下载地址:http://pyropus.ca/software/memtester/  有源码安装包、deb包、rpm包等。
  源码已经编译好,只要make一下好了。
  使用方法:
  Usage: memtester [-p physaddrbase] <mem>[B|K|M|G] [loops]
  如:
  memtester 28G 3 #测试28G的内存3次。
  因为系统运行和本工具运行都需要内存,所以不能把所有的内存都测试到。可以先用free 命令查看系统剩余多少内存空间再测试。
  高级点的可以用-p参数从内存地址开始测试。
memtester version 4.2.0 (64-bit)
Copyright (C) 2010 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffffffffffff000
want 28672MB (30064771072 bytes)
got  28672MB (30064771072 bytes), trying mlock ...locked.
Loop 1/3:
Stuck Address       : testing   0memtester version 4.2.0 (64-bit)
Copyright (C) 2010 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffffffffffff000
want 28672MB (30064771072 bytes)
got  28672MB (30064771072 bytes), trying mlock ...locked.
Loop 1/3:
Stuck Address       : ok
Random Value        : ok
Compare XOR         : ok
Compare SUB         : ok
Compare MUL         : ok
Compare DIV         : ok
Compare OR          : ok
Compare AND         : ok
Sequential Increment: ok
Solid Bits          : ok
Block Sequential    : ok
Checkerboard        : ok
Bit Spread          : ok
Bit Flip            : ok
Walking Ones        : ok
Walking Zeroes      : ok
8-bit Writes        : ok
16-bit Writes       : ok
  结果全部为OK则内存正常。