抄录一段官方的解释：
A userspace utility for testing the memory subsystem for faults. It's portable and should compile and work on any 32- or 64-bit Unix-like system. (Yes, even weird, proprietary Unices, and even Mac OS X.) For hardware developers, memtester can be told to test memory starting at a particular physical address as of memtester version 4.1.0.
操作步骤如下：
[root@localhost ~]# wget http://pyropus.ca/software/memtester/old-versions/memtester-4.2.0.tar.gz
[root@localhost ~]# tar -xvf memtester-4.2.0.tar.gz
[root@localhost ~]# cd memtester-4.2.0
[root@localhost ~]# make && make install
[root@localhost memtester-4.2.0]# vi README
Using memtester
Usage is simple for the basic case. As root, run the resulting memtester binary with the following commandline:
memtester <memory> [runs]
An optional "-p physaddr" argument available to cause memtester to test
memory starting at a specific physical memory address (by mmap'ing
/dev/mem starting at an offset of `physaddr`, which is given in hex).
#以上是节选，直接跟要测试的内存的大小就可以，默认单位是M，也可以手动指定为B, K, M, or G; -p参数是指定内存物理地址的。
For example, if you want to test a bank of RAM or device which is 64kbytes in size and starts at physical
address 0x0C0000, you would run memtester as follows:
memtester -p 0x0c0000 64k [runs]
[root@localhost memtester-4.2.0]# memtester 256
memtester version 4.2.0 (32-bit)
Copyright (C) 2010 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffff000
want 256MB (268435456 bytes)
got 256MB (268435456 bytes), trying mlock ...locked.
Loop 1:
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
注：测试结果仅仅截取了一部分。我测试的过程中，使用的机器内存为1G，swap分区为4G。首次测试时，将测试的内存大小指为1G，机器死机。个人认为是由于memtester将内存全部占用导致的。
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