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blog/2023: Fix Reddit Challange Cycles/OP numbers. #599

Closed markhpc closed 1 year ago

markhpc commented 1 year ago

Double checked the corrected numbers and ran them through a verification process using the collectl ceph-osd CPU usage metrics and FIO reported IOPS:

1 Client

Method 1  
Total Cycles as reported by perf for all OSD Processes 44266803673837
Total OPs as reported by FIO 39321600
Cycles/OP 1125763.033
Method 2  
Average OSD Core Usage as report by Collectl 3.27
Approximate Cycles/Second (12 OSDs at 3.04GHz) 119289600000
Total OPs as reported by FIO: 123774
Approximate Cycles/OP 963769.4508
Difference 16.81%

16 Client

Method 1  
Total Cycles as reported by perf for all OSD Processes 44561005213700
Total OPs as reported by FIO: 67108864
Cycles/OP 664010.7216
Method 2  
Average OSD Core Usage as report by Collectl 11.63
Approximate Cycles/Second (12 OSDs at 3.04GHz) 424262400000
Total OPs as reported by FIO 726096
Approximate Cycles/OP 584306.2074
Difference 13.64%