MappedFile call sync occur Cannot allocate memory

[fuyou]

I write a MappedFile ,and a task call sync write to disk.
but occur :

java.io.IOException: Cannot allocate memory
     at java.nio.MappedByteBuffer.force0(Native Method)
     at java.nio.MappedByteBuffer.force(MappedByteBuffer.java:154)

the os is Red Hat Enterprise Linux Server release 5.4
java is java version "1.6.0_23"
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  fuyou001
Best Regards