Hadoop error=12 Cannot allocate memory

[Rohini U]

Hi,

I have a hadoop cluster of size 5 and a data of size 1GB. I am running
a simple map reduce program which reads text data and outputs
 sequence files.
I found some solutions to this problem suggesting to set over commmit
to 0 and to increase the unlimit.
I have memory over commit set to 0 and have ulimit unlimited. Even
with this, I keep getting the following error. Is any one aware
of any work arounds for this?
java.io.IOException: Cannot run program "bash": java.io.IOException:

*Error:
*
*error*=12, Cannot allocate memory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
        at org.apache.hadoop.util.Shell.run(Shell.java:134)
        at org.apache.hadoop.fs.DF.getAvailable(DF.java:73)
        at 
org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:296)
        at 
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:124)
        at 
org.apache.hadoop.mapred.MapOutputFile.getSpillFileForWrite(MapOutputFile.java:107)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:734)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:694)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:220)
        at 
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2124)



Thanks
-Rohini