Problem/Bug Server memory problem

Hi,

We recently moved our server up to the 1.7.10 build after we'd been sitting on it awhile, and we have a persistent memory problem. We have 8 gb of ram allocated to the Minecraft server, but for some reason, the server is consistently crashing at around 3-4 gb.

Plugins we installed include:
Echopet
Citizens 2
Quests
Jobs
Regionforsale
Cinema

Our current plugins:
WorldBorder
GroupManager
WorldEdit
Vault
Cinema
LogBlock
Questioner
WorldGuard
SimpleRestart
AutoMessage
EmergencyDowntime
iConomy
Minigames
ServerLogSaver
OpenInv
Lockette
ProtocolLib
Votifier
HolographicDisplays
mcMMO
Essentials
Citizens
Jobs
EssentialsProtect
Towny
EssentialsSpawn
RegionForSale
Quests
EssentialsAntiBuild
EchoPet
EnjinMinecraftPlugin
VotifierScripts
OnTime
ChestShop
EssentialsChat
ShowCaseStandalone

Upon loading up the server, we're almost immediately taken to 3.0 gigs, and we don't get to do much of anything before the memory builds up and we crash.

 

Fixed- Java was accidentally installed in 32-bit, apparently. Not my doing.