diff --git a/examples/nvperf.jl b/examples/nvperf.jl
new file mode 100644
index 0000000000..7421b9ead2
--- /dev/null
+++ b/examples/nvperf.jl
@@ -0,0 +1,21 @@
+using CUDA
+
+NVPERF.initialize()
+CUPTI.initialize_profiler()
+
+avail = CUPTI.counter_availability()
+chip = first(NVPERF.supported_chips())
+
+me = NVPERF.CUDAMetricsEvaluator(chip, avail)
+
+NVPERF.list_metrics(me)
+
+m = NVPERF.Metric(me, "dram__bytes.sum.per_second")
+description, unit = NVPERF.properties(m)
+@show description
+@show string(unit)
+
+@show NVPERF.MetricEvalRequest(me, "dram__bytes.sum.per_second")
+
+# Need counterDataImage
+# then range then 
\ No newline at end of file
diff --git a/lib/cupti/wrappers.jl b/lib/cupti/wrappers.jl
index 6e81f01503..ab9a03a9df 100644
--- a/lib/cupti/wrappers.jl
+++ b/lib/cupti/wrappers.jl
@@ -3,3 +3,94 @@ function version()
     cuptiGetVersion(version_ref)
     VersionNumber(version_ref[])
 end
+
+    # params = Ref(CUpti_Profiler_CounterDataImage_CalculateSize_Params(
+    #     CUpti_Profiler_CounterDataImage_CalculateSize_Params_STRUCT_SIZE,
+    #     C_NULL, 0, C_NULL, 0))
+    # cuptiProfilerCounterDataImageCalculateSize(params)
+
+
+function initialize_profiler()
+    params = Ref(CUpti_Profiler_Initialize_Params(
+        CUpti_Profiler_Initialize_Params_STRUCT_SIZE,
+        C_NULL))
+    cuptiProfilerInitialize(params)
+end
+
+function deinitalize_profiler()
+    params = Ref(CUpti_Profiler_DeInitialize_Params(
+        CUpti_Profiler_DeInitialize_Params_STRUCT_SIZE,
+        C_NULL))
+    cuptiProfilerDeInitialize(params)
+end
+
+function counter_availability(ctx = context())
+    # 1. Query size
+    params = Ref(CUpti_Profiler_GetCounterAvailability_Params(
+        CUpti_Profiler_GetCounterAvailability_Params_STRUCT_SIZE,
+        C_NULL, ctx.handle, 0, C_NULL))
+    cuptiProfilerGetCounterAvailability(params)
+
+    sz = params[].counterAvailabilityImageSize
+    buffer = Vector{UInt8}(undef, sz)
+
+    GC.@preserve buffer begin
+        params = Ref(CUpti_Profiler_GetCounterAvailability_Params(
+        CUpti_Profiler_GetCounterAvailability_Params_STRUCT_SIZE,
+        C_NULL, ctx.handle, sz, pointer(buffer)))
+        cuptiProfilerGetCounterAvailability(params)
+    end
+    return buffer
+end
+
+abstract type CounterDataBuilder end
+function prefix end 
+
+function CounterDataImage(builder, maxNumRanges, maxNumRangeTreeNodes, maxRangeNameLength)
+    p = prefix(builder)
+    GC.@preserve p begin
+        options = Ref(CUpti_Profiler_CounterDataImageOptions(
+            CUpti_Profiler_CounterDataImageOptions_STRUCT_SIZE,
+            C_NULL, pointer(p), length(p), maxNumRanges, maxNumRangeTreeNodes, maxRangeNameLength))
+
+        GC.@preserve options begin
+            params = Ref(CUpti_Profiler_CounterDataImage_CalculateSize_Params(
+                CUpti_Profiler_CounterDataImage_CalculateSize_Params_STRUCT_SIZE,
+                C_NULL, CUpti_Profiler_CounterDataImageOptions_STRUCT_SIZE, pointer(options), 0))
+            CUpti_Profiler_CounterDataImage_CalculateSize(params)
+            sz = params[].CounterDataImageSize
+        end 
+        dataImage = Vector{UInt8}(undef, sz)
+        GC.@preserve options dataImage begin
+            params = Ref(CUpti_Profiler_CounterDataImage_Initialize_Params(
+                CUpti_Profiler_CounterDataImage_Initialize_Params_STRUCT_SIZE,
+                C_NULL, CUpti_Profiler_CounterDataImageOptions_STRUCT_SIZE, pointer(options),
+                sz, pointer(dataImage)))
+            CUpti_Profiler_CounterDataImage_Initialize(params)
+        end
+    end
+
+    GC.@preserve dataImage begin
+        params = Ref(CUpti_Profiler_CounterDataImage_CalculateScratchBufferSize_Params(
+            CUpti_Profiler_CounterDataImage_CalculateScratchBufferSize_Params_STRUCT_SIZE,
+            C_NULL, sz, pointer(dataImage),0))
+        CUpti_Profiler_CounterDataImage_CalculateScratchBufferSize(params)
