mongo服务启动失败： ERROR: mmap private failed with out of memory

平时在树莓派上开机自动执行以下命令，启动mongo服务

sudo mongod --fork --dbpath /home/pi/mongo/db/ --smallfiles --journal --logpath /home/pi/mongo/log.txt

突然今天发现mongo的服务连不上，看log发现mongo在启动后马上关闭了，提示的错误是在加载一个大的数据文件的时候提示内存不足（坑爹的，树莓派自身内存才1GB，无法扩容）。 
 
错误日志：

Sun May 13 12:08:11.185 [initandlisten] MongoDB starting : pid=1929 port=27017 dbpath=/home/pi/mongo/db/ 32-bit host=raspberrypi

Sun May 13 12:08:11.186 [initandlisten] 

Sun May 13 12:08:11.186 [initandlisten] ** NOTE: This is a 32 bit MongoDB binary.

Sun May 13 12:08:11.186 [initandlisten] **       32 bit builds are limited to less than 2GB of data (or less with --journal).

Sun May 13 12:08:11.186 [initandlisten] **       See http://dochub.mongodb.org/core/32bit

Sun May 13 12:08:11.187 [initandlisten] 

Sun May 13 12:08:11.187 [initandlisten] db version v2.4.10

Sun May 13 12:08:11.187 [initandlisten] git version: nogitversion

Sun May 13 12:08:11.187 [initandlisten] build info: Linux bm-wb-04 3.19.0-trunk-armmp #1 SMP Debian 3.19.1-1~exp1+plugwash1 (2015-03-28) armv7l BOOST_LIB_VERSION=1_55

Sun May 13 12:08:11.187 [initandlisten] allocator: system

Sun May 13 12:08:11.187 [initandlisten] options: { dbpath: "/home/pi/mongo/db/", fork: true, journal: true, logpath: "/home/pi/mongo/mongod.log" }

Sun May 13 12:08:11.198 [initandlisten] journal dir=/home/pi/mongo/db/journal

Sun May 13 12:08:11.198 [initandlisten] recover : no journal files present, no recovery needed

Sun May 13 12:08:11.238 [initandlisten] ERROR: mmap private failed with out of memory. You are using a 32-bit build and probably need to upgrade to 64

Sun May 13 12:08:11.239 [initandlisten] Assertion: 13636:file /home/pi/mongo/db/xueqiu.5 open/create failed in createPrivateMap (look in log for more information)

0x662fa8 0x63527c 0x6196c0 0x6197bc 0x409d5c 0x4414fc 0x2ea634 0x2eaa3c 0x2eb55c 0x2ebd98 0x26f998 0x26fb94 0x175a20 0x177bf4 0x152bf0 0x76556294 

 mongod(_ZN5mongo15printStackTraceERSo+0x1c) [0x662fa8]

 mongod(_ZN5mongo10logContextEPKc+0x110) [0x63527c]

 mongod(_ZN5mongo11msgassertedEiPKc+0xc0) [0x6196c0]

 mongod(_ZN5mongo18msgassertedNoTraceEiPKc+0) [0x6197bc]

 mongod(_ZN5mongo8MongoMMF13finishOpeningEv+0x308) [0x409d5c]

 mongod(_ZN5mongo13MongoDataFile12openExistingEPKc+0x9c) [0x4414fc]

 mongod(_ZN5mongo8Database16openExistingFileEi+0x23c) [0x2ea634]

 mongod(_ZN5mongo8Database12openAllFilesEv+0x24) [0x2eaa3c]

 mongod(_ZN5mongo8DatabaseC2EPKcRbRKSs+0x158) [0x2eb55c]

 mongod(_ZN5mongo14DatabaseHolder11getOrCreateERKSsS2_Rb+0x500) [0x2ebd98]

 mongod(_ZN5mongo6Client7Context11_finishInitEv+0x34) [0x26f998]

 mongod(_ZN5mongo6Client7ContextC1ERKSsS3_b+0x78) [0x26fb94]

 mongod(_ZN5mongo14_initAndListenEi+0xb00) [0x175a20]

 mongod(_ZN5mongo13initAndListenEi+0x14) [0x177bf4]

 mongod(main+0x2b8) [0x152bf0]

 /lib/arm-linux-gnueabihf/libc.so.6(__libc_start_main+0x114) [0x76556294]

Sun May 13 12:08:11.250 [initandlisten] warning database /home/pi/mongo/db/ xueqiu could not be opened

Sun May 13 12:08:11.251 [initandlisten] DBException 13636: file /home/pi/mongo/db/xueqiu.5 open/create failed in createPrivateMap (look in log for more information)

Sun May 13 12:08:11.251 [initandlisten] exception in initAndListen: 13636 file /home/pi/mongo/db/xueqiu.5 open/create failed in createPrivateMap (look in log for more information), terminating

Sun May 13 12:08:11.251 dbexit: 

Sun May 13 12:08:11.252 [initandlisten] shutdown: going to close listening sockets...

Sun May 13 12:08:11.252 [initandlisten] shutdown: going to flush diaglog...

Sun May 13 12:08:11.252 [initandlisten] shutdown: going to close sockets...

Sun May 13 12:08:11.252 [initandlisten] shutdown: waiting for fs preallocator...

Sun May 13 12:08:11.252 [initandlisten] shutdown: lock for final commit...

Sun May 13 12:08:11.252 [initandlisten] shutdown: final commit...

Sun May 13 12:08:11.252 [initandlisten] shutdown: closing all files...

Sun May 13 12:08:11.252 [initandlisten] closeAllFiles() finished

Sun May 13 12:08:11.252 [initandlisten] journalCleanup...

Sun May 13 12:08:11.253 [initandlisten] removeJournalFiles

Sun May 13 12:08:11.263 [initandlisten] shutdown: removing fs lock...

Sun May 13 12:08:11.264 dbexit: really exiting now

看了下mongod的用法，尝试把参数 --journal，去掉，重新运行，然后就可以了。
 

sudo mongod --fork --dbpath /home/pi/mongo/db/ --smallfiles --logpath /home/pi/mongo/log.txt