Eric, If you are interested in tying DTLB misses to specific regions of user source code, please consider using 'collect' and 'analyzer'. The latest builds of these tools for Opteron can be found here:
/set/mars/dist/intel-S2/bin An example of using collect: collect -p on -h dtlbm,hi a.out analyzer test.1.er er_print -pc test.1.er ... Excl. Incl. Excl. DTLB Incl. DTLB Name User CPU User CPU Misses Misses sec. sec. 10.337 10.337 1801261 1801261 <Total> 0.440 0.440 100070 100070 test_loop + 0x000000A8, line 286 in "thrashfpleak.c" 0.430 0.430 50035 50035 test_loop + 0x00000080, line 277 in "thrashfpleak.c" 0.420 0.420 70049 70049 test_loop + 0x00000076, line 275 in "thrashfpleak.c" ... Yukon Yu Xiangning wrote On 10/31/06 22:11,: > Hi folks, > > While investigating a performance problem in my prototype workspace, I > found that the dtlb-miss rate is about 16% higher than that of the > baseline, so I suspect that the high tlb miss could be the issue. > > So, how can I get the statistics on the PC addresses when the tlb miss > happens? Can DTrace or some other facilities help here? Thank you in > advance! > > - yxn > > The attached in the sample trapstat output: (ignored the itlb column) > > Mine: > cpu m size| dtlb-miss %tim dtsb-miss %tim |%tim > ----------+-------------------------------+---- > 0 u 8k| 7399 0.3 0 0.0 | 0.3 > 0 u 64k| 0 0.0 0 0.0 | 0.0 > 0 u 512k| 0 0.0 0 0.0 | 0.0 > 0 u 4m| 0 0.0 0 0.0 | 0.0 > - - - - - + - - - - - - - - - - - - - - - + - - > 0 k 8k| 397423 14.5 237 0.0 |14.5 > 0 k 64k| 0 0.0 0 0.0 | 0.0 > 0 k 512k| 0 0.0 0 0.0 | 0.0 > 0 k 4m| 0 0.0 0 0.0 | 0.0 > ==========+===============================+==== > ttl | 404822 14.7 237 0.0 |14.8 > > Baseline: > cpu m size| dtlb-miss %tim dtsb-miss %tim |%tim > 0 u 8k| 8667 0.3 9 0.0 | 0.3 > 0 u 64k| 0 0.0 0 0.0 | 0.0 > 0 u 512k| 0 0.0 0 0.0 | 0.0 > 0 u 4m| 0 0.0 0 0.0 | 0.0 > - - - - - + - - - - - - - - - - - - - - - + - - > 0 k 8k| 342333 12.5 233 0.0 |12.6 > 0 k 64k| 0 0.0 0 0.0 | 0.0 > 0 k 512k| 0 0.0 0 0.0 | 0.0 > 0 k 4m| 21 0.0 0 0.0 | 0.0 > ==========+===============================+==== > ttl | 351021 12.8 242 0.0 |12.9 > > > _______________________________________________ > perf-discuss mailing list > perf-discuss@opensolaris.org _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