+        scratch_sz = params[].counterDataScratchBufferSize
+    end
+    scratch = Vector{UInt8}(undef, scratch_sz)
+    GC.@preserve dataImage scratch begin
+        params = Ref(CUpti_Profiler_CounterDataImage_InitializeScratchBuffer_Params(
+            CUpti_Profiler_CounterDataImage_InitializeScratchBuffer_Params_STRUCT_SIZE,
+            C_NULL, sz, pointer(dataImage),scratch_sz, pointer(scratch)))
+        CUpti_Profiler_CounterDataImage_InitializeScratchBuffer(params)
+    end
+
+    return (; dataImage, scratch)
+end
+
+
+mutable struct CounterDataImage
+
+
+end
+
diff --git a/lib/nvperf/wrappers.jl b/lib/nvperf/wrappers.jl
index 91cfe1ac27..ebbf2ae442 100644
--- a/lib/nvperf/wrappers.jl
+++ b/lib/nvperf/wrappers.jl
@@ -15,3 +15,192 @@ function supported_chips()
     end
     return names
 end
+
+function scratch_buffer(chipName, counter_availability)
+    GC.@preserve chipName counter_availability begin
+        params = Ref(NVPW_CUDA_MetricsEvaluator_CalculateScratchBufferSize_Params(
+            NVPW_CUDA_MetricsEvaluator_CalculateScratchBufferSize_Params_STRUCT_SIZE,
+            C_NULL, pointer(chipName), pointer(counter_availability), 0
+        ))
+        NVPW_CUDA_MetricsEvaluator_CalculateScratchBufferSize(params)
+        sz = params[].scratchBufferSize
+    end
+    return Vector{UInt8}(undef, sz)
+end
+
+abstract type MetricsEvaluator end
+
+mutable struct CUDAMetricsEvaluator <: MetricsEvaluator
+    handle::Ptr{NVPW_MetricsEvaluator}
+    scratch::Vector{UInt8}
+    availability::Vector{UInt8}
+    chip::String
+
+    function CUDAMetricsEvaluator(chip, availability)
+        scratch = scratch_buffer(chip, availability)
+
+        GC.@preserve chip availability scratch begin
+            params = Ref(NVPW_CUDA_MetricsEvaluator_Initialize_Params(
+                NVPW_CUDA_MetricsEvaluator_Initialize_Params_STRUCT_SIZE,
+                C_NULL, pointer(scratch), length(scratch), pointer(chip),
+                pointer(availability), C_NULL, 0, C_NULL))
+            
+            NVPW_CUDA_MetricsEvaluator_Initialize(params)
+            this =  new(params[].pMetricsEvaluator, scratch, availability, chip)
+        end
+        finalizer(destroy, this)
+        return this
+    end
+end
+Base.unsafe_convert(::Type{Ptr{NVPW_MetricsEvaluator}}, me::CUDAMetricsEvaluator) = me.handle
+
+
+function destroy(me::MetricsEvaluator)
+    GC.@preserve me begin
+        params = Ref(NVPW_MetricsEvaluator_Destroy_Params(
+            NVPW_MetricsEvaluator_Destroy_Params_STRUCT_SIZE,
+            C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, me)
+        ))
+        NVPW_MetricsEvaluator_Destroy(params)
+    end
+    return nothing
+end
+
+struct MetricsIterator
+    me::MetricsEvaluator
+    type::NVPW_MetricType
+    names::Ptr{Cchar}
+    indices::Ptr{Csize_t}
+    numMetrics::Csize_t
+
+    function MetricsIterator(me, type)
+        GC.@preserve me begin
+            params = Ref(NVPW_MetricsEvaluator_GetMetricNames_Params(
+                NVPW_MetricsEvaluator_GetMetricNames_Params_STRUCT_SIZE,
+                C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, me), type, C_NULL, C_NULL, 0))
+            NVPW_MetricsEvaluator_GetMetricNames(params)
+
+            names = Ptr{Cchar}(params[].pMetricNames)
+            indices = params[].pMetricNameBeginIndices
+
+            return new(me, type, names, indices, params[].numMetrics)
+        end
+    end
+end
+
+Base.length(metrics::MetricsIterator) = metrics.numMetrics
+Base.eltype(::MetricsIterator) = String
+
+function Base.iterate(metrics::MetricsIterator, state=1)
+    if state <= metrics.numMetrics
+        name = unsafe_string(metrics.names + unsafe_load(metrics.indices, state))
+        return (name, state+1)
+    else
+        return nothing
+    end
+end
+
+function list_metrics(me::MetricsEvaluator)
+    for i in 0:(NVPW_METRIC_TYPE__COUNT-1)
+        type = NVPW_MetricType(i)
+
+        for metric in MetricsIterator(me, type)
