diff --git a/src/cpu-utils.h b/src/cpu-utils.h
index 42fd084..2071af5 100644
--- a/src/cpu-utils.h
+++ b/src/cpu-utils.h
@@ -33,43 +33,6 @@ static unsigned int get_nprocs_conf()
 }
 #endif
 
-/**
- * @brief Get the available number of logical processor.
- *
- * Detect the logical processor number with `get_nproc_conf()`
- * or get the number with the environment variable **DCURL_NUM_CPU**.
- * @return The available number of logical processor.
- * If the environment variable **DCURL_NUM_CPU** is not set, return the
- * **maximum logical processor number - 1**.
- */
-static inline int get_avail_logic_nprocs()
-{
-    size_t nproc = get_nprocs_conf() - 1;
-
-    do {
-        char *env_ncpu = getenv("DCURL_NUM_CPU");
-        if (!env_ncpu) {
-            break;
-        }
-
-        char *end;
-        signed int num = strtol(env_ncpu, &end, 10);
-        if (end == env_ncpu) {
-            /* if no characters were converted these pointers are equal */
-            break;
-        }
-        if (errno == ERANGE || num > INT_MAX || num < 0) {
-            /* because strtol produces a long, check for overflow */
-            break;
-        }
-        nproc = num;
-    } while (0);
-
-    if (!nproc)
-        nproc = 1;
-    return nproc;
-}
-
 /**
  * @brief Get the thread number per physical processor.
  *
@@ -128,3 +91,50 @@ static inline int get_nthds_per_physic_proc()
         return -1;
     return nthread;
 }
+
+/**
+ * @brief Get the available number of physical processor.
+ *
+ * Detect the physical processor number with `get_nproc_conf()`
+ * or get the number with the environment variable **DCURL_NUM_CPU**.
+ * @return The available number of physical processor.
+ * @retval DCURL_NUM_CPU Return it if the environment variable
+ * **DCURL_NUM_CPU** is set.
+ * @retval Maximum_physical_processor_number-1 Return it if the environment
+ * variable **DCURL_NUM_CPU** is not set. The minimum value would be 1.
+ * @retval -1 Unexpected error.
+ */
+static inline int get_avail_physic_nprocs()
+{
+    int nthd;
+    size_t nproc;
+
+    nthd = get_nthds_per_physic_proc();
+    if (nthd <= 0)
+        return -1;
+    else
+        nproc = (get_nprocs_conf() / nthd) - 1;
+
+    do {
+        char *env_ncpu = getenv("DCURL_NUM_CPU");
+        if (!env_ncpu) {
+            break;
+        }
+
+        char *end;
+        signed int num = strtol(env_ncpu, &end, 10);
+        if (end == env_ncpu) {
+            /* if no characters were converted these pointers are equal */
+            break;
+        }
+        if (errno == ERANGE || num > INT_MAX || num < 0) {
+            /* because strtol produces a long, check for overflow */
+            break;
+        }
+        nproc = num;
+    } while (0);
+
+    if (!nproc)
+        nproc = 1;
+    return nproc;
+}
diff --git a/src/pow_avx.c b/src/pow_avx.c
index a1c8332..6ad8d9c 100644
--- a/src/pow_avx.c
+++ b/src/pow_avx.c
@@ -574,7 +574,7 @@ static bool PowAVX(void *pow_ctx)
 static bool PoWAVX_Context_Initialize(ImplContext *impl_ctx)
 {
     impl_ctx->num_max_thread = get_nthds_per_physic_proc();
-    int nproc = get_avail_logic_nprocs() / impl_ctx->num_max_thread;
+    int nproc = get_avail_physic_nprocs();
     if (impl_ctx->num_max_thread <= 0 || nproc <= 0)
         return false;
 
diff --git a/src/pow_c.c b/src/pow_c.c
index f0d2230..392f3ac 100644
--- a/src/pow_c.c
+++ b/src/pow_c.c
@@ -338,7 +338,7 @@ bool PowC(void *pow_ctx)
 static bool PoWC_Context_Initialize(ImplContext *impl_ctx)
 {
     impl_ctx->num_max_thread = get_nthds_per_physic_proc();
-    int nproc = get_avail_logic_nprocs() / impl_ctx->num_max_thread;
+    int nproc = get_avail_physic_nprocs();
     if (impl_ctx->num_max_thread <= 0 || nproc <= 0)
         return false;
 
diff --git a/src/pow_sse.c b/src/pow_sse.c
index 6556a44..da5f4f5 100644
--- a/src/pow_sse.c
+++ b/src/pow_sse.c
@@ -356,7 +356,7 @@ static bool PowSSE(void *pow_ctx)
 static bool PoWSSE_Context_Initialize(ImplContext *impl_ctx)
 {
     impl_ctx->num_max_thread = get_nthds_per_physic_proc();
-    int nproc = get_avail_logic_nprocs() / impl_ctx->num_max_thread;
+    int nproc = get_avail_physic_nprocs();
     if (impl_ctx->num_max_thread <= 0 || nproc <= 0)
         return false;