Memory usage is not correct. about wgcloud HOT 12 CLOSED

Thank you. I think you're right. I'll fix it.

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I checked the sigar data. Used includes buffers and cached
，And I've verified that it's right, with very little error

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I've verified it. Now it seems that it should be correct. You can test the code again. Maybe you can improve the code and send the improved code here later.

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Where did you get access to sigar doc, the official wiki doesn't response to me.

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I checked the sigar data. Used includes buffers and cached
，And I've verified that it's right, with very little error

With this theory, the calculation process is right.

• My machine get s 1.0GB memory in total, with 116MB free , so the used + cached/buffered is 907, leads to 907/1024 = 88% memory usage.

But as I said,

I think there maybe a more reasonable method to calculate memory usage like this with formula:
Memory Utilization (%) = 100 -(((MemFree + Buffers + Cached)*100)/maxValue)

The key point is that I think the buffered/cached memory should not be calculated into used memory, it's still can be applied for new applications. Some reference:

• Meaning of the buffers/cache line in the output of free:
  • It gives the original value for used minus the sum buffers+cached and the original value for free plus the sum buffers+cached, hence its title. These new values are often more meaningful
  • Linux (like most modern OS) will always try to use free RAM for caching stuff, so Mem: free will almost always be very low. Therefore the line -/+ buffers/cache: is shown, because it shows how much memory is free when ignoring caches; caches will be freed automatically if memory gets scarce, so they do not really matter.

I'm not a professional operations engineer and don't know how you check the memory usage of your machine in daily work. You may catch the factors I mentioned above and reconsider which way is better.

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As for the code part, I can't see the buffered/cached memory field via the decompiled sigar source code.

public class Mem implements Serializable {
  private static final long serialVersionUID = 10181L;
  long total = 0L;
  long ram = 0L;
  long used = 0L;
  long free = 0L;
  long actualUsed = 0L;
  long actualFree = 0L;
  double usedPercent = 0.0D;
  double freePercent = 0.0D;

  public Mem() {
  }
}

You may give the actualUsed /actualFree a try, they may give us a more meaningful result.

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可以用中文交流吗，我也不是专业运维工程师，也在交流和学习。
要不我们先关闭这个issue吧，等有好的解决方案时候再修复它。可以吗

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可以，我觉得 sigar 的 Mem 类提供的 actualUsed /actualFree 就挺像是修正后的已使用内存/未使用内存。得空我验证下。

用英文是因为很多名词我翻译的不好，容易理解偏差。

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上面提到的资料：

• Meaning of the buffers/cache line in the output of free:

值得一看

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另外，sigar 这个类库好老了，我看快十年没动代码了。

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