[L0] Support for counter-based events using L0 driver #1370

winstonzhang-intel · 2024-02-22T01:34:45Z

Counter-based events implementation.
Counter-based events can be enabled via the flag UR_L0_USE_DRIVER_COUNTER_BASED_EVENTS=1

Below are the three conformance tests that ensures that this implementation is working as expected:

PASS: SYCL :: InorderQueue/in_order_buffs.cpp (1 of 1)

Testing Time: 6.09s

Total Discovered Tests: 1
  Passed: 1 (100.00%)

PASS: SYCL :: InorderQueue/in_order_kernels.cpp (1 of 1)

Testing Time: 6.29s

Total Discovered Tests: 1
  Passed: 1 (100.00%)


PASS: SYCL :: Basic/in_order_queue_status.cpp (1 of 1)

Testing Time: 7.55s

Total Discovered Tests: 1
  Passed: 1 (100.00%)

LLVM Draft with CI passing: intel/llvm#12848
Rebased against Raiyan's in-order list implementation

codecov-commenter · 2024-02-22T01:49:58Z

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12.43%. Comparing base (78ef1ca) to head (c87300d).
Report is 199 commits behind head on main.

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@@            Coverage Diff             @@
##             main    #1370      +/-   ##
==========================================
- Coverage   14.82%   12.43%   -2.40%     
==========================================
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  Branches     4094     4111      +17     
==========================================
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mabraham · 2024-02-28T10:27:36Z

It's great to see things starting!

mabraham · 2024-02-28T10:22:36Z

source/adapters/level_zero/queue.cpp

@@ -1498,12 +1522,11 @@ ur_event_handle_t ur_queue_handle_t_::getEventFromQueueCache(bool IsMultiDevice,
 //        visible pool.
 // \param HostVisible tells if the event must be created in the
 //        host-visible pool. If not set then this function will decide.


doc missing

mabraham · 2024-02-28T10:25:11Z

source/adapters/level_zero/queue.cpp

+    ur_queue_handle_t Queue, ur_event_handle_t *Event, ur_command_t CommandType,
+    ur_command_list_ptr_t CommandList, bool IsInternal, bool IsMultiDevice,
+    std::optional<bool> HostVisible,
+    std::optional<bool> usingCounterBasedEvents) {


What's the advantage for optional<bool> compared to plain bool or always looking it up from Queue internally?

If we keep optional<bool>, then in several places where we are calling .value() on it the code is simpler if we write it like .value_or(false).

Good catch, let me fix that.

source/adapters/level_zero/queue.cpp

MichalMrozek

you can only use counter based events for in order queues, they do not work for out of order queues, you need to check sycl queue parameters instead of parsing over ze queues.
you cannot call reset on those events
why you disable fences ?
why you create all events with immediate and non immediate flags? Driver wouldn't be able to optimize this. Events should be selected basing on usage
why you add synchronous mode when counter based events are present ?
event pools are per context which can have in order and out of order queues, you need to differentiate when you obtain events to not get counter-based event for ooq.
you cannot evaluate each time ur_queue_handle_t_::usingCounterBasedEvents() , this needs to be const flag set at queue creation, in order queue cannot be made out of order queue, map browsing would kill perf

winstonzhang-intel · 2024-03-01T03:23:18Z

@MichalMrozek Thanks for the feedback.

you can only use counter based events for in order queues, they do not work for out of order queues, you need to check sycl queue parameters instead of parsing over ze queues.
I do make sure that we only use counter-based events for inOrderQueue. In additionally, I have to make sure that for the ZeQueues that are being used they have the ZE_COMMAND_QUEUE_FLAG_IN_ORDER flag
you cannot call reset on those events
Good catch, fixed
why you disable fences ?
My understanding was that with counter-based events, we no longer need barriers between the different lists, therefore, I removed the fences if we are using counter-based events.
why you create all events with immediate and non immediate flags? Driver wouldn't be able to optimize this. Events should be selected basing on usage
I agree, at first I was taking the L0 cts as example. But come to think of it this makes sense.
why you add synchronous mode when counter based events are present?
Same as above.
event pools are per context which can have in order and out of order queues, you need to differentiate when you obtain events to not get counter-based event for ooq.
you cannot evaluate each time ur_queue_handle_t_::usingCounterBasedEvents() , this needs to be const flag set at queue creation, in order queue cannot be made out of order queue, map browsing would kill perf
Agree, fixed.

