c-store | C-Store : A column-oriented DBMS prototype | Database library

Based on my understanding of the question, I recommend using the following two events on the specified processor:

• OFFCORE_RESPONSE.ALL_READS.L3_MISS.LOCAL_DRAM: This includes all cacheable data read and write transactions and all code fetch transactions, whether the transaction is initiated by a instruction (retired or not) or a prefetch or any type. Each event represents exactly a 64-byte read request to the memory controller.
• OFFCORE_RESPONSE.ALL_CODE_RD.L3_MISS.LOCAL_DRAM: This includes all the code fetch accesses to the IMC.

(I think both of these event don't occur for uncacheable code fetch requests, but I've not tested this and the documentation is not clear on this.)

The "data accesses" can be measured separately from the "code accesses" by subtracting the second event from the first. These two events can be counted simultaneously on the same logical core on Haswell without multiplexing.

There are of course other transactions that do go to the IMC but are not counted by either of the two mentioned events. These include: (1) L3 writebacks, (2) uncacheable partial reads and writes from cores, (3) full WCB evictions, and (4) memory accesses from IO devices. Depending on the workload, It's not unlikely that accesses of types (1), (3), and (4) may constitute a significant fraction of total accesses to the IMC.

It seems that the sum of LLC-load-misses and LLC-store-misses will return the whole DRAM accesses (equivalently, I could use LLC-misses in Perf).

Note the following:

• The event LLC-load-misses is a perf event mapped to the native event OFFCORE_RESPONSE.DEMAND_DATA_RD.L3_MISS.ANY_RESPONSE.
• The event LLC-store-misses is mapped to OFFCORE_RESPONSE.DEMAND_RFO.L3_MISS.ANY_RESPONSE.

These are not the events you want because:

• The ANY_RESPONSE bit indicates that the event can occur for requests that target any unit, not just the IMC.
• These events count L1 data prefetches and page walk requests, but not L2 data prefetches. You'd want to count all prefetches that consume memory bandwdith in general.

For data-only accesses, I used mem_load_uops_retired.l3_miss. It does not include stores, but seems to be OK (because stores seem to be much less frequent?!).

There are a number of issues with using mem_load_uops_retired.l3_miss on Haswell:

• There are cases where this event is unreliable, so it should be avoided if there are alternatives. Otherwise, the analysis methodology should take in to account the potential unreliability of this event count.
• The event only occurs for requests from retired loads and it omits speculative loads and all stores, which can be significant.
• Doing arithmetic with this events and other events in a meaningful way is not easy. For example, your suggestion of doing "LLC-load-misses - mem_load_uops_retired.l3_miss = DRAM Accesses for Code" is incorrect.

What are local_dram and any_response?

Not all requests that miss in the L3 go to the IMC. A typical example is memory-mapped IO requests. You said you only want the core-originated requests that go to the IMC, so local_dram is the right bit.

At first, it seems that, group (C), is a higher resolution version of the load events of group (A). But my tests show that the events in the former group is much more frequent than the latter. For example, in a simple benchmark, the number of offcore_response.all_reads.l3_miss.any_response events were twice as many as LLC-load-misses.

This is normal because offcore_response.all_reads.l3_miss.any_response is inclusive of LLC-load-misses and can easily be significantly larger.

Group (E), pertains to demand reads (i.e., all non-prefetched reads). Does this mean that, e.g.: offcore_response.all_data_rd.l3_miss.any_response - offcore_response.demand_data_rd.l3_miss.any_response = DRAM read accesses caused by prefeching?

No, because:

• the any_response bit as explained above,
• this subtraction results in only the L2 data load prefetches, not all data load hardware and software prefetches.

In your history.service.ts, declare it this way:

In your dependency declaration for org.apache.activemq:artemis-jms-client you can exclude org.apache.geronimo.specs:geronimo-jms_2.0_spec, e.g.:

An instance of type SideProcessor has the following fields:

C++ is statically typed.

If you just want the size, use head object operation.

i think you have to put the whole thing in a route guard.

create a route-guard.js plugin like this. but I haven't tested the whole thing, hope it helps you further.

Looking at source code on github, it seems the exception is recently added.

I found the solution.

Somehow, GEPACS send the certain transfer syntax for JPEG compression. if go-netdicom doesn't have the TransferSyntaxUID then pick the GEPACS's first transfer syntax and that was for JPEG compression.

i just put bigendian and explicitvr (GEPACS default) when transfersyntax is empty.

which placed in contextmanager.go line 101 on AssociateRequest, line 127

Hope this result help someone.

Thank you