Hi, I am playing with FX scheduling policy with different time-quanta on SPECOMP multithreaded programs. I am using "prstat -Lm" to analyze the effect of different time-quanta on the performance of the programs.
Most of the programs experience "system traps" (TRP) with FX 10ms time-quantum. However, there are no traps with FX 100ms, 200ms, and higher time-quantum values. I understand that based on the time-quantum value, there will be change in other prstat fields such as context-switches, lock contention etc., but I don't understand why I am getting "traps" only when I used FX "10ms" time-quantum. My machine is a multi-core AMD Opteron running Solaris 10. Please see the output of prstat below (for FX 200ms, 100ms, and 10ms). I am also providing stack traces of FX with 10ms run. Please clarify my confusion. Many many thanks. FX with 200ms ------------- PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 23062 user 77 0.1 0.0 0.0 0.0 3.1 0.0 20 119 88 1K 0 myprogram/1 23062 user 73 0.0 0.0 0.0 0.0 9.6 0.0 18 185 351 206 0 myprogram/11 23062 user 72 0.0 0.0 0.0 0.0 9.3 0.0 19 185 72 204 0 myprogram/8 23062 user 71 0.0 0.0 0.0 0.0 10 0.0 19 178 83 194 0 myprogram/17 ..... ..... 23062 user 69 0.0 0.0 0.0 0.0 9.5 0.0 21 180 85 196 0 myprogram/18 ... ... 23062 user 69 0.0 0.0 0.0 0.0 9.8 0.0 21 193 84 206 0 myprogram/31 FX with 100ms ------------- PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 23089 user 76 0.1 0.0 0.0 0.0 2.0 0.0 22 138 164 2K 0 myprogram/1 23089 user 70 0.0 0.0 0.0 0.0 10 0.0 20 211 157 227 0 myprogram/10 23089 user 70 0.0 0.0 0.0 0.0 10 0.0 20 220 435 238 0 myprogram/7 .... .... 23089 user 69 0.0 0.0 0.0 0.0 10 0.0 20 214 153 228 0 myprogram/21 23089 user 69 0.0 0.0 0.0 0.0 10 0.0 21 221 138 241 0 myprogram/4 .... ... 23089 user 68 0.0 0.0 0.0 0.0 10 0.0 22 206 155 223 0 myprogram/9 23089 user 68 0.0 0.0 0.0 0.0 10 0.0 22 215 136 232 0 myprogram/24 FX with 10ms ------------ PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 23105 user 78 0.1 0.1 0.0 0.0 1.3 0.0 21 168 1K 2K 0 myprogram/1 23105 user 68 0.0 0.1 0.0 0.0 10 0.0 21 241 1K 267 0 myprogram/2 23105 user 68 0.0 0.2 0.0 0.0 10 0.0 22 245 1K 270 0 myprogram/16 23105 user 68 0.0 0.2 0.0 0.0 10 0.0 22 246 1K 271 0 myprogram/25 .... ... 23105 user 68 0.0 0.1 0.0 0.0 10 0.0 22 255 1K 281 0 myprogram/8 23105 user 68 0.0 0.1 0.0 0.0 10 0.0 22 235 1K 260 0 myprogram/21 ... ... 23105 user 67 0.0 0.1 0.0 0.0 10 0.0 22 250 1K 273 0 myprogram/20 Stack traces of the program with FX 10ms ---------------------------------------- $ pstack 23137/25 23137: ./myprogram ----------------- lwp# 25 / thread# 25 -------------------- fffffd7ffa86abcb omp_set_lock () + 8b 000000000041e813 _$d1A593.mm_fv_update_nonbon () + 10c3 000001bd00000001 ???????? () 4054eef5073a9994 ???????? () $ pstack 23137/16 23137: ./myprogram ----------------- lwp# 16 / thread# 16 -------------------- 000000000041eb6d _$d1A593.mm_fv_update_nonbon () + 141d 000001bd00000001 ???????? () 4054ec19011d549c ???????? () $ pstack 23137/21 23137: ./myprogram ----------------- lwp# 21 / thread# 21 -------------------- 000000000041ebfa _$d1A593.mm_fv_update_nonbon () + 14aa 000001bd00000001 ???????? () 4054ea1dc63c899c ???????? () $ pstack 23137/2 23137: ./myprogram ----------------- lwp# 2 / thread# 2 -------------------- fffffd7ffa896f12 atomic_store () + 2 000000000041ec68 _$d1A593.mm_fv_update_nonbon () + 1518 000001bd00000001 ???????? () 4054e9adebe3c3da ???????? () -- This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org
