On Tuesday 20 Oct 2015 20:01:16 Jonathan Toomim wrote:
>  claimed that he had this memory usage issue on Linux, but not on Mac OS X,
> under a GBT workload in both situations. If this is true, that would
> suggest this might be a fragmentation issue due to poor memory allocation.

Please make sure you measure your memory usage correctly on Linux, it is 
notoriously easy to get misleading info from tools like top.

I use this one on Linux. 

$cat ~/bin/showmemusage 
#!/bin/sh
if test -z "$1"; then
    echo "need a pid"
    exit
fi

mem=`echo 0 $(cat /proc/$1/smaps | grep Pss | awk '{print $2}' | \
sed 's#^#+#' ) | bc`
echo "$mem KB"