Tested on Junos 10.4 and later

Operational Script for Junos to see performance stats on a Data Center SRX:

copy the script into /var/db/scripts/op/

Enter the following into your config:

set system scripts op file srx-monitor.xsl

user@router> op srx-monitor 
Route Engine
Slot Mem Size Mem Used CPU Avg CPU User CPU Bkgd CPU Krnl CPU Intpt CPU Idle
--------------------------------------------------------------------------------
   0    1023        44      16        3        0       12         1       84
SPUs
FPC PIC CPU Mem  Flow Sess Cur   Flow Ses Max     CP Ses Cur     CP Ses Max
--------------------------------------------------------------------------------
  3   0   0  54              0         204800              0        2359296
  4   0   0  42              0         409600              0              0
  5   0   0  42              0         409600              0              0
  6   0   0  42              0         409600              0              0
  7   0   0  42              0         409600              0              0
  8   0   0  47              0         409600              0              0
  9   0   0  42              0         409600              0              0
Detailed Session Summary per SPU
 SPU  Unicast Multicst   Failed   Active    Valid  Pending  Invalid    Other      Max
-------------------------------------------------------------------------------------
   1        0        0        0        0        0        0        0        0   204800
   2        0        0        0        0        0        0        0        0   409600
   3        0        0        0        0        0        0        0        0   409600
   4        0        0        0        0        0        0        0        0   409600
   5        0        0        0        0        0        0        0        0   409600
   6        0        0        0        0        0        0        0        0   409600
   7        0        0        0        0        0        0        0        0   409600