由于OVZ架构的VPS存在超售的问题，商家分配给我们的内存和他们标称的内存并不是一致的。很多情况都有超售，看超售严重不严重完全看商家了。对于ovz架构的vps可以对内存进行数据写入，看看是否在我们的期望值内。
相关命令：
查看初始内存
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free -m |
切换至内存目录
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cd /dev/shm |
进行数据写入，标识 count=100 为写入100M，这里在服务商提供的标识数据内，自行进行数据增长
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dd if=/dev/zero of=./memtest bs=1M count=100 |
完成后，执行删除
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rm ./memtest |
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<strong>演示</strong> |
测试机： 标识内存1G，突发内存1G的OVZ架构机器
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[root@LeafRainyK ~]# free -m total used free shared buffers cached Mem: 1024 35 988 0 0 14 -/+ buffers/cache: 20 1003 Swap: 1024 0 1024 |
这里可以看到只使用了35M
然后对内存进行数据写入
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[root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=100 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 0.0277696 seconds, 3.8 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 135 888 0 0 14 -/+ buffers/cache: 120 903 Swap: 1024 0 1024 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=200 200+0 records in 200+0 records out 209715200 bytes (210 MB) copied, 0.0550656 seconds, 3.8 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 235 788 0 0 14 -/+ buffers/cache: 220 803 Swap: 1024 0 1024 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=300 300+0 records in 300+0 records out 314572800 bytes (315 MB) copied, 0.0824703 seconds, 3.8 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 335 688 0 0 14 -/+ buffers/cache: 320 703 Swap: 1024 0 1024 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=400 400+0 records in 400+0 records out 419430400 bytes (419 MB) copied, 0.111988 seconds, 3.7 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 435 588 0 0 14 -/+ buffers/cache: 420 603 Swap: 1024 0 1024 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=500 500+0 records in 500+0 records out 524288000 bytes (524 MB) copied, 0.139541 seconds, 3.8 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 532 491 0 0 14 -/+ buffers/cache: 517 506 Swap: 1024 2 1021 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=600 dd: writing `./memtest': No space left on device 512+0 records in 511+0 records out 536866816 bytes (537 MB) copied, 0.146447 seconds, 3.7 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 544 479 0 0 14 -/+ buffers/cache: 529 494 Swap: 1024 2 1021 [root@LeafRainyK shm]# dd if=/dev/zero of=./memtest bs=1M count=700 dd: writing `./memtest': No space left on device 512+0 records in 511+0 records out 536866816 bytes (537 MB) copied, 0.142527 seconds, 3.8 GB/s [root@LeafRainyK shm]# free -m total used free shared buffers cached Mem: 1024 543 480 0 0 14 -/+ buffers/cache: 528 495 Swap: 1024 3 1020 |
从这里可以看出，内存在达到540左右时就不再增长，那么这台机器实际可以使用的内存大概在540M
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那检测到实际内存和出售的不符合,能怎么办呢?发TK谴责么?