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服务器性能问题一般有两种：　　高内存占用、高CPU占用，比如应用程序高内存占用，可能是因为文件读写、频繁的IO、内存频繁GC，进一步占用了内存和CPU；比如应用程序高CPU占用，可能是因为大任务计算、死循环、卡死、不断超时或者重试。所以需要

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