CODEWITHSUNDEEP
linuxshellmemory
beasone
beasone

Reputation: 1085

how to increase virtual memory for each one on linux ?(command line)

I just allocate some virtual memory for each account, 

 pi@duckpi01 /etc $ ulimit -v 100
pi@duckpi01 /etc $ ulimit -v 200
-bash: ulimit: virtual memory: cannot modify limit: Operation not permitted
pi@duckpi01 /etc $ ulimit -v 99
pi@duckpi01 /etc $ ulimit -v 101
-bash: ulimit: virtual memory: cannot modify limit: Operation not permitted
pi@duckpi01 /etc $ ulimit -v 100
-bash: ulimit: virtual memory: cannot modify limit: Operation not permitted
pi@duckpi01 /etc $ ulimit -v 200
-bash: ulimit: virtual memory: cannot modify limit: Operation not permitted
pi@duckpi01 /etc $ cd security
pi@duckpi01 /etc/security $ vi limits.conf
Segmentation fault
pi@duckpi01 /etc/security $ sudo ulimit -v 200
Segmentation fault

But now I cannot use ulimit to allocate memory more than 99. Apparently, 99kbytes is not enough for me to do anything. I use sudo, but it does't work. How could I do to fix this problem?

This doesn't work :

pi@duckpi01 /etc/security $ sudo mount -t tmpfs -o size=2048M tmpfs /media/nameme/
Segmentation fault
pi@duckpi01 /etc/security $ sudo mount -t tmpfs -o size=500M tmpfs /media/nameme/
Segmentation fault

This doesn't work,too:

pi@duckpi01 /etc/security $ sudo ulimit -v unlimited
Segmentation fault
pi@duckpi01 ~ $ sudo su
Segmentation fault
pi@duckpi01 ~ $ mkdir -p /media/nameme
Segmentation fault
pi@duckpi01 ~ $ free -m
Segmentation fault
pi@duckpi01 ~ $ sudo ulimit -v
Segmentation fault
pi@duckpi01 ~ $ ulimit -v
99
pi@duckpi01 ~ $ su -u root
Segmentation fault

Doesn't work:

pi@duckpi01 ~ $ ulimit -c unlimited
pi@duckpi01 ~ $ ulimit -v
99
pi@duckpi01 ~ $ ulimit -v 10000
-bash: ulimit: virtual memory: cannot modify limit: Operation not permitted
pi@duckpi01 ~ $ ls
Segmentation fault

Upvotes: 0

Views: 2924

Answers (2)

Farvardin
Farvardin

Reputation: 5424

login as root and reset limits:

su -u root    
ulimit -v unlimited

or logout from current user and login as root:

logout

Upvotes: 2

chintan thakar
chintan thakar

Reputation: 1500

you can try by RAM disk facility if suppose you have 4GB of RAM than you can use following command

mount -t tmpfs -o size=2048M tmpfs /media/nameme/

And maximum utilization of resources.

Upvotes: 1

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