2作者: hallole21 天前原帖
我更想谈的是你所获得的教育价值。如今,大学越来越被认为像工厂一样运作:对讲师质量的关注减少,而对招生人数的增加则更加重视,即使这意味着降低标准。你所获得的知识在多大程度上对你真正有价值?你是否为进入自己的领域做好了充分准备?你觉得你的学位是否仅仅是向雇主证明你不是个完全无能的人? 我认为这大致上是值得的。一些高级课程的质量参差不齐,部分教师的能力也令人怀疑。但我确实学到了足够的知识,可以应用于我选择的领域。
2作者: user_timo21 天前原帖
我开发了一款针对Apple Silicon macOS的开源命令行工具。它以不同的方式测量内存速度和延迟。在M4基础上,它的读取速度效率可达到96-97%,而官方宣传的速度为120GB/s。所有内存操作均采用汇编语言实现。 我非常希望能获得不同CPU上的基准测试结果,看看它们的表现。我已经在M1和M4上进行了测试。 命令:`memory_benchmark -non-cacheable -count 5 -output results.JSON` (运行前请关闭所有应用程序) 这将生成一个JSON文件,其中包含copy_gb_s、read_gb_s和write_gb_s的统计数据。 以下是M4在10次循环下的示例结果: ```json "copy_gb_s": { "statistics": { "average": 106.65421233311835, "max": 106.70240696071005, "median": 106.65069297260811, "min": 106.6336774994254, "p90": 106.66606919223108, "p95": 106.68423807647056, "p99": 106.69877318386216, "stddev": 0.01930653530818627 }, "values": [ 106.70240696071005, 106.66203166240008, 106.64410802226159, 106.65831409449595, 106.64148106986977, 106.6482935780762, 106.63974821679058, 106.65896986001393, 106.6336774994254, 106.65309236714002 ] }, "read_gb_s": { "statistics": { "average": 115.83111228356601, "max": 116.11098114619033, "median": 115.84480882265643, "min": 115.56959026587722, "p90": 115.99667266786554, "p95": 116.05382690702793, "p99": 116.09955029835784, "stddev": 0.1768243167963439 }, "values": [ 115.79154681380165, 115.56959026587722, 115.60574235736468, 115.72112860271632, 115.72147129262802, 115.89807083151123, 115.95527337086908, 115.95334642887214, 115.98397172582945, 116.11098114619033 ] }, "write_gb_s": { "statistics": { "average": 65.55966046805113, "max": 65.59040040480241, "median": 65.55933583741347, "min": 65.50911885624045, "p90": 65.5840272860955, "p95": 65.58721384544896, "p99": 65.58976309293172, "stddev": 0.02388146120866979 } } ``` 模式基准测试也显示了更多的内存速度。命令:`memory_benchmark -patterns -non-cacheable -count 5 -output patterns.JSON` 以下是M4在100次循环下的示例结果: ```json "sequential_forward": { "bandwidth": { "read_gb_s": { "statistics": { "average": 116.38363691482549, "max": 116.61212708384109, "median": 116.41264548721367, "min": 115.449510036971, "p90": 116.54143114134801, "p95": 116.57314206456576, "p99": 116.60095068065866, "stddev": 0.17026641589059727 } } } }, "strided_4096": { "bandwidth": { "read_gb_s": { "statistics": { "average": 26.460392735220456, "max": 27.7722419653915, "median": 26.457051473208285, "min": 25.519925729459107, "p90": 27.105171215736604, "p95": 27.190715938337473, "p99": 27.360449534513144, "stddev": 0.4730857335572576 } } } }, "random": { "bandwidth": { "read_gb_s": { "statistics": { "average": 26.71367836895143, "max": 26.966820487564327, "median": 26.69907406197067, "min": 26.49374804466308, "p90": 26.845236287807374, "p95": 26.882004355057887, "p99": 26.95742242818151, "stddev": 0.09600564296001704 } } } } ``` 感谢您的阅读 :)