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No migrations occur. > NUMAB2 - Existing hot page promotion for the base case and > use of hint faults as source in the pghot case. > > Pghot by default promotes after two accesses but for NUMAB2 source, > promotion is done after one access to match the base behaviour. > (/sys/kernel/debug/pghot/freq_threshold=1) > These numbers are from scenario where demotion is present: ============================================= Over-committed scenario, promotion + demotion ============================================= Command: mpirun -n 128 --bind-to core --map-by core /home/bharata/benchmarks/graph500/src/graph500_reference_bfs 30 16 The scale factor of 30 results in around 400GB of memory being provisioned resulting in the data spilling over to CXL node. No explicit migration of data is done in this case unlike the previous case. ===================================================================================== Base Base pghot-default pghot-precise NUMAB0 NUMAB2 NUMAB2 NUMAB2 ===================================================================================== harmonic_mean_TEPS 9.28713e+08 7.90431e+08 7.32193e+08 7.81051e+08 mean_time 18.4984 21.7346 23.4634 21.9956 median_TEPS 9.25707e+08 7.86684e+08 7.27053e+08 7.82823e+08 max_TEPS 9.57632e+08 8.4758e+08 8.22172e+08 7.9889e+08 pgpromote_success 0 22846743 22807167 25994988 pgpromote_candidate 0 24628924 29436044 27029173 pgpromote_candidate_nrl 0 140921 220 38387 pgdemote_kswapd 0 41523110 45121134 50042594 numa_pte_updates 0 121904763 71503891 68779424 numa_hint_faults 0 81708126 29583391 27176332 ===================================================================================== - In the base case, the benchmark suffers when promotion and demotion are enabled (NUMAB2 case). - Same behaviour is seen with both modes of pghot. - Though the overall benchmark numbers remain more or less same with base and pghot NUMAB2 cases, the number of pte updates and hint faults are seen to spike up during some runs. Yet to understand the exact reason for this.