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  1. Couchbase Server
  2. MB-11434

600-800% CPU consumption by memcached on source cluster.

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Details

    • Bug
    • Resolution: Duplicate
    • Critical
    • 3.0-Beta, 3.0
    • 3.0
    • couchbase-bucket
    • Security Level: Public
    • Platform = Physical
      OS = CentOS 6.5
      CPU = Intel Xeon E5-2680 v2 (40 vCPU)
      Memory = 256 GB
      Disk = RAID 10 SSD

    Description

      In XDCR scenarios, the CPU usage for memcached process is more than two times the usage in the previous release. This is due to increased scheduling overhead from the shared thread pool.
      Workaround: Reduce the number of threads on systems that have more than 30 cores.

      5 -> 5 UniDir, 2 buckets x 500M x 1KB, 10K SETs/sec/node, LAN

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MB-11435 1500-2000% CPU utilization by beam.smp on source nodes in XDCR scenarios (was ~500% in 2.5.x)

          • Critical - Crashes, loss of data, severe memory leak.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MB-11405 Shared thread pool: high CPU overhead due to OS level context switches / scheduling

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Task - A task that needs to be done. MB-11738 Evaluate GIO CPU utilization on systems with 8/16 vCPU

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
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              sundar Sundar Sridharan (Inactive)
              pavelpaulau Pavel Paulau (Inactive)
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              Dates

                Created:
                Updated:
                Resolved:

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