【求助】AIX下进程内存分配问题，无法分配超过256M的内存

[kmkjwjf]

在启动一个进程时，分配256M内存时提示

malloc:Not Enough Space

根据提示，我理解是系统对用户内存分配限制问题，因此修改ulimit，内存相关全部修改为ulimited：

# ulimit -a
time(seconds)        unlimited
file(blocks)         2097151
data(kbytes)         unlimited
stack(kbytes)        unlimited
memory(kbytes)       unlimited
coredump(blocks)     2097151
nofiles(descriptors) 2000
threads(per process) unlimited
processes(per user)  unlimited

然后执行分配256M内存时程序正常启动，但是当我关闭程序重启，并设置分配288M内存时，又出现相同错误。
问题是我已经显式设置ulimit中内存分配的部分为无限制了，是不是AIX系统下还有其他地方限制？
求高手解答。另外，系统内存是绝对足够的，有32G之多呢：

# lsattr -El mem0
ent_mem_cap          I/O memory entitlement in Kbytes           False
goodsize       32768 Amount of usable physical memory in Mbytes False
mem_exp_factor       Memory expansion factor                    False
size           32768 Total amount of physical memory in Mbytes  False
var_mem_weight       Variable memory capacity weight            False

[kmkjwjf]

[Quote=引用 1 楼 justkk 的回复:]
用vmstat 看看呢
[/Quote]

# vmstat

System configuration: lcpu=32 mem=32768MB ent=8.00

kthr    memory              page              faults              cpu          
----- ----------- ------------------------ ------------ -----------------------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa    pc    ec
 1  1 775698 7548738   0   0   0   0    0   0  22  763 193  0  0 99  0  0.00   0.0

[kmkjwjf]

用NMON监控内存的使用，也是显示有大量空闲内存，怎么才能让我的程序用上呢？

qtopas_nmonqqA=Async-I/OqqqqqqqqHost=WQqqqqqqqqqqqqqRefresh=2 secsqqq00:46.50qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk
x Memory qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqx
x          Physical  PageSpace |        pages/sec  In     Out | FileSystemCache                                                                                                                          x
x% Used       10.0%      2.0%  | to Paging Space   0.0    0.0 | (numperm)  0.7%                                                                                                                          x
x% Free       90.0%     98.0%  | to File System    0.0    0.0 | Process    4.0%                                                                                                                          x
xMB Used    3283.0MB    10.4MB | Page Scans        0.0        | System     5.3%                                                                                                                          x
xMB Free   29485.0MB   501.6MB | Page Cycles       0.0        | Free      90.0%                                                                                                                          x
xTotal(MB) 32768.0MB   512.0MB | Page Steals       0.0        |           ------                                                                                                                         x
x                              | Page Faults       0.0        | Total    100.0%                                                                                                                          x
x------------------------------------------------------------ | numclient  0.7%                                                                                                                          x
xMin/Maxperm     952MB(  3%)  28549MB( 87%) <--% of RAM       | maxclient 87.1%                                                                                                                          x
xMin/Maxfree     960   1088       Total Virtual   32.5GB      | User       1.7%                                                                                                                          x
xMin/Maxpgahead    2      8    Accessed Virtual    3.0GB  9.1%| Pinned     5.7%              

[kmkjwjf]

在网上查到一个资料：http://www.ahinc.com/aix/security.htm

data maximum Size of data segment for a process (malloc call) Data and stack are tied together. stack maximum Size of stack segment for a process. Combined, they can never
be greater than 256 MB.

[justkk]

还真没关注有这个限制
那lz看看你的环境中的限制参数 /etc/security/limits

[kmkjwjf]

上面的排版不好，重新来一次
data maximum Size of data segment for a process (malloc call)
stack maximum Size of stack segment for a process.

Data and stack are tied together。Combined, they can never be greater than 256 MB.

[justkk]

用vmstat 看看呢

[争取今天]

AIX 这个限制和版本有关系,你可以试一下LDR_CNTRL环境变量,应该就能解决.
export LDR_CNTRL=MAXDATA=0x10000000 (上限512M)
LDR_CNTRL=MAXDATA=0x2000000 (上限768M)
LDR_CNTRL=MAXDATA=0x3000000 (上限1024M)
start_process

[wqc_zj1]

这是AIX32位的限制。若要使用超过236M内存。启用大
export LDR_CNTRL=0X200000(字节）
export MAXDATA=0x3000000
将上述环境变量加到你用C的用户profile中。
在AIX5.3以后的系统。可直接改为64位也可

[jesson246]

直接通过HMC很容易分配的