This test times how long it takes to encode a sample WAV file to FLAC format five times.
The test is single-threaded and all testing was done pinned to core 1.
Metrics (Intel) - phoronix/encode-flacsh - pid 8034 On_CPU 0.112 On_Core 0.897 IPC 2.432 Retire 0.638 (63.8%) FrontEnd 0.051 (5.1%) Spec 0.037 (3.7%) Backend 0.273 (27.3%) Elapsed 11.06 Procs 7 Maxrss 10K Minflt 1296 Majflt 0 Inblock 0 Oublock 563328 Msgsnd 0 Msgrcv 0 Nsignals 0 Nvcsw 159 (5.9%) Nivcsw 2530 Utime 9.638954 Stime 0.276433 Start 233991.51 Finish 234002.57
Five separate processes are run as well as I/O, resulting in an On_Core of ~90%. Otherwise the IPC for this program is high with the primary limiter as backend stalls.
Metrics (AMD) - phoronix/encode-flacsh - pid 12465 On_CPU 0.057 On_Core 0.910 IPC 2.494 FrontCyc 0.045 (4.5%) BackCyc 0.131 (13.1%) Elapsed 11.10 Procs 7 Maxrss 10K Minflt 1305 Majflt 0 Inblock 0 Oublock 563328 Msgsnd 0 Msgrcv 0 Nsignals 0 Nvcsw 155 (4.3%) Nivcsw 3446 Utime 9.765776 Stime 0.339269 Start 244092.10 Finish 244103.20
IPC for AMD is just slightly higher than Intel.
Process Tree - phoronix/encode-flacProcess Tree
8034) sh elapsed=11.06 start=2.67 finish=13.73
8035) encode-flac elapsed=11.06 start=2.67 finish=13.73
8036) flac elapsed=1.97 start=2.67 finish=4.64
8037) flac elapsed=2.23 start=4.64 finish=6.87
8038) flac elapsed=2.30 start=6.87 finish=9.17
8039) flac elapsed=2.28 start=9.17 finish=11.45
8042) flac elapsed=2.28 start=11.45 finish=13.73
The process tree is five short processes run one after another.
Scheduled on core is ~90% with gaps between processes and some system time for I/O.
IPC is both constant and relatively high.
Primary limiter is backend stalls.
Next steps: Dig next level on the backend stalls.