diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index e842573..d1fdec9 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -12,8 +12,8 @@ on:
 jobs:
   buildTestAnalyze:
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    # The reason to use ubuntu-22.04: https://bugs.launchpad.net/ubuntu/+source/mpich/+bug/2072338
-    runs-on: ubuntu-22.04
+    # A known bug using MPICH ubuntu-24.04: https://bugs.launchpad.net/ubuntu/+source/mpich/+bug/2072338
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:
@@ -41,7 +41,7 @@ jobs:
     - name: Install mpi
       run: |
         sudo apt-get update -yq
-        sudo apt-get install -yq mpich libmpich-dev
+        sudo apt-get install -yq openmpi-bin libopenmpi-dev
 
     - name: ADIOS2 Create Build Environment
       run: /usr/bin/cmake -E make_directory ${{runner.workspace}}/build-adios2
@@ -147,6 +147,7 @@ jobs:
       run: /usr/bin/cmake $GITHUB_WORKSPACE/redev
            -DCMAKE_CXX_COMPILER=mpicxx
            -DCMAKE_C_COMPILER=mpicc
+           -DMPIEXEC_PREFLAGS="--oversubscribe"
            -DCMAKE_BUILD_TYPE=${{matrix.build_type}}
            -DADIOS2_DIR=${{runner.workspace}}/build-adios2/install/lib/cmake/adios2/
            -DADIOS2_HAVE_SST=ON
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e2d2f17..f89dd23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,6 +62,7 @@ include(CTest)
 if(BUILD_TESTING)
   message(STATUS "MPIEXEC_EXECUTABLE: ${MPIEXEC_EXECUTABLE}")
   message(STATUS "MPIEXEC_NUMPROC_FLAG: ${MPIEXEC_NUMPROC_FLAG}")
+  message(STATUS "MPIEXEC_PREFLAGS: ${MPIEXEC_PREFLAGS}")
 
   set(ADIOS2_BPLS_PATH CACHE FILEPATH "Path to the ADIOS2 bpls utility")
   if(ADIOS2_BPLS_PATH AND NOT EXISTS ${ADIOS2_BPLS_PATH})
@@ -91,7 +92,7 @@ if(BUILD_TESTING)
     removeAdiosFiles(${TESTNAME}_cleanup)
     add_test(
       NAME ${TESTNAME}
-      COMMAND ${MPIEXEC_EXECUTABLE} ${MPIEXEC_NUMPROC_FLAG} ${PROCS} ${VALGRIND} ${VALGRIND_ARGS} ${EXE} ${ARGN}
+      COMMAND ${MPIEXEC_EXECUTABLE} ${MPIEXEC_PREFLAGS} ${MPIEXEC_NUMPROC_FLAG} ${PROCS} ${VALGRIND} ${VALGRIND_ARGS} ${EXE} ${ARGN}
     )
   endfunction(mpi_test)
 
@@ -103,6 +104,7 @@ if(BUILD_TESTING)
     add_test(NAME ${DUALTEST_TESTNAME}
       COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/runMultipleMpiJobs.sh
       ${MPIEXEC_EXECUTABLE}
+      ${MPIEXEC_PREFLAGS}
       ${MPIEXEC_NUMPROC_FLAG}
       ${DUALTEST_NAME1} ${DUALTEST_PROCS1} ${DUALTEST_EXE1} "${DUALTEST_ARGS1}"
       ${DUALTEST_NAME2} ${DUALTEST_PROCS2} ${DUALTEST_EXE2} "${DUALTEST_ARGS2}")
@@ -117,6 +119,7 @@ if(BUILD_TESTING)
     add_test(NAME ${TRITEST_TESTNAME}
       COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/runMultipleMpiJobs.sh
       ${MPIEXEC_EXECUTABLE}
+      ${MPIEXEC_PREFLAGS}
       ${MPIEXEC_NUMPROC_FLAG}
       ${TRITEST_NAME1} ${TRITEST_PROCS1} ${TRITEST_EXE1} "${TRITEST_ARGS1}"
       ${TRITEST_NAME2} ${TRITEST_PROCS2} ${TRITEST_EXE2} "${TRITEST_ARGS2}"
diff --git a/runMultipleMpiJobs.sh b/runMultipleMpiJobs.sh
index f7665e0..b064f8d 100755
--- a/runMultipleMpiJobs.sh
+++ b/runMultipleMpiJobs.sh
@@ -1,20 +1,28 @@
 #!/bin/bash -x
-[[ $# != 10 && $# != 14 && $# != 20 ]] && \
-  echo "Usage: <run command> <process flag> <name0> <procs0> <exe0> <args0> ... <name2> <procs2> <exe2> <args2>" && \
+if [[ $# == 10 || $# == 14 || $# == 20 ]]; then
+  # Old format: no preflags
+  runCmd=${1}
+  numProcsFlag=${2}
+  preFlags=""
+  shift 2
+elif [[ $# == 11 || $# == 15 || $# == 21 ]]; then
+  # New format: with preflags
+  runCmd=${1}
+  preFlags=${2}
+  numProcsFlag=${3}
+  shift 3
+else
+  echo "Usage: <run command> <process flag> <preflags> <name0> <procs0> <exe0> <args0> ... <name2> <procs2> <exe2> <args2>" && \
   exit 1
-runCmd=${1}
-numProcsFlag=${2}
-shift 2
+fi
 
-declare -a PIDS
-declare -a LOGS
 run() {
   local name=${1}
   local procs=${2}
   local exe=${3}
   local args=${4}
   IFS=';' read -a argsArray <<< "${args}" #split the cmake list of args
-  ${runCmd} ${numProcsFlag} ${procs} ${exe} ${argsArray[@]} &> ${name}.log &
+  ${runCmd} ${preFlags} ${numProcsFlag} ${procs} ${exe} ${argsArray[@]} &> ${name}.log &
   PIDS+=($!)
   LOGS+=(${name}.log)
 }