leezu commented on issue #18501:
URL: 
https://github.com/apache/incubator-mxnet/issues/18501#issuecomment-643385571


   Single process build of MXNet master with gcc7 gives the following results:
   
   ```
   Child user: 5288.372 s
   Child sys :  188.645 s
   Child wall: 5481.062 s
   Child high-water RSS                    :    2504976 KiB
   Recursive and acc. high-water RSS+CACHE :    2674692 KiB
   ```
   
   That's a 24% increase to 1.7, but less than 3GB high-water. So I don't think 
we have any blocking issue here. @wkcn I suggest you reduce the number of 
parallel builds to stay under 16GB. Also recommend to use `ccache` to avoid 
rebuilding.


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