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Memory benchmark #417

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Memory benchmark #417

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Commits on Jun 10, 2021

  1. memory benchmark: support auto-detect CPU L3 cache 

    During writing to a small memory block, the CPU just writes to L3
cache. So use a memory block size larger than L3 cache size should be
better. Allow to specify --memory-block-size=0, then sysbench
auto-detect CPU L3 cache size and alignup to power of 2 to do test
work.

For example:
Orignally, run this command on my PC and got a result 47634.81 MiB/sec
 # sysbench memory --memory-scope=local --threads=12 run

In face, the real performance is about 15G/s. The test result gets
about 300% deviation.

A test case should be added in test_memory.t, but the github CI failed.
I tried to reproduce on an ARM server, but this still work well. Maybe
this test case could be added in the future.

  $ sysbench memory --memory-scope=local --memory-oper=write --memory-total-size=1G --memory-block-size=0 --events=1 --time=0 --threads=2 run
  sysbench *.* * (glob)

  Running the test with following options:
  Number of threads: 2
  Initializing random number generator from current time

  Running memory speed test with the following options:
    block size: * (glob)
    total size: 1024MiB
    operation: write
    scope: local

  Initializing worker threads...

  Threads started!

  Total operations: * (* per second) (glob)

  1024.00 MiB transferred (* MiB/sec) (glob)

  Throughput:
      events/s (eps): * (glob)
      time elapsed:                        *s (glob)
      total number of events:              * (glob)

  Latency (ms):
           min:                              *.* (glob)
           avg:                              *.* (glob)
           max:                              *.* (glob)
           95th percentile:         *.* (glob)
           sum: *.* (glob)

  Threads fairness:
      events (avg/stddev):           */* (glob)
      execution time (avg/stddev):   */* (glob)

  $ sysbench $args cleanup
  sysbench *.* * (glob)

Signed-off-by: zhenwei pi <[email protected]>
    @pizhenwei
    pizhenwei committed Jun 10, 2021
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