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Engine Activity Extension

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Engine Activity Extension#

API#

Engine Activity#

This extension provides capability to user to gather the activity stats for each Virtual Function (VF) associated with engine group. Intended use case of the feature is to query utilization stats from Physical Function (PF) interface. However, the extension may return error code ZE_RESULT_ERROR_UNSUPPORTED_FEATURE if an environment does not support it. If VF has no activity value to report, then implementation shall reflect that appropriately in zes_engine_stats_t struct so that percentage calculation results in value of 0. If PF has no activity value to report, then implementation shall reflect that appropriately in zes_engine_stats_t struct which is at index 0 of the output vector such that utilization calculation results in value of 0.

The following pseudo-code demonstrates a sequence for obtaining the engine activity for all Virtual Functions from Physical Function environment:

// Query for engine properties and gather number of virtual function instances by passing extension structure.
// Number of VFs is per engine handle and equates to number of VFs actively using
// the resource represented by the engine handle.
// Together with pCount from GetActivityExt, user can gather the full view of engine
// utilization for all VFs and PF as shown below

zes_engine_properties_t engineProps;
zes_engine_ext_properties_t engineExtProps;
engineProps.stype = ZES_STRUCTURE_TYPE_ENGINE_PROPERTIES;
engineProps.pNext = &engineExtProps;
engineExtProps.stype = ZES_STRUCTURE_TYPE_ENGINE_EXT_PROPERTIES;

zesEngineGetProperties(hEngine, &engineProps);

// Query count of engine stats to gather
// this count is inclusive of PF and N number of VFs
// i.e. if engineStatCount = 4, then this implies, one PF engine stat at index 0
//      of output vector followed by engine stats for 3 VFs
uint32_t engineStatCount = 0;
{s}EngineGetActivityExt(hEngine, &engineStatCount, nullptr);

// Gather engine stats for all VFs and PF.
// Gather two snapshots of engine activity and calculate percentage
// utilization per formula in zes_engine_stats_t
zes_engine_stats_t* engineStats0 = (zes_engine_stats_t*) allocate(engineStatCount * sizeof(zes_engine_stats_t));
{s}EngineGetActivityExt(hEngine, &engineStatCount, engineStats0);
sleep(1);
zes_engine_stats_t* engineStats1 = (zes_engine_stats_t*) allocate(engineStatCount * sizeof(zes_engine_stats_t));
{s}EngineGetActivityExt(hEngine, &engineStatCount, engineStats1);

for (uint32_t idx = 0; idx < engineStatCount; ++idx) {
    double utilization = (engineStats1[idx].activeTime - engineStats0[idx].activeTime)/(engineStats1[idx].timestamp - engineStats0[idx].timestamp);
    output("%s Utilization of engine type pertaining to this handle = %.2fn", (idx == 0) ? "PF" : "VF", utilization);
}
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