[Gems-users] ruby periodic statistic file

[Carole-Jean Wu <carolewu@xxxxxxxxxxxxx>]

Hello list,

I am dumping ruby statistics periodically (period = 10000000) for mcf running on core1 in a 4-core CMP setup. And, I am showing the last entry in my periodic statistic file below.

The number instructions executed is 9,691,680,772 and the number of "total_misses" is 132,986,026.

Then, I inserted one print statement in the beginning of makeRequest(...) in system/Sequencer.C to get the memory trace for all memory references for core1, where mcf is pinned to. If I count the number of print statements in the trace file, there are only 253,260,832 entries. The ratio of #memory ref. and #inst. executed does not make sense. It is way too smaller than what's published. 

Does anyone have an idea what causes this discrepancy? Are there other "built-in" counters in ruby, which I can use to count the number of memory references issued? 

Thanks in advance,

Carole Wu


ruby_cycles: 47430000001
total_misses: 170926472 [ 7015840 132986026 13365208 17559398 ]
instruction_executed: 536087641076 [ 183497245022 9691680772 174930542212 167968173070 ]
simics_cycles_executed: 758880000088 [ 189720000005 189720000001 189720000001 189720000081 ]
mbytes_resident: 3435.67
mbytes_total: 3576.32
Total_misses: 170926472
total_misses: 170926472 [ 7015840 132986026 13365208 17559398 ]
user_misses: 117489130 [ 189887 113459585 218853 3620805 ]
supervisor_misses: 53437342 [ 6825953 19526441 13146355 13938593 ]

instruction_executed: 536087641076 [ 183497245022 9691680772 174930542212 167968173070 ]
simics_cycles_executed: 758880000088 [ 189720000005 189720000001 189720000001 189720000081 ]
cycles_per_instruction: 0.353897 [ 0.258478 4.89389 0.271136 0.282375 ]
misses_per_thousand_instructions: 0.318841 [ 1.32608e-312 2.31786e-310 8.48798e-314 3.74348e+150 ]


Simics Driver Transaction Stats
----------------------------------
Insn requests: 0
Data requests: 7715315597
Memory mapped IO register accesses: 0
Device initiated accesses: 52977
Other initiated accesses: 0
Atomic load accesses: 374534
Exceptions: 5906478
Non stallable accesses: 225508306
Prefetches: 135612838
Cache Flush: 0
.
.
.

Simics Driver Transaction Results Stats
------------------------------------------
Fast path: 7348192646
Request missed: 231457136
Sequencer not ready: 0
Duplicate instruction fetches: 0
Hit return: 228552370
Atomic last accesses: 5663149
L1D_cache cache stats: 
  L1D_cache_total_misses: 231457136
  L1D_cache_total_demand_misses: 231457136

.
.
.

L2_cache cache stats: 
  L2_cache_total_misses: 170926472
  L2_cache_total_demand_misses: 170926472
.
.
.