diff --git a/tests/rt.conf b/tests/rt.conf
index e4777861c9..c7e9f8edbc 100644
--- a/tests/rt.conf
+++ b/tests/rt.conf
@@ -103,7 +103,9 @@ RUN     | control_wam
 # DEBUG ATM tests                                                                                                                                                                 #
 ###################################################################################################################################################################################
 
-COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_GFS_v16,FV3_GFS_v16_csawmg,FV3_GFS_v16_flake,FV3_GFS_v16_ugwpv1,FV3_GFS_v16_ras,FV3_GFS_v16_noahmp,FV3_GFS_v16_thompson,FV3_GFS_v15_thompson_mynn,FV3_GFS_v17_p8  -D32BIT=ON | | fv3 |
+# Keep old split jobs on outgoing wcoss_dell_p3 and wcoss_cray (compilation otherwise takes forever and eventually dies with the usual "catastrophic error ...")
+COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_GFS_v16,FV3_GFS_v16_csawmg,FV3_GFS_v16_flake,FV3_GFS_v16_ugwpv1,FV3_GFS_v16_ras,FV3_GFS_v16_noahmp,FV3_GFS_v16_thompson,FV3_GFS_v15_thompson_mynn,FV3_GFS_v17_p8  -D32BIT=ON | + wcoss_dell_p3 wcoss_cray | fv3 |
+COMPILE | -DAPP=ATM -DDEBUG=ON -D32BIT=ON                                                                                         | - wcoss_dell_p3 wcoss_cray              | fv3 |
 
 RUN     | control_debug                                                                                                           |                                         | fv3 |
 RUN     | control_2threads_debug                                                                                                  | - wcoss_cray                            |     |
@@ -124,7 +126,7 @@ RUN     | control_thompson_progcld_thompson_debug
 
 RUN     | regional_debug                                                                                                          |                                         | fv3 |
 
-COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_RAP,FV3_RAP_cires_ugwp,FV3_RAP_unified_ugwp,FV3_RAP_flake -D32BIT=ON             |                                         | fv3 |
+COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_RAP,FV3_RAP_cires_ugwp,FV3_RAP_unified_ugwp,FV3_RAP_flake -D32BIT=ON             | + wcoss_dell_p3 wcoss_cray              | fv3 |
 
 RUN     | rap_control_debug                                                                                                       |                                         | fv3 |
 RUN     | rap_unified_drag_suite_debug                                                                                            |                                         |     |
@@ -135,7 +137,7 @@ RUN     | rap_lndp_debug
 RUN     | rap_flake_debug                                                                                                         |                                         | fv3 |
 RUN     | rap_progcld_thompson_debug                                                                                              |                                         | fv3 |
 
-COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_RAP_noah,FV3_RAP_RRTMGP,FV3_RAP_sfcdiff,FV3_RAP_noah_sfcdiff_cires_ugwp,FV3_RRFS_v1beta -D32BIT=ON |                       | fv3 |
+COMPILE | -DAPP=ATM -DDEBUG=ON -DCCPP_SUITES=FV3_RAP_noah,FV3_RAP_RRTMGP,FV3_RAP_sfcdiff,FV3_RAP_noah_sfcdiff_cires_ugwp,FV3_RRFS_v1beta -D32BIT=ON | + wcoss_dell_p3 wcoss_cray | fv3 |
 RUN     | rap_noah_debug                                                                                                          |                                         | fv3 |
 RUN     | rap_rrtmgp_debug                                                                                                        |                                         | fv3 |
 RUN     | rap_sfcdiff_debug                                                                                                       |                                         | fv3 |