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galaxy 在创建task时,会多给任务加50M内存,以便在不触发cgroup oom前让galaxy killer把 task kill 掉。
galaxy agent会 200毫秒检查一下任务使用内存(rss + page cache),采集还是使用 cgroup里面的memory.stat, 如果内存使用mem_used + 50m >= 任务设置的limit 会触发galaxy killer ,然后任务重启