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内存涨价潮下,Linux运维如何快速筛掉不良内存条?

  • 2026-02-01 14:23:32
内存涨价潮下,Linux运维如何快速筛掉不良内存条?
最近内存条的市场行情把大家都整懵了。基本上是一天一个价,甚至出现了有钱难拿货的情况。涨价潮背后,不少翻新条、残次品趁机流入市场,用不了几天就蓝屏、重启,给我们这些运维牛马带来了很不爽的感觉。
如果有物理机器的运维,收到新内存条后,先别急着上机部署,花点时间做一轮基础测试,基本能避开绝大多数不良品。之前有篇文章大概提到过:Linux 性能剖析:CPU / 内存 / 网络 / I/O 压力测试指南 但当时写的不够详细,当时的内存也没涨得这么疯狂。
下面就分享3个最简单、零门槛的测试方法,不用复杂配置,咔咔咔搞定再也不用出了故障再骂采购部了。如果在windows上好像是有个TM5工具,但说实话,我没用过,手头上可以测试的也只有Linux系统,所以windows下的测试不在本篇讨论范围。
测试前提:关闭无关后台服务,避免其他进程占用内存,影响测试准确性。这也是测试硬件基操了。不用说大家也知道,说了也是凑字数而已。
方法1:系统自带命令dd快速初筛。dd是几乎所有Linux发行版都自带命令,反正我没遇到过没这命令的发行版。用它通过从内存零设备读数据、写入空设备的操作,能快速测试内存的基础读写稳定性。如果这一步都通不过,内存条直接甩回给采购部,不然后面有你受的。
dd if=/dev/zero of=/dev/null bs=4096 count=1048576
测试说明:
  • if=/dev/zero:从内存零设备读取数据(相当于生成空白数据);
  • of=/dev/null:写入空设备(相当于丢弃数据,只测试内存传输);
  • bs=4096:每次读写4KB数据;
  • count=1048576:总共读写1048576次,合计测试4GB内存(4096*1048576=4294967296字节=4GB),根据实际情况调整。
我这里实测命令秒级完成,会显示类似“1048576+0 records in 1048576+0 records out 4294967296 bytes (4.3 GB, 4.0 GiB) copied, 1.14088 s, 3.8 GB/s”的信息,说明内存基础读写正常;
如果执行过程中出现“error writing”“permission denied”(排除权限问题后)等错误,直接判定为不良条,砸回给采购部。
方法2:memtester精准检测,方法1的dd只能做初筛,想更精准检测内存颗粒、位翻转等问题,就要上memtester工具,它可以专门针对内存稳定性测试,操作简单,输出直观,实乃居家旅行必备良药。
# 安装memtester(以Debian系统为例):apt-get update && apt-get install memtester # 执行测试:memtester 102
测试说明:
  • 10M:测试10M内存(我这里是演示,为了省时间只测试10M,测试的时候需要根据实际内存大小调整,建议留出2GB给系统,比如16GB内存测14000M);
  • 2:测试2个循环(循环次数越多,检测越全面,我这里演示就2次,实际环境酌情增加)。
测试过程中如果全程显示ok,没有任何FAIL、error提示,说明内存稳定。如果出现一次“FAIL”,直接判定为不良条,比如显示“FAILURE: 0x00000000 != 0x00000001 at offset 0x139ba4e00”,代表该内存地址存在位翻转问题,无法正常使用。
方法3:MemTest86+终极验证,如果前两种方法测试正常,且有时间(想摸鱼的),那就用专业的MemTest86+做离线测试。
apt-get install memtest86+ 
可以看到,安装的最后它提示:正在为UEFI固件设置添加启动菜单项...
这玩意需要重启系统用它添加的启动项进入测试,是不是瞬间觉得高大上了?二话不说,直接重启,反正是测试环境,不用担心被迫提桶跑路。
重启后发现启动菜单多了这两项玩意,选择前面那个即可,后面那个什么串口什么的,不太懂,估计是远程调试用的?懂的大佬来指导下。然后它就开始测试了,手机拍的,将就看,不要问什么手机,问就是诺基亚!
要说创作不容易,大佬你看我这足足花了20多分钟才测试完1轮:
默认是无限测试的,不会自己停的,但我们只需要测试1轮,大概就能测出有没有问题了,测试完一轮后,会显示测试结果,有ERROR就不会显示PASS了:
结合上面3种测试方法,基本可以证明我这内存条完全正常。
再啰嗦一句,创作不易,我这都是实打实操作一次的,如果觉得这些方法实用,记得点赞并转发给身边的运维同(niu)行(ma)~

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  1. CONNECT:[ UseTime:0.000541s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000579s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000244s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000224s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000522s ]
  8. SELECT * FROM `article` WHERE `id` = 463416 LIMIT 1 [ RunTime:0.000436s ]
  9. UPDATE `article` SET `lasttime` = 1770535483 WHERE `id` = 463416 [ RunTime:0.008541s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000254s ]
  11. SELECT * FROM `article` WHERE `id` < 463416 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000438s ]
  12. SELECT * FROM `article` WHERE `id` > 463416 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004869s ]
  13. SELECT * FROM `article` WHERE `id` < 463416 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002239s ]
  14. SELECT * FROM `article` WHERE `id` < 463416 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001103s ]
  15. SELECT * FROM `article` WHERE `id` < 463416 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001064s ]
0.094519s