java - 更改 ThreadPriorityPolicy 范围

Question

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Can't start Cassandra (Single-Node Cluster on CentOS7) [duplicate] (2 个回答)

Cassandra and Java 9 - ThreadPriorityPolicy=42 is outside the allowed range (7 个回答)

已关闭 5 年前。

我有一个遗留应用程序，它在 Java 8 JVM 中启动，参数如下:

-XX:ThreadPriorityPolicy=42 

我正在尝试在 Java 10 JVM 中运行相同的应用程序。但是，启动时遇到错误:

intx ThreadPriorityPolicy=42 is outside the allowed range [ 0 ... 1 ]
Improperly specified VM option 'ThreadPriorityPolicy=42'

这可能是由于 JVM 实现发生了变化，迁移到了 HotSpot JVM 的更高版本。我发现了许多有关 Cassandra 和此问题的问题，但我找不到任何文档/问题跟踪来记录 JVM 中的此更改。有什么地方可以读到这方面的内容吗？

此参数可能是出于正当原因添加到旧应用程序中的。在 Java 10 中我应该如何最好地处理这个问题？将值设置为 1 ？省略参数？

Answer 1

不知道它是否对您有帮助，但以下是来源的描述:

 "0 : Normal.                                                          "\
      "    VM chooses priorities that are appropriate for normal       "\
      "    applications. On Solaris NORM_PRIORITY and above are mapped "\
      "    to normal native priority. Java priorities below "           \
      "    NORM_PRIORITY map to lower native priority values. On       "\
      "    Windows applications are allowed to use higher native       "\
      "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
      "    not use the highest possible native priority,               "\
      "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
      "    system threads. On Linux thread priorities are ignored      "\
      "    because the OS does not support static priority in          "\
      "    SCHED_OTHER scheduling class which is the only choice for   "\
      "    non-root, non-realtime applications.                        "\
 "1 : Aggressive.                                                 "\
      "    Java thread priorities map over to the entire range of      "\
      "    native thread priorities. Higher Java thread priorities map "\
      "    to higher native thread priorities. This policy should be   "\
      "    used with care, as sometimes it can cause performance       "\
      "    degradation in the application and/or the entire system. On "\
      "    Linux this policy requires root privilege.")