Minecraft Forums

Occasionally I'll have this problem where, after ten to thirty minutes of playing Minecraft, I will be hit by this harsh lag spike that drops me down to 0 FPS periodically until I restart the client. Today, I tried turning on Optifine's multi-core functionality, and this happened at one point:

---- Minecraft Crash Report ----
// Don't do that.
Time: 4/6/13 9:38 PM
Description: Updating screen events
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at ci.d(SourceFile:371)
at bdl.b(NetClientHandler.java:649)
at bdt.D(SourceFile:194)
at axl.a(SourceFile:46)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at ci.d(SourceFile:371)
at bdl.b(NetClientHandler.java:649)
at bdt.D(SourceFile:194)
at axl.a(SourceFile:46)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
-- Affected screen --
Details:
Screen name: axl
-- Affected level --
Details:
Level name: MpServer
All players: 2 total; [bdw['Razwerkz'/317795, l='MpServer', x=148.70, y=70.62, z=167.80], bfl['CaptainInzane'/166051, l='MpServer', x=145.66, y=69.00, z=167.69]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (232,64,256), Chunk: (at 8,4,0 in 14,16; contains blocks 224,0,256 to 239,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 418637 game time, 638157 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 111 total; [sj['Zombie'/321800, l='MpServer', x=223.56, y=48.00, z=184.25], sj['Zombie'/321801, l='MpServer', x=224.50, y=48.00, z=184.50], sj['Zombie'/321802, l='MpServer', x=213.50, y=51.00, z=189.84], sh['Spider'/271152, l='MpServer', x=137.69, y=72.00, z=201.19], ru['Creeper'/321261, l='MpServer', x=141.50, y=53.00, z=117.50], sf['Skeleton'/320711, l='MpServer', x=112.50, y=35.00, z=197.50], ru['Creeper'/321251, l='MpServer', x=224.50, y=47.00, z=183.50], rv['Enderman'/324246, l='MpServer', x=165.38, y=64.00, z=191.41], bfl['CaptainInzane'/166051, l='MpServer', x=145.66, y=69.00, z=167.69], nc['Experience Orb'/281881, l='MpServer', x=291.97, y=69.25, z=138.19], ru['Creeper'/323447, l='MpServer', x=201.50, y=41.00, z=207.50], ru['Creeper'/323769, l='MpServer', x=213.50, y=64.00, z=176.50], ru['Creeper'/323448, l='MpServer', x=201.50, y=41.00, z=206.50], ru['Creeper'/324251, l='MpServer', x=184.50, y=64.00, z=223.50], sj['Zombie'/321227, l='MpServer', x=217.50, y=57.00, z=176.50], sh['Spider'/318057, l='MpServer', x=219.75, y=22.93, z=161.41], sf['Skeleton'/321245, l='MpServer', x=199.50, y=25.00, z=230.50], qg['Bat'/324286, l='MpServer', x=165.14, y=37.01, z=97.04], ru['Creeper'/320759, l='MpServer', x=182.50, y=43.00, z=223.31], qg['Bat'/324288, l='MpServer', x=164.30, y=37.00, z=98.67], sj['Zombie'/324299, l='MpServer', x=177.50, y=24.00, z=176.50], sf['Skeleton'/324302, l='MpServer', x=114.50, y=14.00, z=117.50], sf['Skeleton'/324303, l='MpServer', x=115.50, y=14.00, z=117.50], sj['Zombie'/324300, l='MpServer', x=110.06, y=14.00, z=117.38], qg['Bat'/320508, l='MpServer', x=215.75, y=19.00, z=242.75], sj['Zombie'/324301, l='MpServer', x=107.72, y=13.47, z=120.65], sj['Zombie'/323829, l='MpServer', x=96.50, y=64.00, z=111.50], sj['Zombie'/323828, l='MpServer', x=100.16, y=64.00, z=102.84], qg['Bat'/321880, l='MpServer', x=184.75, y=27.10, z=151.56], qg['Bat'/321883, l='MpServer', x=191.16, y=26.54, z=241.25], qg['Bat'/321877, l='MpServer', x=184.75, y=27.10, z=151.50], sf['Skeleton'/323836, l='MpServer', x=76.50, y=51.00, z=149.50