "$coverage_dir/$crate/$fuzzer"
-        done
-        popd
-    #@}&
+    pushd "$(dirname "$d")"
+    crate=$(basename "$(dirname "$d")")
+    mkdir -p "$TOPDIR/target/debug/$crate"
+    mkdir -p "$coverage_dir/$crate"
+    for fuzzer in $(cargo fuzz list); do
+	# disable sanitizer to work in stable. Also make curve25519-dalek compilation much faster
+        cargo fuzz coverage "$fuzzer" --sanitizer=none
+
+        # we copy binary and coverage data where with_coverage expect it to be
+        cp "target-coverage/x86_64-unknown-linux-gnu/release/$fuzzer" "$TOPDIR/target/debug/$crate/$fuzzer"
+        mv "fuzz/coverage/$fuzzer/raw" "$coverage_dir/$crate/$fuzzer"
+    done
+    popd
 done
-
-#@for d in ./crates/*/fuzz; do
-#@    wait
-#@done