The dcgmGetValuesSince_v2 binding has been added to go-dcgm

Makefile

@@ -43,3 +43,6 @@ clean:
 	rm -f samples/processInfo/processInfo
 	rm -f samples/restApi/restApi
 	rm -f samples/topology/topology
+
+lint:
+	golangci-lint run ./...

go.mod

@@ -12,6 +12,5 @@ require (
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/objx v0.5.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,28 +1,16 @@
 github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
-github.com/bits-and-blooms/bitset v1.2.1 h1:M+/hrU9xlMp7t4TyTDQW97d3tRPVuKFC6zBEK16QnXY=
-github.com/bits-and-blooms/bitset v1.2.1/go.mod h1:gIdJ4wp64HaoK2YrL1Q5/N7Y16edYb8uY+O0FJTyyDA=
 github.com/bits-and-blooms/bitset v1.13.0 h1:bAQ9OPNFYbGHV6Nez0tmNI0RiEu7/hxlYJRUA0wFAVE=
 github.com/bits-and-blooms/bitset v1.13.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
-github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
 github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/dcgm/field_values.go

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dcgm
+
+/*
+#include "dcgm_agent.h"
+#include "dcgm_structs.h"
+#include "field_values_cb.h"
+extern int go_dcgmFieldValueEntityEnumeration(dcgm_field_entity_group_t entityGroupId,
+            dcgm_field_eid_t entityId,
+            dcgmFieldValue_v1 *values,
+            int numValues,
+            void *userData);
+*/
+import "C"
+import (
+	"fmt"
+	"sync"
+	"time"
+	"unsafe"
+)
+
+type callback struct {
+	mu     sync.Mutex
+	Values []FieldValue_v2
+}
+
+func (cb *callback) processValues(entityGroup Field_Entity_Group, entityID uint, cvalues []C.dcgmFieldValue_v1) {
+	values := dcgmFieldValue_v1ToFieldValue_v2(entityGroup, entityID, cvalues)
+	cb.mu.Lock()
+	defer cb.mu.Unlock()
+	cb.Values = append(cb.Values, values...)
+}
+
+//export go_dcgmFieldValueEntityEnumeration
+func go_dcgmFieldValueEntityEnumeration(
+	entityGroup C.dcgm_field_entity_group_t,
+	entityID C.dcgm_field_eid_t,
+	values *C.dcgmFieldValue_v1,
+	numValues C.int,
+	userData unsafe.Pointer) C.int {
+	ptrValues := unsafe.Pointer(values)
+	if ptrValues != nil {
+		valuesSlice := (*[1 << 30]C.dcgmFieldValue_v1)(ptrValues)[0:numValues]
+		if userData != nil {
+			processor := (*callback)(userData)
+			processor.processValues(Field_Entity_Group(entityGroup), uint(entityID), valuesSlice)
+		}
+	}
+	return 0
+}
+
+// GetValuesSince reads and returns field values for a specified group of entities, such as GPUs,
+// that have been updated since a given timestamp. It allows for targeted data retrieval based on time criteria.
+//
+// GPUGroup is a GroupHandle that identifies the group of entities to operate on. It can be obtained from CreateGroup
+// for a specific group of GPUs or use GroupAllGPUs() to target all GPUs.
+//
+// fieldGroup is a FieldHandle representing the group of fields for which data is requested.
+//
+// sinceTime is a time.Time value representing the timestamp from which to request updated values.
+// A zero value (time.Time{}) requests all available data.
+//
+// Returns []FieldValue_v2 slice containing the requested field values, a time.Time indicating the time
+// of the latest data retrieval, and an error if there is any issue during the operation.
+func GetValuesSince(GPUGroup GroupHandle, fieldGroup FieldHandle, sinceTime time.Time) ([]FieldValue_v2, time.Time, error) {
+	var (
+		nextSinceTimestamp C.longlong
+	)
+
+	cbResult := &callback{}
+
+	result := C.dcgmGetValuesSince_v2(handle.handle,
+		GPUGroup.handle,
+		C.dcgmFieldGrp_t(fieldGroup.handle),
+		C.longlong(sinceTime.UnixMicro()),
+		&nextSinceTimestamp,
+		(C.dcgmFieldValueEnumeration_f)(unsafe.Pointer(C.fieldValueEntityCallback)),
+		unsafe.Pointer(cbResult))
+	if result != C.DCGM_ST_OK {
+		return nil, time.Time{}, fmt.Errorf("dcgmGetValuesSince_v2 failed with error code %d", int(result))
+	}
+
+	return cbResult.Values, timestampUSECToTime(int64(nextSinceTimestamp)), nil
+}
+
+func timestampUSECToTime(timestampUSEC int64) time.Time {
+	// Convert microseconds to seconds and nanoseconds
+	sec := timestampUSEC / 1000000           // Convert microseconds to seconds
+	nsec := (timestampUSEC % 1000000) * 1000 // Convert the remaining microseconds to nanoseconds
+	// Use time.Unix to get a time.Time object
+	return time.Unix(sec, nsec)
+}

pkg/dcgm/field_values_cb.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "dcgm_agent.h"
+#include "dcgm_structs.h"
+#include "_cgo_export.h"
+
+int fieldValueEntityCallback(dcgm_field_entity_group_t entityGroupId,
+                                    dcgm_field_eid_t entityId,
+                                    dcgmFieldValue_v1 *values,
+                                    int numValues,
+                                    void *userData) {
+ return go_dcgmFieldValueEntityEnumeration(entityGroupId, entityId, values, numValues, userData);
+}

pkg/dcgm/field_values_cb.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FIELD_VALUES
+#define FIELD_VALUES
+
+#include "dcgm_agent.h"
+#include "dcgm_structs.h"
+
+int fieldValueEntityCallback(dcgm_field_entity_group_t entityGroupId,
+                                      dcgm_field_eid_t entityId,
+                                      dcgmFieldValue_v1 *values,
+                                      int numValues,
+                                      void *userData);
+
+#endif