Use real copies instead of hardlinks and increase parallel builds to 3

Hardlinked source copies caused deterministic Cray compiler segfaults
in optcg during IPA when compiling m_phase_change.fpp.f90 with OpenACC.
Switching to real copies avoids inode sharing on Lustre that triggers the
compiler bug. Also bump MAX_PARALLEL from 2 to 3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/scripts/run_frontier_all_benchmarks.sh

@@ -42,14 +42,14 @@ for cfg in "${configs[@]}"; do
     dir="${version}-${cluster}-${device}-${interface}"
     echo "Creating source copy: $dir from $version/"
     rm -rf "$dir"
-    cp -al "$version" "$dir" 2>/dev/null || cp -r "$version" "$dir"
+    cp -r "$version" "$dir"
 done
 
 # --- Phase 2: Build all configs on login node in parallel ---
 # Avoid setuptools_scm git conflicts in hardlink copies (shared .git/index)
 export SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0
 
-MAX_PARALLEL=2
+MAX_PARALLEL=3
 
 echo ""
 echo "=========================================="

.github/scripts/run_frontier_all_tests.sh

@@ -47,14 +47,14 @@ for cfg in "${configs[@]}"; do
     dir="test-${cluster}-${device}-${interface}"
     echo "Creating source copy: $dir"
     rm -rf "$dir"
-    rsync -a --link-dest="$(pwd)" $excludes ./ "$dir/"
+    rsync -a $excludes ./ "$dir/"
 done
 
 # --- Phase 2: Build all configs on login node in parallel ---
 # Avoid setuptools_scm git conflicts in hardlink copies (shared .git/index)
 export SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0
 
-MAX_PARALLEL=2
+MAX_PARALLEL=3
 
 echo ""
 echo "=========================================="