Elasticsearch 2.3.2 There is insufficient memory for the Java Runtime Environment to continue

Elastic Stack Elasticsearch
1

When I try to start Elasticsearch 2.3.2 using the command ./bin/elasticsearch, I get the following error message:

 Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000414cc0000, 15757213696, 0) failed; error='Cannot allocate memory' (errno=12)
 #
 # There is insufficient memory for the Java Runtime Environment to continue.
 # Native memory allocation (mmap) failed to map 15757213696 bytes for committing reserved memory.
 # An error report file with more information is saved as:
 # /tmp/hs_err_pid17799.log

So I try to use the following command, but with the same result:

./bin/elasticsearch -Xmx6g -Xms6g

The following is my system stats

%Cpu(s):  0.1 us,  0.1 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:  15400936 total,  3625164 used, 11775772 free,   319024 buffers
KiB Swap:        0 total,        0 used,        0 free.  1804888 cached Mem

So according to that, Elasticsearch should run fine, right?

What other settings should I set?

2

What does that error file it refers to have in it?

ES should only use 1GB of heap at max if you don't specify a limit.