Object-cache: enforce cache size to be less than RAM. (#2338)

pkg/sys/stats_darwin.go

@@ -0,0 +1,51 @@
+// +build darwin
+
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * 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 sys
+
+import (
+	"encoding/binary"
+	"syscall"
+)
+
+func getHwMemsize() (uint64, error) {
+	totalString, err := syscall.Sysctl("hw.memsize")
+	if err != nil {
+		return 0, err
+	}
+
+	// syscall.sysctl() helpfully assumes the result is a null-terminated string and
+	// removes the last byte of the result if it's 0 :/
+	totalString += "\x00"
+
+	total := uint64(binary.LittleEndian.Uint64([]byte(totalString)))
+
+	return total, nil
+}
+
+// GetStats - return system statistics for windows.
+func GetStats() (stats Stats, err error) {
+	memSize, err := getHwMemsize()
+	if err != nil {
+		return Stats{}, err
+	}
+	stats = Stats{
+		TotalRAM: memSize,
+	}
+	return stats, nil
+}