+            @show metric
+        end
+    end
+end
+
+function submetrics(me::MetricsEvaluator, type)
+    GC.@preserve me begin
+        params = Ref(NVPW_MetricsEvaluator_GetSupportedSubmetrics_Params(
+            NVPW_MetricsEvaluator_GetSupportedSubmetrics_Params_STRUCT_SIZE,
+            C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, me), type, C_NULL, 0))
+        NVPW_MetricsEvaluator_GetSupportedSubmetrics(params)
+        unsafe_wrap(Array, params[].pSupportedSubmetrics, params[].numSupportedSubmetrics)
+    end
+end
+
+# TODO rollup to string
+# TODO submetric to string
+
+# function submetric(m)
+#     if m == NVPW_SUBMETRIC_PEAK_SUSTAINED
+#         return ".peak_sustained"
+#     elseif 
+
+struct Metric
+    me::MetricsEvaluator
+    type::NVPW_MetricType
+    index::Csize_t
+
+    function Metric(me::MetricsEvaluator, name)
+        GC.@preserve me name begin
+            params = Ref(NVPW_MetricsEvaluator_GetMetricTypeAndIndex_Params(
+                NVPW_MetricsEvaluator_GetMetricTypeAndIndex_Params_STRUCT_SIZE,
+                C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, me), pointer(name), 0, 0))
+            NVPW_MetricsEvaluator_GetMetricTypeAndIndex(params)
+            return new(me, NVPW_MetricType(params[].metricType), params[].metricIndex)
+        end
+    end
+end
+
+struct HWUnit
+    me::MetricsEvaluator
+    hwUnit::UInt32
+end
+
+function Base.string(u::HWUnit)
+    GC.@preserve u begin
+        params = Ref(NVPW_MetricsEvaluator_HwUnitToString_Params(
+            NVPW_MetricsEvaluator_HwUnitToString_Params_STRUCT_SIZE,
+            C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, u.me), u.hwUnit,
+            C_NULL))
+        NVPW_MetricsEvaluator_HwUnitToString(params)
+        return unsafe_string(params[].pHwUnitName)
+    end
+end
+
+function properties(m::Metric)
+    if m.type == NVPW_METRIC_TYPE_COUNTER
+        GC.@preserve m begin
+            params = Ref(NVPW_MetricsEvaluator_GetCounterProperties_Params(
+                NVPW_MetricsEvaluator_GetCounterProperties_Params_STRUCT_SIZE,
+                C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, m.me), m.index,
+                C_NULL, 0))
+            NVPW_MetricsEvaluator_GetCounterProperties(params)
+            description = unsafe_string(params[].pDescription)
+            hwUnit = params[].hwUnit
+            return (; description, unit=HWUnit(m.me, hwUnit))
+        end
+    elseif m.type == NVPW_METRIC_TYPE_RATIO
+        GC.@preserve m begin
+            params = Ref(NVPW_MetricsEvaluator_GetRatioMetricProperties_Params(
+                NVPW_MetricsEvaluator_GetRatioMetricProperties_Params_STRUCT_SIZE,
+                C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, m.me), m.index,
+                C_NULL, 0))
+            NVPW_MetricsEvaluator_GetRatioMetricProperties(params)
+            description = unsafe_string(params[].pDescription)
+            hwUnit = params[].hwUnit
+            return (; description, unit=HWUnit(m.me, hwUnit))
+        end
+    else
+        error("Not implemented for $(m.type)")
+    end
+end
+
+struct MetricEvalRequest
+    me::MetricsEvaluator
+    data::NVPW_MetricEvalRequest
+
+    function MetricEvalRequest(me::MetricsEvaluator, name)
+        eval_request = Ref{NVPW_MetricEvalRequest}()
+        GC.@preserve me name eval_request begin
+            params = Ref(NVPW_MetricsEvaluator_ConvertMetricNameToMetricEvalRequest_Params(
+                NVPW_MetricsEvaluator_ConvertMetricNameToMetricEvalRequest_Params_STRUCT_SIZE,
+                C_NULL, Base.unsafe_convert(Ptr{NVPW_MetricsEvaluator}, me), pointer(name),
+                Base.unsafe_convert(Ptr{NVPW_MetricEvalRequest}, eval_request), NVPW_MetricEvalRequest_STRUCT_SIZE))
+            NVPW_MetricsEvaluator_ConvertMetricNameToMetricEvalRequest(params)
+            return new(me, eval_request[])
+        end
+    end
+end