The clock runs at 10msec. rick On Fri, Jan 28, 2011 at 11:28:53PM -0800, Kishore Kumar Pusukuri wrote: > X-CAA-SPAM: N00000 > X-Authority-Analysis: v=1.1 cv=yQYQEjLqlzdS2bErF6XCxOX9gO4Oas8ddBV9bGWsH/s= > c=1 sm=1 a=Oo0928fOrbMA:10 a=RKG6q5SKwUUA:10 a=kj9zAlcOel0A:10 > a=zRG8QCroJ/deLx9kZ5Uhsg==:17 a=ep_KMAzDAAAA:8 a=gyW8Hqc3smSFHBCbJBoA:9 > a=fnZI9btXys-P7aBi_xgA:7 a=z08ifX2rIDMeJxWXCXfDxvful6UA:4 > a=CjuIK1q_8ugA:10 a=RD1bzJOsQUcA:10 a=TC1Ce7_l9HwA:10 > a=zRG8QCroJ/deLx9kZ5Uhsg==:117 > X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on > lv-drc6.opensolaris.org > X-Spam-Level: > X-Spam-Status: No, score=-1.0 required=5.0 tests=AWL,BAYES_00,RDNS_DYNAMIC, > TO_NO_BRKTS_DYNIP autolearn=no version=3.3.1 > X-Original-To: perf-discuss@opensolaris.org > Delivered-To: perf-discuss@opensolaris.org > Date: Fri, 28 Jan 2011 23:28:53 PST > From: Kishore Kumar Pusukuri <kish...@cs.ucr.edu> > To: perf-discuss@opensolaris.org > Subject: [perf-discuss] system traps with FX scheduling policy > X-BeenThere: perf-discuss@opensolaris.org > X-Mailman-Version: 2.1.13 > Precedence: list > List-Id: Performance General Discussion <perf-discuss.opensolaris.org> > List-Unsubscribe: <http://mail.opensolaris.org/mailman/options/perf-discuss>, > <mailto:perf-discuss-requ...@opensolaris.org?subject=unsubscribe> > List-Archive: <http://mail.opensolaris.org/pipermail/perf-discuss> > List-Post: <mailto:perf-discuss@opensolaris.org> > List-Help: <mailto:perf-discuss-requ...@opensolaris.org?subject=help> > List-Subscribe: <http://mail.opensolaris.org/mailman/listinfo/perf-discuss>, > <mailto:perf-discuss-requ...@opensolaris.org?subject=subscribe> > Errors-To: perf-discuss-boun...@opensolaris.org > > 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 > _______________________________________________ > perf-discuss mailing list > perf-discuss@opensolaris.org
-- Rickey C. Weisner Software Development and Performance Specialist Principal Software Engineer Systems Quality Office Oracle Corporation cell phone: 615-308-1147 email: rick.weis...@oracle.com _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