MichalMrozek

It looks like this change has dependency on in order support

source/adapters/level_zero/event.cpp

MichalMrozek · 2024-03-01T11:23:59Z

source/adapters/level_zero/event.cpp

@@ -1124,8 +1129,8 @@ ur_result_t ur_event_handle_t_::reset() {

  if (!isHostVisible())
    HostVisibleEvent = nullptr;
-
-  ZE2UR_CALL(zeEventHostReset, (ZeEvent));
+  if (!UrQueue->usingCounterBasedEvents())


I think that event should know this instead of going to queue.

Agreed, I can keep track of it during the creation of event. However, if it is passed in I would have no way of querying eventpool_desc.pnext from eventpool

source/adapters/level_zero/queue.cpp

MichalMrozek · 2024-03-01T11:26:25Z

source/adapters/level_zero/queue.cpp

@@ -1818,6 +1850,9 @@ ur_queue_handle_t_::ur_queue_group_t::getZeQueue(uint32_t *QueueGroupOrdinal) {
  if (QueueIndex != 0) {
    ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_EXPLICIT_ONLY;
  }
+  if (Queue->usingCounterBasedEvents()) {


this should be other way around, if queue is in order , then you can create counter based events.

ZeQueue hasn't been created at this point. If we are using counter-based event then the zequeue needs to reflect that.

I believe @MichalMrozek is referring to the application Queue being passed in AKA the UR Queue object in this line. You can check if this Queue was created to be in-order using the Queue->isInOrderQueue(), since this is set on ur_queue creation.

Also I believe it should also be noted that ZE_COMMAND_QUEUE_FLAG_IN_ORDER flag should only used to create immediate command lists specifically using zeCommandListCreateImmediate(), while I see this function is used to create an ordinary queue for regular command lists using zeCommandQueueCreate(). Please correct me if I'm wrong @MichalMrozek

Reference at: https://spec.oneapi.io/level-zero/latest/core/api.html?highlight=ze_command_queue_flag_in_order#_CPPv4N23ze_command_queue_flag_t30ZE_COMMAND_QUEUE_FLAG_IN_ORDERE

Anyhow, the PR I have up for merging soon related to in-order at #1372 should cover the setting of these flags (ZE_COMMAND_QUEUE_FLAG_IN_ORDER for immediate command lists & ZE_COMMAND_LIST_FLAG_IN_ORDER for regular command lists) appropriately.

@raiyanla Thanks for your input. Queue->usingCounterBasedEvents() does check for whether the Queue is in order with Queue->isInOrderQueue(). It also checks for ZE_COMMAND_QUEUE_FLAG_IN_ORDER, which I believe is also required for zeCommandQueueCreate(). See example in L0 coformance test here

@winstonzhang-intel Gotcha, yeah I just saw your usingCounterBasedEvents() already checks for isInOrderQueue() inside of it now. Thanks for linking that L0 conformance test, that is interesting, it seems to conflict with the specification definition of it above, since the spec link indicates its ZE_COMMAND_QUEUE_FLAG_IN_ORDER should be for immediate command lists only. @MichalMrozek Can you confirm which is is appropriate? Since the spec and conformance tests are conflicting.

For regular command lists the flag is ZE_COMMAND_LIST_FLAG_IN_ORDER , passed in command list descriptor
For immediate command lists the flag is ZE_COMMAND_QUEUE_FLAG_IN_ORDER , passed in queue descriptor

MichalMrozek · 2024-03-01T11:26:52Z

source/adapters/level_zero/queue.cpp

  ZE2UR_CALL(zeCommandListCreate, (Context->ZeContext, Device->ZeDevice,
                                   &ZeCommandListDesc, &ZeCommandList));

-  ZE2UR_CALL(zeFenceCreate, (ZeCommandQueue, &ZeFenceDesc, &ZeFence));
+  if (!usingCounterBasedEvents()) {
+    ZE2UR_CALL(zeFenceCreate, (ZeCommandQueue, &ZeFenceDesc, &ZeFence));


do not disable fences, they are still needed to recycle command lists.

pbalcer · 2024-03-05T09:14:02Z

source/adapters/level_zero/event.hpp

+ur_result_t
+EventCreate(ur_context_handle_t Context, ur_queue_handle_t Queue,
+            bool IsMultiDevice, bool HostVisible, ur_event_handle_t *RetEvent,
+            std::optional<bool> CounterBasedEventEnabled = std::nullopt);


Suggested change

std::optional<bool> CounterBasedEventEnabled = std::nullopt);

bool CounterBasedEventEnabled = false);

?

pbalcer · 2024-03-05T09:16:07Z

source/adapters/level_zero/context.cpp

@@ -468,7 +468,8 @@ static const uint32_t MaxNumEventsPerPool = [] {

 ur_result_t ur_context_handle_t_::getFreeSlotInExistingOrNewPool(


there's ought to be a better way of allocating an event that doesn't require passing around half a dozen arguments to multiple functions. Maybe some sort of flag?

auto event = Pool->allocateEvent(HOST_VISIBLE | ENABLE_PROFILER | COUNTER_BASED);

having functions that accept multiple boolean values is error prone.

