作者emitter ()
看板MATLAB
標題Re: [問題] 關於7.4的multithreading
時間Mon Oct 22 18:39:46 2007
我的CPU是INTEL P4 2.8CG with HT
matlab7.4中multithreading開啟後會抓到兩個core
我用catherinejoy版友的小程式計時了一下
1 core
Elapsed time is 68.530766 seconds.
Elapsed time is 3.432436 seconds.
Elapsed time is 0.211274 seconds.
Elapsed time is 9.084159 seconds.
Elapsed time is 6.800764 seconds.
2 cores
Elapsed time is 88.174566 seconds.
Elapsed time is 4.598900 seconds.
Elapsed time is 0.213690 seconds.
Elapsed time is 11.354454 seconds.
Elapsed time is 8.945655 seconds.
看來只有HT的舊P4應該是選1？
%% 唉 想換個C2D來玩看看
※ 引述《emitter ()》之銘言：
: 根據Matlab help上說的
: Accepting the Automatic option is recommended—MATLAB
: automatically sets the value to the actual number of computational cores on
: your system. Note that if your system uses hyperthreading (where one
: processor is logically configured as two), MATLAB
: sets the value to 1.
: 我的CPU是P4 2.8CG with HT
: 並非真實的雙核心
: 按照文件上說的應該是選了自動後他會設定為1
: 不過我看了一下他還是自動定為2
: 還是我誤解文件的意思？
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◆ From: 140.113.144.250
1F：→ emitter:關往建議我關掉此功能.... 10/23 01:29
2F：→ emitter:看來只支援實體雙核心或是多核心的CPU了 10/23 01:30
3F：→ emitter:官網說在HT下偵測到兩個processor是個bug 10/23 02:17
4F：→ emitter:這個問題在R2007b被修正了 @@ 10/23 02:17