Re: profiling connection overhead

On Wed, Nov 24, 2010 at 5:15 PM, Andres Freund <andres@anarazel.de> wrote:
> On Wednesday 24 November 2010 23:03:48 Tom Lane wrote:
>> Robert Haas <robertmhaas@gmail.com> writes:
>> > On Wed, Nov 24, 2010 at 4:05 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> >> (You might be able to confirm or disprove this theory if you ask
>> >> oprofile to count memory access stalls instead of CPU clock cycles...)
>> >
>> > I don't see an event for that.
>>
>> You probably want something involving cache misses.  The event names
>> vary depending on just which CPU you've got.
> Or some BUS OUTSTANDING event.

I don't see anything for BUS OUTSTANDING.  For CACHE and MISS I have
some options:

# opcontrol --list-events | grep CACHE
DATA_CACHE_ACCESSES: (counter: all)
DATA_CACHE_MISSES: (counter: all)
DATA_CACHE_REFILLS_FROM_L2_OR_NORTHBRIDGE: (counter: all)
DATA_CACHE_REFILLS_FROM_NORTHBRIDGE: (counter: all)
DATA_CACHE_LINES_EVICTED: (counter: all)
LOCKED_INSTRUCTIONS_DCACHE_MISSES: (counter: all)
L2_CACHE_MISS: (counter: all)
L2_CACHE_FILL_WRITEBACK: (counter: all)
INSTRUCTION_CACHE_FETCHES: (counter: all)
INSTRUCTION_CACHE_MISSES: (counter: all)
INSTRUCTION_CACHE_REFILLS_FROM_L2: (counter: all)
INSTRUCTION_CACHE_REFILLS_FROM_SYSTEM: (counter: all)
INSTRUCTION_CACHE_VICTIMS: (counter: all)
INSTRUCTION_CACHE_INVALIDATED: (counter: all)
CACHE_BLOCK_COMMANDS: (counter: all)
READ_REQUEST_L3_CACHE: (counter: all)
L3_CACHE_MISSES: (counter: all)
IBS_FETCH_ICACHE_MISSES: (ext: ibs_fetch)
IBS_FETCH_ICACHE_HITS: (ext: ibs_fetch)
IBS_OP_DATA_CACHE_MISS: (ext: ibs_op)
IBS_OP_NB_LOCAL_CACHE: (ext: ibs_op)
IBS_OP_NB_REMOTE_CACHE: (ext: ibs_op)
IBS_OP_NB_CACHE_MODIFIED: (ext: ibs_op)
IBS_OP_NB_CACHE_OWNED: (ext: ibs_op)
IBS_OP_NB_LOCAL_CACHE_LAT: (ext: ibs_op)
IBS_OP_NB_REMOTE_CACHE_LAT: (ext: ibs_op)

# opcontrol --list-events | grep MISS | grep -v CACHE
L1_DTLB_MISS_AND_L2_DTLB_HIT: (counter: all)
L1_DTLB_AND_L2_DTLB_MISS: (counter: all)
L1_ITLB_MISS_AND_L2_ITLB_HIT: (counter: all)
L1_ITLB_MISS_AND_L2_ITLB_MISS: (counter: all)
MEMORY_CONTROLLER_SLOT_MISSED: (counter: all)
IBS_FETCH_L1_ITLB_MISSES_L2_ITLB_HITS: (ext: ibs_fetch)
IBS_FETCH_L1_ITLB_MISSES_L2_ITLB_MISSES: (ext: ibs_fetch)
IBS_OP_L1_DTLB_MISS_L2_DTLB_HIT: (ext: ibs_op)
IBS_OP_L1_L2_DTLB_MISS: (ext: ibs_op)

--
Robert Haas
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