Out of memory error while using eye function.

Question

puneet singh 2016-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/297479-out-of-memory-error-while-using-eye-function

回答： John D'Errico 2016-7-28

Dear Sir/Madam, I am getting Out of memory error while allocating an array(214748 x 314748 x 4) of size 270366014016 bytes or 270G

 >> C=eye(214748,314748);
    Error using eye
    Out of memory. Type HELP MEMORY for your options

i have approx 500G memory on my 64 bit machine and i had >400G free when i was trying to allocate.

free -g
             total       used       free     shared    buffers     cached
Mem:           504         58        445          0          0         46
-/+ buffers/cache:         11        493
Swap:            7          0          7

Out of memory. Type HELP MEMORY for your options

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 4133744
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) unlimited
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Why this allocation failed?

Are there some default upper limits?

can i override them?

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Stephen23 2016-7-28

编辑：Stephen23 2016-7-28

@Adam: it seems a lot of people don't know the difference between memory (RAM) and drive size (hard-drive, SSD, tape, etc). But luckily the difference is easy to learn.

John D'Errico 2016-7-28

But the use of eye for that large of a problem is not an issue of understanding the difference between disk space and RAM. It is understanding why one would ever want to do that, blindly applying a formula to a problem, with no recourse to common sense, with no recourse to the available tools, here sparse matrix tools.

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