内存带宽时延测试
STREAM：MEMORY BANDWIDTH: STREAM BENCHMARK PERFORMANCE RESULTS (virginia.edu)
STREAM 测试得到的是可持续运行的内存带宽最大值，而并不是一般的硬件厂商提供的理论最大值。
dmidecode is a free userspace command-line utility for Linux that can parse the SMBIOS data.
In dmidecode’s output for memory, “Speed” is the highest speed supported by the DIMM, as determined by JEDEC SPD information. “Configured Clock Speed” is the speed at which it is currently running (as set up during boot).
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