], ru['Creeper'/323833, l='MpServer', x=93.47, y=45.00, z=150.00], sf['Skeleton'/323835, l='MpServer', x=72.50, y=51.00, z=151.50], ru['Creeper'/323834, l='MpServer', x=79.31, y=51.00, z=148.75], sj['Zombie'/322381, l='MpServer', x=191.50, y=52.00, z=99.50], qn['Pig'/165848, l='MpServer', x=144.34, y=64.00, z=92.78], qg['Bat'/320313, l='MpServer', x=214.75, y=16.10, z=184.50], sg['Slime'/165854, l='MpServer', x=159.25, y=26.00, z=208.78], qg['Bat'/318653, l='MpServer', x=226.34, y=44.00, z=115.25], qn['Pig'/165855, l='MpServer', x=154.16, y=67.00, z=215.81], sg['Slime'/165840, l='MpServer', x=128.69, y=32.13, z=193.31], qg['Bat'/321129, l='MpServer', x=203.60, y=15.72, z=188.79], sg['Slime'/165841, l='MpServer', x=143.31, y=35.00, z=218.91], qo['Sheep'/165842, l='MpServer', x=131.84, y=71.00, z=216.16], sf['Skeleton'/320589, l='MpServer', x=79.50, y=34.00, z=97.50], qn['Pig'/165843, l='MpServer', x=143.41, y=70.00, z=233.13], sg['Slime'/274868, l='MpServer', x=103.69, y=33.00, z=242.31], qn['Pig'/165928, l='MpServer', x=214.50, y=67.00, z=92.16], sj['Zombie'/310854, l='MpServer', x=196.50, y=34.00, z=187.50], qn['Pig'/165931, l='MpServer', x=215.84, y=66.00, z=108.06], qn['Pig'/165932, l='MpServer', x=228.13, y=66.00, z=115.03], ru['Creeper'/319519, l='MpServer', x=210.50, y=13.00, z=194.97], qn['Pig'/165933, l='MpServer', x=212.94, y=66.00, z=130.16], sh['Spider'/323034, l='MpServer', x=175.75, y=26.00, z=209.25], sf['Skeleton'/319385, l='MpServer', x=133.63, y=50.00, z=197.06], sf['Skeleton'/318152, l='MpServer', x=220.50, y=29.00, z=181.50], qn['Pig'/165824, l='MpServer', x=125.03, y=72.00, z=208.97], sj['Zombie'/322490, l='MpServer', x=192.50, y=6.00, z=111.50], sf['Skeleton'/321948, l='MpServer', x=216.50, y=30.00, z=172.50], qn['Pig'/165829, l='MpServer', x=128.53, y=65.00, z=95.78], rv['Enderman'/321949, l='MpServer', x=218.66, y=30.00, z=173.41], rv['Enderman'/321950, l='MpServer', x=217.63, y=30.00, z=174.22], qn['Pig'/165830, l='MpServer', x=136.03, y=64.00, z=104.97], sj['Zombie'/323047, l='MpServer', x=182.72, y=44.00, z=90.53], ru['Creeper'/318848, l='MpServer', x=93.84, y=45.00, z=152.38], sf['Skeleton'/323044, l='MpServer', x=120.53, y=49.00, z=178.94], qn['Pig'/165904, l='MpServer', x=211.13, y=66.00, z=95.09], qo['Sheep'/165911, l='MpServer', x=202.66, y=67.00, z=134.47], qn['Pig'/165902, l='MpServer', x=198.75, y=63.00, z=104.16], qn['Pig'/165903, l='MpServer', x=196.94, y=63.00, z=96.06], qn['Pig'/165901, l='MpServer', x=201.84, y=63.00, z=98.41], sj['Zombie'/323267, l='MpServer', x=93.50, y=21.00, z=247.50], qn['Pig'/165890, l='MpServer', x=176.84, y=68.00, z=240.19], qn['Pig'/165891, l='MpServer', x=181.13, y=69.00, z=245.06], qn['Pig'/165857, l='MpServer', x=154.63, y=68.00, z=243.03], qn['Pig'/165856, l='MpServer', x=155.50, y=67.00, z=236.16], qo['Sheep'/165862, l='MpServer', x=164.88, y=64.00, z=118.06], sj['Zombie'/323269, l='MpServer', x=211.50, y=13.00, z=112.50], bdw['Razwerkz'/317795, l='MpServer', x=148.70, y=70.62, z=167.80], ru['Creeper'/322719, l='MpServer', x=225.50, y=47.00, z=182.50], sj['Zombie'/315375, l='MpServer', x=202.50, y=16.00, z=111.50], qr['Squid'/320370, l='MpServer', x=150.53, y=57.51, z=136.51], ru['Creeper'/318709, l='MpServer', x=179.50, y=31.00, z=235.50], sj['Zombie'/318708, l='MpServer', x=84.50, y=34.00, z=112.50], qr['Squid'/320373, l='MpServer', x=147.50, y=59.00, z=133.50], qr['Squid'/320372, l='MpServer', x=158.31, y=59.09, z=136.48], bfl['CaptainInzane'/166051, l='MpServer', x=145.66, y=69.00, z=167.69], ru['Creeper'/314566, l='MpServer', x=100.50, y=12.00, z=120.50], sg['Slime'/165822, l='MpServer', x=118.69, y=38.23, z=195.31], qo['Sheep'/165823, l='MpServer', x=114.16, y=64.00, z=202.09], sg['Slime'/165821, l='MpServer', x=115.31, y=38.00, z=203.69], sj['Zombie'/322501, l='MpServer', x=200.50, y=36.00, z=232.50], qg['Bat'/317591, l='MpServer', x=174.75, y=41.10, z=144.25], qn['Pig'/165816, l='MpServer', x=105.19, y=71.00, z=247.94], sj['Zombie'/321298, l='MpServer', x=84.50, y=15.00, z=184.50], qo['Sheep'/165814, l='MpServer', x=108.22, y=64.00, z=115.38], ru['Creeper'/323460, l='MpServer', x=189.50, y=13.00, z=109.50], qg['Bat'/317592, l='MpServer', x=174.72, y=42.10, z=139.25], qo['Sheep'/165813, l='MpServer', x=97.81, y=64.00, z=122.88], sf['Skeleton'/316762, l='MpServer', x=150.50, y=37.00, z=221.50], qn['Pig'/165808, l='MpServer', x=81.50, y=54.00, z=242.50], qn['Pig'/165807, l='MpServer', x=83.78, y=63.00, z=243.50], qo['Sheep'/165805, l='MpServer', x=94.38, y=67.00, z=136.53], qo['Sheep'/165804, l='MpServer', x=90.78, y=64.00, z=120.53], sf['Skeleton'/313159, l='MpServer', x=224.50, y=29.00, z=177.50], ru['Creeper'/319610, l='MpServer', x=193.50, y=20.00, z=192.50], sj['Zombie'/322725, l='MpServer', x=177.69, y=26.00, z=207.31], ru['Creeper'/322724, l='MpServer', x=176.59, y=26.00, z=206.34], sj['Zombie'/322727, l='MpServer', x=174.75, y=26.00, z=205.91], sj['Zombie'/322726, l='MpServer', x=178.56, y=26.00, z=208.44]]
Retry entities: 0 total; []
Stacktrace:
at bdt.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)
-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 359204400 bytes (342 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 22119 (1238664 bytes; 1 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: GuiMobSpawner, IWrUpdater, Config, ...[com.sijobe.spc.command.StandardCommand, Achievement, Ascend, ...], [com.sijobe.spc.core.HookManager, IHook, IPlayerSP, ...], [com.sijobe.spc.hooks.CheckUpdates, InitialiseCommands, TestPlayerMP], [com.sijobe.spc.overwrite.ONetServerHandler], [com.sijobe.spc.updater.UpdateCallback, CheckVersion, ModVersion], [com.sijobe.spc.util.DynamicClassLoader, KeyListener, CommandBlockHelper, ...], [com.sijobe.spc.validation.Parameter, ParameterBoolean, ParameterDouble, ...], [com.sijobe.spc.worldedit.LocalPlayer, LocalWorld, MinecraftBiomeType, ...], [com.sijobe.spc.wrapper.Player, Minecraft, CommandBase, ...], [com.sk89q.worldedit.LocalPlayer, LocalWorld, BiomeType, ...], [com.sk89q.worldedit.foundation.World], [com.sk89q.worldedit.util.PropertiesConfiguration], [reifnsk.minimap.ReiMinimap, GuiScreenInterface, GuiOptionScreen, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
ModLoader: Mods loaded: 9
ModLoader 1.5.1
mod_ReiMinimap v3.3_04 [1.5.1]
mod_Armor 1.5.1
mod_Arrows 1.5.1
mod_Biosphere 1.5.1
mod_RecipeBook 1.5.1
mod_Shelf 1.5.1
mod_SpawnerGUI 1.5.1
mod_TooManyItems 1.5.1 2012-03-23
LWJGL: 2.4.2
OpenGL: GeForce GT 520/PCIe/SSE2/3DNOW! GL version 4.3.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Misa500.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: 3946 (220976 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used

What was the cause of this crash? Can I remedy this by changing some graphical settings?