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understand workloads - Coggle Diagram

- - - - 48 threads
    - - %util < 10 for each thread
  - - - Device r/s w/s rkB/s wkB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
        sda 67.00 728.00 268.00 1604.00 0.00 2.00 0.00 0.27 0.19 2.39 1.75 4.00 2.20 1.25 99.50
      - direct io
      - write
        
        libaio
        
        multiple threads
        
        io_submit
        
        batch
        
        io_getevents()
        
        batch
        
        semtimedop
        
        files
        
        .LRG
        
        C0000000.LRG
        
        big file: 10GB
        
        2 or 3 extents
        
        lots of READ for this file
        
        .CAT
        
        pwrite
        
        two threads
        
        S000000*.LOG
        
        1extent
        
        SQLOGCTL.LFH
        
        1 extent
        
        12M, 32M
        
        meta/io: 1.58%
        
        pread
        
        C0000000.LRG
        
        big one
        
        almost single pthread
        
        read much more than write