AIX 5.3上
下面是文件/etc/security/limits文件里面有关软限制和硬限制的部分。
*
* Sizes are in multiples of 512 byte blocks, CPU time is in seconds
*
* fsize - soft file size in blocks
* core - soft core file size in blocks
* cpu - soft per process CPU time limit in seconds
* data - soft data segment size in blocks
* stack - soft stack segment size in blocks
* rss - soft real memory usage in blocks
* nofiles - soft file descriptor limit
* fsize_hard - hard file size in blocks
* core_hard - hard core file size in blocks
* cpu_hard - hard per process CPU time limit in seconds
* data_hard - hard data segment size in blocks
* stack_hard - hard stack segment size in blocks
* rss_hard - hard real memory usage in blocks
* nofiles_hard - hard file descriptor limit
* The following table contains the default hard values if the
* hard values are not explicitly defined:
*
* Attribute Value
* ========== ============
* fsize_hard set to fsize
* cpu_hard set to cpu
* core_hard -1
* data_hard -1
* stack_hard 8388608
* rss_hard -1
* nofiles_hard -1
default:
fsize = -1
core = 2097151
cpu = -1
data = -1
rss = -1
stack = -1
nofiles = 2000
说明:
1.ulimit -Ha 输出硬限制的值
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited
stack(kbytes) 4194304
memory(kbytes) unlimited
coredump(blocks) unlimited
nofiles(descriptors) unlimited
因为在/etc/security/limits没有明确写明对硬限制的设置,所以,取默认的硬限制的值,也就是上面注释文字里面写的那些,stack还是有限制的。
2.
ulimit -a 输出软限制的值
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited
stack(kbytes) 4194304
memory(kbytes) unlimited
coredump(blocks) 2097151
nofiles(descriptors) 2000
软限制取/etc/security/limits里面default里面的值,虽然里面写的stack没限制,但是由于硬限制已经提前限制了41944304,所以,stack的最大也只能是41944304。
3.如何更改硬限制和软限制的值?
1) 编辑文件/etc/security/limits,直接修改各定义值。此更改在用户退出重新登陆就生效。
2) 使用命令ulimit修改默认值。例如:
ulimit -f value
ulimit -c
ulimit -t
ulimit -d
ulimit -s
ulimit -m
ulimit -n
将修改fsize, core, cpu,data, stack, rss和nofiles的soft limit值。
3) 使用命令chuser修改某用户的限定值。例如:
chuser fsize=
chuser core= chuser cpu=
chuser data=
chuser limit=
chuser rss=
chuser nofiles=
将用户“username”的soft limits改为值“value”。
chuser hard_fsize=
chuser hard_core=
chuser hard_cpu=
chuser hard_data=
chuser hard_limit=
chuser hard_rss=
chuser hard_nofiles=
将用户“username”的hard limits改为值“value”。
4)smit chuser里面也是可以修改的
阅读(3465) | 评论(0) | 转发(0) |