メモリの転送速度測定ツール もともとは、solarisやlinuxでのコマンドプログラム。 ダウンロードファイルと別にcygwin1.dllも必要。 stream.exeとcygwin1.dllを同一のフォルダに配置、cmdより実行。 動作確認 ・Windows Server 2008 32bit C:\Users\Administrator>c:\tmp\stream.exe-------------------------------------------------------------STREAM version $Revision: 5.8 $-------------------------------------------------------------This system uses 8 bytes per DOUBLE PRECISION word.-------------------------------------------------------------Array size = 2000000, Offset = 0Total memory required = 45.8 MB.Each test is run 10 times, but onlythe *best* time for each is used.-------------------------------------------------------------Printing one line per active thread....-------------------------------------------------------------Your clock granularity/precision appears to be 999 microseconds.Each test below will take on the order of 5999 microseconds. (= 6 clock ticks)Increase the size of the arrays if this shows thatyou are not getting at least 20 clock ticks per test.-------------------------------------------------------------WARNING -- The above is only a rough guideline.For best results, please be sure you know theprecision of your system timer.-------------------------------------------------------------Function Rate (MB/s) Avg time Min time Max timeCopy: 3200.0319 0.0100 0.0100 0.0100Scale: 3555.5527 0.0102 0.0090 0.0130Add: 3692.3306 0.0134 0.0130 0.0140Triad: 3692.3268 0.0132 0.0130 0.0140-------------------------------------------------------------Solution Validates-------------------------------------------------------------実際、ディスクの転送速度とメモリの転送速度を比較すると、一桁は変わることが分かる。 |