Cassandra 3.11.3 and RHEL 7 compatibility - cassandra

Question

Am trying to run Cassandra v3.11.3 on RHEL 7 system.
But facing memory errors while trying to start Cassandra.
Facing following error:
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000080000000, 1073741824, 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 1073741824 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /../../../hs_err_pid16347.log
hs_err_pid16347.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1073741824 bytes for committing reserved memory.
# Possible reasons:
# The system is out of physical RAM or swap space
# The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap
# Possible solutions:
# Reduce memory load on the system
# Increase physical memory or swap space
# Check if swap backing store is full
# Decrease Java heap size (-Xmx/-Xms)
# Decrease number of Java threads
# Decrease Java thread stack sizes (-Xss)
# Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
# Out of Memory Error (os_linux.cpp:2760), pid=16347, tid=0x00007f7a61dec700
#
# JRE version: (8.0_212-b04) (build )
# Java VM: OpenJDK 64-Bit Server VM (25.212-b04 mixed mode linux-amd64 compressed oops)
# Core dump written. Default location: /../logs/core or core.16347
#
--------------- T H R E A D ---------------
Current thread (0x00007f7a5800dae0): JavaThread "Unknown thread" [_thread_in_vm, id=16349, stack(0x00007f7a61dad000,0x00007f7a61ded000)]
Stack: [0x00007f7a61dad000,0x00007f7a61ded000], sp=0x00007f7a61deb520, free space=249k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xa7ffb2] VMError::report_and_die()+0x2e2
V [libjvm.so+0x4cae47] report_vm_out_of_memory(char const*, int, unsigned long, VMErrorType, char const*)+0x67
V [libjvm.so+0x8c0ed0] os::pd_commit_memory(char*, unsigned long, unsigned long, bool)+0x100
V [libjvm.so+0x8b85ff] os::commit_memory(char*, unsigned long, unsigned long, bool)+0x1f
V [libjvm.so+0xa7c2ac] VirtualSpace::initialize(ReservedSpace, unsigned long)+0x20c
V [libjvm.so+0x5cf3e6] Generation::Generation(ReservedSpace, unsigned long, int)+0x96
V [libjvm.so+0x4d4b80] DefNewGeneration::DefNewGeneration(ReservedSpace, unsigned long, int, char const*)+0x30
V [libjvm.so+0x8e24ef] ParNewGeneration::ParNewGeneration(ReservedSpace, unsigned long, int)+0x2f
V [libjvm.so+0x5d0d26] GenerationSpec::init(ReservedSpace, int, GenRemSet*)+0x3d6
V [libjvm.so+0x5bbbaf] GenCollectedHeap::initialize()+0x20f
V [libjvm.so+0xa4326a] Universe::initialize_heap()+0x16a
V [libjvm.so+0xa43553] universe_init()+0x33
V [libjvm.so+0x613000] init_globals()+0x50
V [libjvm.so+0xa24cc5] Threads::create_vm(JavaVMInitArgs*, bool*)+0x4e5
V [libjvm.so+0x68c691] JNI_CreateJavaVM+0x51
C [libjli.so+0x7f44] JavaMain+0x84
C [libpthread.so.0+0x7ea5] start_thread+0xc5
Did check "free -m" and there is enough memory available but still this error related to memory, what could be this related to? The -Xmn1G defined here.
Thinking enough memory available did try checking "ulimit -a" and updated as per this link recommendation https://serverfault.com/questions/662992/java-on-linux-insufficient-memory-even-though-there-is-plenty-of-available-memor
Rebooted the system and tried again to start Cassandra but still facing the same issue. Are there any additional settings at system level which needs to be updated here?
Also can anyone please share Cassdandra 3.11 and Operating System compatibility matrix?