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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: 3.2.8
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Component/s: Internal Code
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None
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ALL
config:
wiredTiger Cache size : 2GB
max connections: 3000
mongod Version: 3.2.8
total dataset size: 16GB
how to find this question:
we set max connections as 3000, so when connections reach to 3000, we received sms warning. login to server, found that: this mongod use 39GB physical memory, as follows:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 13154 mongod 20 0 46.9g 39g 9240 S 2.0 62.0 3815:20 mongod
connecto to mongod , seeing from serverStatus:
"generic" : { "current_allocated_bytes" : NumberLong("11833558352"), "heap_size" : NumberLong("48540131328") }, "tcmalloc" : { "pageheap_free_bytes" : NumberLong("31037857792"), "pageheap_unmapped_bytes" : NumberLong("5174722560"), "max_total_thread_cache_bytes" : NumberLong(1073741824), "current_total_thread_cache_bytes" : 384155856, "central_cache_free_bytes" : 90345984, "transfer_cache_free_bytes" : 19490784, "thread_cache_free_bytes" : 384155856, "aggressive_memory_decommit" : 0 }
but, pageheap_free_bytes not be released.
Once the connecitons increases, the memory use increases too.
monitor data from my data collector:
