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[improvement](memory) simplify memory config related to tcmalloc and …
…add gc (apache#1191) (apache#1193) * [improvement](memory) simplify memory config related to tcmalloc There are several configs related to tcmalloc, users do know how to config them. Actually users just want two modes, performance or compact, in performance mode, users want doris run query and load quickly while in compact mode, users want doris run with less memory usage. If we want to config tcmalloc individually, we can use env variables which are supported by tcmalloc. * [improvement](tcmalloc) add moderate mode and avoid oom with a lot of cache (apache#14374) ReleaseToSystem aggressively when there are little free memory.
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