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On Wed, 2007-11-07 at 13:38 -0500, James wrote: |
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> All, |
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> |
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> I'm writing a piece of code that requires I gather the following |
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> statistics every second: |
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> |
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> - CPU Usage (as a percentage) |
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this is an interesting one. I had to do this recently, and the only |
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place I could get the data from is /proc/stat |
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Except that the data is not in % and reading the top source code made me |
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go crosseyed! They make a simple task so complicated! |
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I ended up with this ugly ... 6 liner! |
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ifsProcStat.open ("/proc/stat"); |
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... |
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// in a loop: |
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ifsProcStat.seekg (0, std::ios::beg); |
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ifsProcStat >> strIgnore >> iUser >> iNice >> iSys >> iIdle >> iIoWait >> iIrq >> iSoftIrq; |
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iTotal = iUser + iNice + iSys + iIdle + iIoWait + iIrq + iSoftIrq; |
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fCpuIdleAct = ((float)(iIdle - iOldIdle) / (iTotal - iOldTotal)) * 100.0F; |
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iOldIdle = iIdle; |
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iOldTotal = iTotal; |
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// end of loop |
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Of course, I was looking at idle time as a % - you would be interested |
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in User time perhaps. |
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> - NIC I/O |
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> - Hard Drive I/O |
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I'll leave these up to you! |
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And of course this could be complete wrong! I would welcome any |
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comments on my bad coding :) |
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HTH, |
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-- |
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Iain Buchanan <iaindb at netspace dot net dot au> |
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Most people can do without the essentials, but not without the luxuries. |
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-- |
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gentoo-user@g.o mailing list |
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