@pbalcer Thanks for the feedback! We could create a new enum just for this case. However, this seems to be a bit overkill just for this one function. It is only used once event.cpp during event creation.

It's not just this function. All the various boolean event parameters are being passed around in multiple functions. Just from a quick search:
createEventAndAssociateQueue, getEventFromQueueCache, EventCreate, getEventFromContextCache, getFreeSlotInExistingOrNewPool, getZeEventPoolCache

@pbalcer This is quite a large refactoring. Functions with these booleans are abundant. Additionally, it would make sense to add this in ur_api, however, we would need to add this in spec before I can do so. Perhaps I can file a new ticket and have this be its own patch?

Sure, this was just a suggestion.

pbalcer · 2024-03-05T09:19:03Z

source/adapters/level_zero/context.cpp

@@ -510,6 +511,12 @@ ur_result_t ur_context_handle_t_::getFreeSlotInExistingOrNewPool(
      ZeEventPoolDesc.flags |= ZE_EVENT_POOL_FLAG_HOST_VISIBLE;
    if (ProfilingEnabled)
      ZeEventPoolDesc.flags |= ZE_EVENT_POOL_FLAG_KERNEL_TIMESTAMP;
+    if (CounterBasedEventEnabled) {
+      ZeEventPoolDesc.flags |= ZE_EVENT_POOL_FLAG_HOST_VISIBLE;
+      ze_event_pool_counter_based_exp_desc_t counterBasedExt = {


I think you might need to update the getZeEventPoolCache(HostVisible, ProfilingEnabled, ZeDevice); call above. Otherwise, based on what the queue was that happened to call this function first for this combination of parameters, the event pool might or might not have this flag set.

And, again, I suggest a small refactoring here to use flags (or some other mechanism) instead of passing yet another boolean.

The Queue should have the flag set on creation. Because of that, all the subsequent eventpools should be cached with counter-based events enabled.

But this cache is in the context, so if you have two queues, one with counter-based events enabled and one without, the one that was first in this function will create the event pool.

event pools are stored in context not in a queue
There may be different types of queues coming in and they would require different type of events.
Pool cannot return incompatible event.

Using the same mechanism as previously implemented, the eventpool cache returned will be guaranteed to be with counterbased enabled if it is selected, since now there is a portion of the eventpoolcache that is reserved just for counterbased event pools.

👍 this desperately needs a refactor though :)

I'll file a ticket tomorrow for all the refactoring, should be pretty straight forward 👍

source/adapters/level_zero/context.cpp

MichalMrozek · 2024-03-12T08:42:50Z

source/adapters/level_zero/context.hpp

-      } else {
-        return WithProfiling ? &ZeEventPoolCache[0] : &ZeEventPoolCache[1];
-      }
+      profiling_index_a = 0;


what this logic is doing ?
is it to choose cache index?

yes to choose the cache index depending on hostVisible and CounterBasedEventEnabled.

MichalMrozek · 2024-03-12T08:43:19Z

source/adapters/level_zero/context.hpp

+      profiling_index_b = 3;
+    }
+    if (CounterBasedEventEnabled) {
+      profiling_index_a += 4;


please avoid magic numbers, please move this logic to separate helper function

MichalMrozek · 2024-03-12T08:43:36Z

source/adapters/level_zero/context.hpp

  std::vector<std::unordered_map<ze_device_handle_t, size_t>>
-      ZeEventPoolCacheDeviceMap{4};
+      ZeEventPoolCacheDeviceMap{8};


2 EventPoolCacheDeviceMap reserved for each: hostVisible, not hostvisible, device and hostvisible and device and not hostvisible. Since we can't query the ext flags of eventpooldesc from eventpoolhandle, we have to reserve the space in case of each of these situations.

What if you need profiling on top of that?
Which pool would you choose?

If you want to permute all combination this would quickly be out of control.

host visible

counter based for immediate

counter based for non immediate

profiling

we are already at 16

MichalMrozek · 2024-03-12T08:44:52Z

source/adapters/level_zero/queue.cpp

-  if (QueueIndex != 0) {
+  if (Queue->Device->useDriverInOrderLists() && Queue->isInOrderQueue()) {
+    ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_IN_ORDER;
+  } else if (QueueIndex != 0) {


why this logic is in else?
it applies to in order queues as well

This is part of the in-order list patch Not related to counter-based events.

can you re-base ?
the in order patch is merged and has different change here

MichalMrozek · 2024-03-12T08:45:08Z

source/adapters/level_zero/queue.cpp

@@ -1820,6 +1836,11 @@ ur_queue_handle_t_::ur_queue_group_t::getZeQueue(uint32_t *QueueGroupOrdinal) {
  if (QueueIndex != 0) {
    ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_EXPLICIT_ONLY;
  }
+  /*


why code is commented?
please remove if not needed

MichalMrozek

please re-base patch after in order command list change, right now it is hard to distinguish what are new additions and what comes from in order lists patch.

