vdiravka commented on pull request #2301:
URL: https://github.com/apache/drill/pull/2301#issuecomment-908047858


   @ChenZhangg we have already use parallel builds. And this 2 forks right now:
   https://github.com/apache/drill/blob/master/pom.xml#L52
   On the other hand, this is the issue, that some test fails intermittently 
right now for parallel maven builds. I am going to solve it in scope of: 
https://github.com/apache/drill/pull/2293
   
   
   About `-T 1C`, it means to use the same number of forks as the number of 
cores on machine. But it also means we will use the same number of JVMs and the 
memory usage will be increased. Since Drill is memory cost tool and not all 
machines has enough amount of memory this option is not sufficient for all 
machines. For instance: user can have laptop with two physical cores, but with 
Intel multi-threading that number will be 4. The default memory usage for Drill 
in scope of one JVM is up to 4Gb. So for laptops with 8Gb memory the build will 
fail.


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