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  1. Couchbase Server
  2. MB-38609

Very poor performance in Collections test with Magma (cf couchstore) under TSan

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    Description

      When running CollectionsEraserTest.basic_2_collections full_eviction under TSan, the Magma variant is over 100x slower than the couchstore variant.

      Couchstore

      [ RUN      ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistent_full_eviction
      		 
      [       OK ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistent_full_eviction (227 ms)

      Magma

      [ RUN      ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistentMagma_full_eviction
      		 
      [       OK ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistentMagma_full_eviction (47721 ms)

      This results in hitting the 120s overall test suite timeout.

      Full log: http://cv.jenkins.couchbase.com/job/kv_engine.threadsanitizer/job/master/3008/testReport/junit/(root)/projectroot/ep_engine_ep_unit_tests_CollectionsEraserTests_CollectionsEraserTest/

      Note this test triggers an explicit compaction to ensure collections are erased.

      (The value-only ones are also slower, but "only" ~60x slower

      [ RUN      ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistent_value_only
      		 
      [       OK ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistent_value_only (197 ms)
      		 
      [ RUN      ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistentMagma_value_only
      		 
      [       OK ] CollectionsEraserTests/CollectionsEraserTest.basic_2_collections/persistentMagma_value_only (11643 ms)

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            scott.lashley Scott Lashley
            drigby Dave Rigby (Inactive)
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