MichalMrozek · 2024-03-14T16:43:14Z

source/adapters/level_zero/context.hpp

+                                  int *profiling_index_a,
+                                  int *profiling_index_b) {
+    if (HostVisible) {
+      *profiling_index_a = 0;


can you make this code more maintainable ?
assign some enum for each pool type, shift by enum sizes ?

Right now it would be very difficult to understand what is happening here and why, also profiling_index_a and profiling_index_b doesn't tell a lot what happens here.

MichalMrozek · 2024-03-14T16:44:50Z

source/adapters/level_zero/queue.cpp

-  if (QueueIndex != 0) {
+  if (Queue->Device->useDriverInOrderLists() && Queue->isInOrderQueue()) {
+    ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_IN_ORDER;
+  } else if (QueueIndex != 0) {


can you re-base ?
the in order patch is merged and has different change here

winstonzhang-intel · 2024-03-26T22:52:43Z

you can only use counter based events for in order queues, they do not work for out of order queues, you need to check sycl queue parameters instead of parsing over ze queues.

you cannot call reset on those events

why you disable fences ?

why you create all events with immediate and non immediate flags? Driver wouldn't be able to optimize this. Events should be selected basing on usage

why you add synchronous mode when counter based events are present ?

event pools are per context which can have in order and out of order queues, you need to differentiate when you obtain events to not get counter-based event for ooq.

you cannot evaluate each time ur_queue_handle_t_::usingCounterBasedEvents() , this needs to be const flag set at queue creation, in order queue cannot be made out of order queue, map browsing would kill perf

So, the CI failure here: urUSMHostAllocTest.Success/Intel_R__oneAPI_Unified_Runtime_over_Level_Zero___Intel_R__Arc_TM__A750_Graphics
is because the reused counting event is coming up as signaled so it immediately completes. Either this is a bug in the L0 gpu driver if the spec says we cannot reset or we are missing something in this implementation.

Issue is fixed in the latest patch, the issue was the desc was not being used.

Thank you @nrspruit for looking into this. Once this patch is merged I will post another for the refactoring that @pbalcer requested.

source/adapters/level_zero/queue.hpp

source/adapters/level_zero/queue.cpp

source/adapters/level_zero/event.hpp

source/adapters/level_zero/command_buffer.cpp

commit tag: 9b82c1d0a6df26d96797218d6964faf0e6dbc0ce URT PR: oneapi-src/unified-runtime#1370 Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

nrspruit

LGTM with the updated changes.

Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

Now counter based events will be enabled by default only on PVC+, and only enabled for immCmdLists. Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

…#12848) commit tag: 4134bfce72d33e89eebcad11186bdf00310bba83 URT PR: oneapi-src/unified-runtime#1370 --------- Signed-off-by: Zhang, Winston <winston.zhang@intel.com> Co-authored-by: Kenneth Benzie (Benie) <k.benzie@codeplay.com>

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[UR][L0] Testing for counter-based-events implementation in URT draft intel/llvm#12848

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winstonzhang-intel changed the title ~~[UR] Draft for adding support for counter-based events~~ [L0] Support for counter-based events using L0 driver Mar 5, 2024

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[L0] Fix regular in order command list reuse given inorder queue #1483

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[L0] Rebase and fix conflicts

a5427a2

Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

[L0] Enable CB events only on PVC+ and immCmdLists

b54e7f1

Now counter based events will be enabled by default only on PVC+, and only enabled for immCmdLists. Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

[L0] default option pvc with counterbased events

39fcb2b

Signed-off-by: Zhang, Winston <winston.zhang@intel.com>

winstonzhang-intel force-pushed the counter-based-events branch from cfde409 to 39fcb2b Compare April 25, 2024 18:58

kbenzie merged commit f4a9497 into oneapi-src:main Apr 26, 2024
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	std::optional<bool> CounterBasedEventEnabled = std::nullopt);
	bool CounterBasedEventEnabled = false);

		@@ -468,7 +468,8 @@ static const uint32_t MaxNumEventsPerPool = [] {

		ur_result_t ur_context_handle_t_::getFreeSlotInExistingOrNewPool(

[L0] Support for counter-based events using L0 driver #1370

[L0] Support for counter-based events using L0 driver #1370

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