Unable to run any hadoop commands

Unable to run any hadoop commands, due to insuffiecient memory
[deepak_kotla@gw01 ~]$ hadoop fs -cat /user/deepak_kotla/op7/part-r-00000 | sort -k1
Java HotSpot™ 64-Bit Server VM warning: INFO: os::commit_memory(0x0000788197b00000, 175112192, 0) failed; error=‘Cannot allocate memory’ (errno=12)

An error report file with more information is saved as:

/home/deepak_kotla/hs_err_pid24905.log

Native memory allocation (mmap) failed to map 175112192 bytes for committing reserved memory.

There is insufficient memory for the Java Runtime Environment to continue.