FPS、メモリ使用量等を画面に表示するスクリプト（訂正版）。

ProfileStats.cs

using UnityEngine;
using UnityEngine.Profiling;
using System.Collections;
using System.Text;
using System.Linq;

[ExecuteInEditMode()]
//=====================================================================================
//=====================================================================================
// class ProfileStats
//=====================================================================================
public class ProfileStats : MonoBehaviour
{
    //-------------------------------------------------------------------------------------
    //-------------------------------------------------------------------------------------
    // constant
    //-------------------------------------------------------------------------------------
    public const int    SIZE_MB = 1024 * 1024;

    //-------------------------------------------------------------------------------------
    // Start
    //-------------------------------------------------------------------------------------
    void Start()
    {
        useGUILayout    = false;
        m_SlicedTimer   = 0.50f;
    }
    //-------------------------------------------------------------------------------------
    // OnGUI
    //-------------------------------------------------------------------------------------
    void OnGUI()
    {
        // profile
        profileStats();
        // draw
        if( m_IsShow ){
            if( Application.isPlaying ){
                drawStats();
            }else{
                if( m_IsShowEditor ){
                    drawStats();
                }
            }
        }
    }

    //-------------------------------------------------------------------------------------
    // profile stats
    //-------------------------------------------------------------------------------------
    private void    profileStats()
    {
        // check GC
        int collCount = System.GC.CollectionCount( 0 );
        if( m_LastCollectNum != collCount )
        {
            m_LastCollectNum        = collCount;
            m_CollectDeltaTime      = Time.realtimeSinceStartup - m_LastCollectTime;
            m_LastCollectTime       = Time.realtimeSinceStartup;
            m_LastCollectDeltaTime  = Time.deltaTime;
            m_CollectMemSize        = m_UsedMemSize;
        }

        // check memory
        m_UsedMemSize = System.GC.GetTotalMemory( false );  // byte
        if( m_UsedMemSize > m_MaxUsedMemSize ){
            m_MaxUsedMemSize = m_UsedMemSize;
        }

        // calc alloc rate
        if( (Time.realtimeSinceStartup - m_LastAllocSet) > 0.3f )
        {
            long diff = m_UsedMemSize - m_LastAllocMemSize;

            m_LastAllocMemSize  = m_UsedMemSize;
            m_LastAllocSet      = Time.realtimeSinceStartup;

            if( diff >= 0 ){
                m_AllocRate = diff;
            }
        }

        // FPS
        m_StrFPS = (1f / Time.deltaTime).ToString("0.000");

        // stok sliced FPS
        m_SlicedTimer -= Time.deltaTime;
        if( m_SlicedTimer < 0.0f )
        {
            m_SlicedTimer   = 0.50f;
            m_StrSlicedFPS  = m_StrFPS;
        }
    }
    //-------------------------------------------------------------------------------------
    // draw stats
    //-------------------------------------------------------------------------------------
    private void    drawStats()
    {
        string left_text    = "";
        string right_text   = "";

        // FPS
        string str_fps = string.Format( "{0} FPS ({1})\n", m_StrFPS, m_StrSlicedFPS );

        // Base
        string str_membase = "";
        str_membase += "Used\nMax Used\nUsed Heap(Unity)\nMono Used\nMono Heap\n";
        string str_membase_val = "";
        str_membase_val = string.Format(
            "{0} MB\n{1} MB\n{2} MB\n{3} MB\n{4} MB\n",
            ((float)m_UsedMemSize / SIZE_MB).ToString("0.00"),
            ((float)m_MaxUsedMemSize / SIZE_MB).ToString("0.00"),
            ((float)Profiler.usedHeapSize / SIZE_MB).ToString("0.00"),
            ((float)Profiler.GetMonoUsedSize() / SIZE_MB).ToString("0.00"),
            ((float)Profiler.GetMonoHeapSize() / SIZE_MB).ToString("0.00")
        );

        // Sub
        string str_memsub       = "";
        string str_memsub_val   = "";
        if( m_IsShowSubMemory ){
            str_memsub += "Total Alloc\n Unused-Reserved\n Reserved\n";
            str_memsub_val = string.Format(
                "{0} MB\n{1} MB\n{2} MB\n",
                ((float)Profiler.GetTotalAllocatedMemory() / SIZE_MB).ToString("0.00"),
                ((float)Profiler.GetTotalUnusedReservedMemory() / SIZE_MB).ToString("0.00"),
                ((float)Profiler.GetTotalReservedMemory() / SIZE_MB).ToString("0.00")
            );
        }

        // for GC
        string str_gc       = "";
        string str_gc_val   = "";
        if( m_IsShowGC ){
            str_gc += "Allocation Rate\n LastCollectionDelta\n Collection Freq\n";
            str_gc_val = string.Format(
                "{0} MB\n{1} s ({2} fps)\n{3} s\n",
                ((float)m_AllocRate / SIZE_MB).ToString ("0.00"),
                m_LastCollectDeltaTime.ToString("0.000"),
                (1f / m_LastCollectDeltaTime).ToString("0.0"),
                m_CollectDeltaTime.ToString("0.00")
            );
        }

        // System
        string str_sys      = "";
        string str_sys_val  = "";
        if( m_IsShowSystem ){
            str_sys += "Graphic\nSystem\n";
            str_sys_val = string.Format(
                "{0} MB\n{1} MB\n",
                SystemInfo.graphicsMemorySize.ToString(),
                SystemInfo.systemMemorySize.ToString()
            );
        }

        // cat string
        left_text   = string.Format( "{0}{1}{2}{3}{4}", str_fps, str_membase, str_memsub, str_gc, str_sys );
        right_text  = string.Format( "\n{0}{1}{2}{3}", str_membase_val, str_memsub_val, str_gc_val, str_sys_val );

        // draw background box
        int lineCount = left_text.ToList().Where(c => c.Equals('\n')).Count();
        GUI.Box( new Rect(5,5,270,(int)(m_FontSizeBase * lineCount) + 5), "" );

        // draw left label
        GUI.Label( new Rect(10,5,Screen.width,Screen.height), left_text.ToString() );
        // draw right label
        GUI.Label( new Rect(160,5,Screen.width,Screen.height), right_text.ToString() );
    }

    //=====================================================================================
    // member
    //=====================================================================================
    public bool         m_IsShow                = true;
    public bool         m_IsShowSubMemory       = false;
    public bool         m_IsShowGC              = false;
    public bool         m_IsShowSystem          = false;
    public bool         m_IsShowEditor          = false;
    public float        m_FontSizeBase          = 15.175f;
    private long        m_UsedMemSize;
    private long        m_MaxUsedMemSize;
    private long        m_CollectMemSize;
    private float       m_LastCollectTime;
    private float       m_LastCollectNum;
    private float       m_CollectDeltaTime;
    private float       m_LastCollectDeltaTime;
    private long        m_AllocRate;
    private long        m_LastAllocMemSize;
    private float       m_LastAllocSet          = -9999.0f;
    private string      m_StrFPS                = "0.000";
    private string      m_StrSlicedFPS          = "0.000";
    private float       m_SlicedTimer;
}