Shared_memory_segments

QUERY

ipcs -l

or for the memory only:

ipcs -lm

   ------ Shared Memory Limits --------
   max number of segments = 4096               // SHMMNI	
   max seg size (kbytes) = 32768               // SHMMAX
   max total shared memory (kbytes) = 8388608  // SHMALL
   min seg size (bytes) = 1

CHANGE KERNEL PARAMETERS:

vim /etc/sysctl.conf

Your edits here:

# ZSims configurations
kernel.shmmax=18014398509465599
kernel.yama.ptrace_scope=0
kernel.shmall=18014398509465599

sysctl -p

CHECK MEMORY (RAM) SPACE and SWAP

free

             total       used       free     shared    buffers     cached
Mem:      65980220    5338908   60641312          0     391848    3953228
-/+ buffers/cache:     993832   64986388
Swap:       786428          0     786428

CHECK MOUNTING POINT OF SHARED MEMORY

df -h

Filesystem                  Size  Used Avail Use% Mounted on
/dev/mapper/precise64-root   79G  6.0G   70G   8% /
udev                         32G   12K   32G   1% /dev
tmpfs                        13G  304K   13G   1% /run
none                        5.0M     0  5.0M   0% /run/lock
none                         32G     0   32G   0% /run/shm    <- ************ THIS IS WHERE IT IS MOUNTED => MAX 32GB
/dev/sda1                   228M   50M  167M  23% /boot
vagrant                     785G  222G  564G  29% /vagrant

RESIZE SHARED MEMORY MAX SIZE

sudo vim /etc/fstab add the following to use all of your RAM size:

none   /run/shm        tmpfs   defaults,size=100%      0       0 # OR maybe tmpfs

Or if it's already booted:

mount -o remount,size=100% /run/shm