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[困惑]matlab并行计算

2012/9/14镜像同步2 回复

试图配置matlab下的并行计算，试验时出了问题：双核的cpu，配置2个lab之后，运行速度反而变慢了，且屡试不爽。。运行结果： >> TestParfor Starting matlabpool using the 'local' profile ... connected to 2 labs. Elapsed time is 9.832358 seconds. Sending a stop signal to all the labs ... stopped. >> TestFor Elapsed time is 0.063337 seconds. 以下是两个测试程序： % TestParfor runtimes = 1e7; dummy1 = 0; dummy2 = 0; matlabpool local 2 tic parfor x = 1:runtimes dummy1 = dummy1 + x; dummy2 = 2 * x + 1; end toc matlabpool close % TestFor.m runtimes = 1e7; dummy1 = 0; dummy2 = 0; tic for x = 1:runtimes dummy1 = dummy1 + x; dummy2 = 2 * x + 1; end toc matlab版本：7.14.0.739 (R2012a) 以下是cpu信息： $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Pentium(R) Dual-Core CPU E5400 stepping : 10 microcode : 0xa07 cpu MHz : 2700.063 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 appi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constanerf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtority bogomips : 5402.13 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Pentium(R) Dual-Core CPU E5400 stepping : 10 microcode : 0xa07 cpu MHz : 2700.063 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 5402.13 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: 参考的资料：http://wenku.baidu.com/view/36ed0e7a31b765ce050814fa.html 请路过大牛解答，谢谢！

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