From 3d92b73a5c67869495137c842cfeaba7296dc437 Mon Sep 17 00:00:00 2001
From: Giulio Eulisse <10544+ktf@users.noreply.github.com>
Date: Tue, 26 May 2026 18:41:42 +0200
Subject: [PATCH] CTP: avoid useless work to count non-zero bits

---
 Common/CCDB/ctpRateFetcher.cxx | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/Common/CCDB/ctpRateFetcher.cxx b/Common/CCDB/ctpRateFetcher.cxx
index 6cf7213f2e7..eb5fcc38f3e 100644
--- a/Common/CCDB/ctpRateFetcher.cxx
+++ b/Common/CCDB/ctpRateFetcher.cxx
@@ -95,9 +95,7 @@ double ctpRateFetcher::pileUpCorrection(double triggerRate)
   if (mLHCIFdata == nullptr) {
     LOG(fatal) << "No filling" << std::endl;
   }
-  auto bfilling = mLHCIFdata->getBunchFilling();
-  std::vector<int> bcs = bfilling.getFilledBCs();
-  double nbc = bcs.size();
+  double nbc = mLHCIFdata->getBunchFilling().getPattern().count();
   double nTriggersPerFilledBC = triggerRate / nbc / constants::lhc::LHCRevFreq;
   double mu = -std::log(1 - nTriggersPerFilledBC);
   return mu * nbc * constants::lhc::LHCRevFreq;