To read

https://wiki.archlinux.org/title/CPU_frequency_scaling

https://www.intel.com/content/www/us/en/developer/tools/software-catalog/overview.html

Intel(R) Memory Latency Checker

https://www.intel.com/content/www/us/en/download/736633/intel-memory-latency-checker-intel-mlc.html

wget https://downloadmirror.intel.com/866182/mlc_v3.12.tgz
tar xvf mlc_v3.12.tgz
Linux/mlc


Intel(R) Memory Latency Checker - v3.12
Measuring idle latencies for sequential access (in ns)...
                Numa node
Numa node            0
       0         144.6

Measuring Peak Injection Memory Bandwidths for the system
Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
Using all the threads from each core if Hyper-threading is enabled
Using traffic with the following read-write ratios
ALL Reads        :       78800.3
3:1 Reads-Writes :       75003.3
2:1 Reads-Writes :       74966.8
1:1 Reads-Writes :       75022.1
Stream-triad like:       73826.4
All NT writes    :       75829.9
1:1 Read-NT write:       73326.7

Measuring Memory Bandwidths between nodes within system
Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
Using all the threads from each core if Hyper-threading is enabled
Using Read-only traffic type
                Numa node
Numa node              0
       0         78808.7

Measuring Loaded Latencies for the system
Using all the threads from each core if Hyper-threading is enabled
Using Read-only traffic type
Inject  Latency Bandwidth
Delay   (ns)    MB/sec
==========================
 00000  276.72   78936.0
 00002  277.12   78964.9
 00008  276.93   78941.1
 00015  243.31   78397.2
 00050  204.42   75714.7
 00100  190.78   73233.4
 00200  156.82   55748.6
 00300  150.16   39532.8
 00400  147.61   30830.6
 00500  144.69   25592.8
 00700  141.62   19131.0
 01000  139.33   13930.3
 01300  138.64   11016.4
 01700  137.85    8644.1
 02500  137.44    6104.8
 03500  137.59    4530.3
 05000  137.64    3331.4
 09000  138.39    2066.9
 20000  139.72    1183.6

Measuring cache-to-cache transfer latency (in ns)...
Local Socket L2->L2 HIT  latency        37.5
Local Socket L2->L2 HITM latency        39.6




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