chore(ci): use cpu_count.sh where possible

Author: mayeul-zama

scripts/c_api_tests.sh

@@ -61,15 +61,10 @@ if [[ "${BUILD_ONLY}" == "1" ]]; then
     exit 0
 fi
 
-nproc_bin=nproc
 
-# macOS detects CPUs differently
-if [[ $(uname) == "Darwin" ]]; then
-    nproc_bin="sysctl -n hw.logicalcpu"
-fi
 
 if [ "${WITH_FEATURE_GPU}" == "ON" ]; then
-    ctest --output-on-failure --test-dir "." --parallel "$(${nproc_bin})" --tests-regex ".*cuda.*"
+    ctest --output-on-failure --test-dir "." --parallel "${CPU_COUNT}" --tests-regex ".*cuda.*"
 else
-    ctest --output-on-failure --test-dir "." --parallel "$(${nproc_bin})" --exclude-regex ".*cuda.*"
+    ctest --output-on-failure --test-dir "." --parallel "${CPU_COUNT}" --exclude-regex ".*cuda.*"
 fi

scripts/shortint-tests.sh

@@ -67,14 +67,7 @@ fi
 CURR_DIR="$(dirname "$0")"
 ARCH_FEATURE="$("${CURR_DIR}/get_arch_feature.sh")"
 
-nproc_bin=nproc
-
-# macOS detects CPUs differently
-if [[ $(uname) == "Darwin" ]]; then
-    nproc_bin="sysctl -n hw.logicalcpu"
-fi
-
-n_threads_small="$(${nproc_bin})"
+n_threads_small="$("${CURR_DIR}"/cpu_count.sh)"
 n_threads_big="${n_threads_small}"
 
 # TODO: automate thread selection by measuring host machine ram and loading the key sizes from the