下面这段代码是什么意思？

soccer

# ipcs -lm | grep ’max seg size’
max seg size (kbytes) = 32768
#echo ’512 * 1024 * 1024’|bc > /proc/sys/kernel/shmmax
#ipcs -lm | grep 'max seg size'
max seg size (kbytes) = 524288

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谢谢

wangyb

first query the shared memory size limit for IPC,it reports 32M.
then set shared memory (usually mounted as /dev/shm) max size to 512M
last,re-query the size.