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  1. JDK
  2. JDK-8318727

Enable parallelism in vmTestbase/vm/gc/concurrent tests

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    • gc
    • b21

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        Similar to JDK-8315937, we want to unblock parallelism for more `hotspot:tier4` tests. `vmTestbase/vm/gc/concurrent` is stressing the GC, but many tests are single-threaded, and all of them are time-bounded. They seem to run similar stress tests that GCBasher does, which runs non-exclusively.

        There are currently 41 tests, each running for about 30 seconds. This totals at about 20 minutes of non-parallelism in tier4.
          CONF=linux-x86_64-server-fastdebug make images test 7315.13s user 314.09s system 584% cpu 21:45.55 total

        We should consider enabling parallelism for them and get improved test performance. Currently it is blocked by `TEST.properties` with `exclusiveAccess.dirs` directives in them.

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                easlan Elif Aslan
                shade Aleksey Shipilev
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