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Asked: 2026-06-18T05:53:12+00:00

I am observing the connection of mongoDB. when a new connction generated, I can

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I am observing the connection of mongoDB. when a new connction generated, I can see a new thread created ( pstack ·pgrep monnod| grep -c Thread), and some new chunks memory allocated (get from /proc/pgrep mongod`/maps), one of the chunk is 1024K, which should be the stack size for the new thread, I saw it was set to 1024k in the code.
when I exited this session, the No. of threads decrease by 1, but the memory still there. when I generate a new connection, these memory seems reused. so I guess it should be the behavior of linux Kernel.
Can I konw if I am right? and where is this feature well documented?
thanks for your help!

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1 Answer

  1. Editorial Team

    when I exited this session, the No. of threads decrease by 1, but the memory still there. when I generate a new connection, these memory seems reused. so I guess it should be the behavior of linux Kernel.

    This has nothing to do with the kernel.

    GLIBC will mmap thread stack, and has a cache of such stacks. The code is here.

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