X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FCpuUtils.py;h=170cbe6b2eb011c72d1d644f628796e3686f9266;hb=7f138bad98908762f9e738c2d7c47ac204acae71;hp=70177f5d9ae1beee8321a9be3c56242800f6e9c5;hpb=ecfe59f83a49e0dda9cead06b81339e4ea545053;p=csit.git

diff --git a/resources/libraries/python/CpuUtils.py b/resources/libraries/python/CpuUtils.py
index 70177f5d9a..170cbe6b2e 100644
--- a/resources/libraries/python/CpuUtils.py
+++ b/resources/libraries/python/CpuUtils.py
@@ -84,6 +84,29 @@ class CpuUtils:
                         [CpuUtils.__str2int(x) for x in line.split(u",")]
                     )
 
+    @staticmethod
+    def worker_count_from_cores_and_smt(phy_cores, smt_used):
+        """Simple conversion utility, needs smt from caller.
+
+        The implementation assumes we pack 1 or 2 workers per core,
+        depending on hyperthreading.
+
+        Some keywords use None to indicate no core/worker limit,
+        so this converts None to None.
+
+        :param phy_cores: How many physical cores to use for workers.
+        :param smt_used: Whether symmetric multithreading is used.
+        :type phy_cores: Optional[int]
+        :type smt_used: bool
+        :returns: How many VPP workers fit into the given number of cores.
+        :rtype: Optional[int]
+        """
+        if phy_cores is None:
+            return None
+        workers_per_core = CpuUtils.NR_OF_THREADS if smt_used else 1
+        workers = phy_cores * workers_per_core
+        return workers
+
     @staticmethod
     def cpu_node_count(node):
         """Return count of numa nodes.