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Posted to commits@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/11/22 13:11:18 UTC
[GitHub] [rocketmq] jianglianggithub opened a new issue, #5571: MappedFile#warmMappedFile there may be code that doesn't work
jianglianggithub opened a new issue, #5571:
URL: https://github.com/apache/rocketmq/issues/5571
文件预热
1.会给每个page 写入一个假值0
2.然后使用mlock来让liunx不回收对应的物理内存
3. madvise 让系统先读取一些数据出来
这里有个问题 如果1只是为了预先读取一些数据出来避免后续出现缺页中断的话，mlock本身就会触发缺页中断处理了
如果不是的话就是之所以put是因为mlock可能不生效有些页是cow的，但是在创建内存映射mmap的时候指定了 MapMode.READ_WRITE
在这个mode下是不会发生cow的所以我觉得这个for 循环put 一个假值好像是没啥用的 因为在这个mode下 先put一个假值好像没意义
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[GitHub] [rocketmq] jianglianggithub commented on issue #5571: MappedFile#warmMappedFile there may be code that doesn't work
Posted by "jianglianggithub (via GitHub)" <gi...@apache.org>.
jianglianggithub commented on issue #5571:
URL: https://github.com/apache/rocketmq/issues/5571#issuecomment-1491624708
@Oliverwqcwrw 您好过去很久了，我看到ISSUE 4902 里面说了一些相关的东西，比如红帽的文档那个链接 看了下貌似没解决我得疑问，
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Re: [I] MappedFile#warmMappedFile there may be code that doesn't work [rocketmq]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #5571:
URL: https://github.com/apache/rocketmq/issues/5571#issuecomment-2028503974
This issue is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs.
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Re: [I] MappedFile#warmMappedFile there may be code that doesn't work [rocketmq]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #5571: MappedFile#warmMappedFile there may be code that doesn't work
URL: https://github.com/apache/rocketmq/issues/5571
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[GitHub] [rocketmq] Oliverwqcwrw commented on issue #5571: MappedFile#warmMappedFile there may be code that doesn't work
Posted by "Oliverwqcwrw (via GitHub)" <gi...@apache.org>.
Oliverwqcwrw commented on issue #5571:
URL: https://github.com/apache/rocketmq/issues/5571#issuecomment-1491697584
@jianglianggithub 我的理解是mlock在锁定内存的时候，操作系统会确保物理内存足够来容纳这个区域，因此在使用mlock时，不会触发缺页中断。但如果内存不足，操作系统将无法保证所有被mlock锁定的内存都可以驻留在物理内存中，这时会出现一定的概率触发缺页中断。
所以我觉得这块预热是OK的
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Re: [I] MappedFile#warmMappedFile there may be code that doesn't work [rocketmq]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #5571:
URL: https://github.com/apache/rocketmq/issues/5571#issuecomment-2035832969
This issue was closed because it has been inactive for 3 days since being marked as stale.
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