[GitHub] [couchdb-docker] shimaore edited a comment on issue #162: Excessive startup time with large number of databases

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shimaore edited a comment on issue #162: Excessive startup time with large number of databases
URL: https://github.com/apache/couchdb-docker/issues/162#issuecomment-572237882
 
 
   Hi @wohali ,
   
   Sorry, I should have mentioned it. This is a `local` drive mount and the container uses the `overlay2` driver. I'm getting roughly the same performance for the `find` whether I run it inside the container or directly on the machine running Docker.
   
   In my test tonight I wasn't able to reproduce the issue to the same extent. The system spent some time (about 30s) on running
   ```
   chown -f couchdb:couchdb /opt/couchdb /opt/couchdb/bin /opt/couchdb/bin/couchdb /opt/couchdb/bin/remsh /opt/couchdb/bin/couchup /opt/couchdb/bin/couchjs /opt/couchdb/bin/couchdb.cmd /opt/couchdb/erts-8.3.5 /opt/couchdb/erts-8.3.5/include /opt/couchdb/erts-8.3.5/include/erl_driver.h /opt/couchdb/erts-8.3.5/include/internal /opt/couchdb/erts-8.3.5/include/internal/ethr_atomics.h /opt/couchdb/erts-8.3.5/include/internal/ethr_mutex.h /opt/couchdb/erts-8.3.5/include/internal/ethread.mk /opt/couchdb/erts-8.3.5/include/internal/ethread.h /opt/couchdb/erts-8.3.5/include/internal/gcc /opt/couchdb/erts-8.3.5/include/internal/gcc/ethread.h /opt/couchdb/erts-8.3.5/include/internal/gcc/ethr_atomic.h /opt/couchdb/erts-8.3.5/include/internal/gcc/ethr_dw_atomic.h /opt/couchdb/erts-8.3.5/include/internal/gcc/ethr_membar.h /opt/couchdb/erts-8.3.5/include/internal/ppc32 /opt/couchdb/erts-8.3.5/include/internal/ppc32/ethread.h /opt/couchdb/erts-8.3.5/include/internal/ppc32/rwlock.h /opt/couchdb/erts-8.3.5/include/internal/ppc32/ethr_membar.h /opt/couchdb/erts-8.3.5/include/internal/ppc32/spinlock.h /opt/couchdb/erts-8.3.5/include/internal/ppc32/atomic.h /opt/couchdb/erts-8.3.5/include/internal/i386 /opt/couchdb/erts-8.3.5/include/internal/i386/ethread.h /opt/couchdb/erts-8.3.5/include/internal/i386/rwlock.h /opt/couchdb/erts-8.3.5/include/internal/i386/ethr_dw_atomic.h /opt/couchdb/erts-8.3.5/include/internal/i386/ethr_membar.h /opt/couchdb/erts-8.3.5/include/internal/i386/spinlock.h /opt/couchdb/erts-8.3.5/include/internal/i386/atomic.h /opt/couchdb/erts-8.3.5/include/internal/ethread_header_config.h /opt/couchdb/erts-8.3.5/include/internal/win /opt/couchdb/erts-8.3.5/include/internal/win/ethread.h /opt/couchdb/erts-8.3.5/include/internal/win/ethr_event.h /opt/couchdb/erts-8.3.5/include/internal/win/ethr_atomic.h /opt/couchdb/erts-8.3.5/include/internal/win/ethr_dw_atomic.h /opt/couchdb/erts-8.3.5/include/internal/win/ethr_membar.h /opt/couchdb/erts-8.3.5/include/internal/README /opt/couchdb/erts-8.3.5/include/
   ```
   
   This brings two remarks:
   - This is surprising because the [Dockerfile](https://github.com/apache/couchdb-docker/blob/master/2.3.1/Dockerfile#L116) should take care of most of these.
   - Maybe more importantly, when I run the same `chown -f` command manually (using `docker exec …`) once the container has finished starting and is running CouchDB, it doesn't lag for 30s (it clocks at less than 10ms).
   
   So there's definitely some slowness that is due to the fact that Docker is starting the container (maybe caching-related or whatsnot). In that case it might be better to delay the `find` than simply put it in the background.

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