CA-409482: Using computed delay for RRD loop #6458
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LGTM! |
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Can we updraft this? |
You mean 'undraft'? I'm making more testing for it. If it works well, I will undraft it. |
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RRD loop is executed each 5 seconds. It delays fixed 5 seconds between each loop. But the loop self also consumes time (The time consuming depends on CPU's count. If there are many CPUs, the time consuming may be hundreds milliseconds). This implementation leads RRD will take an offset after several loops. Then one of RRD data lose and a gap can be observed on XenCenter performance graph. The solution is to use a fixed deadline as each iteration start time and to use a computed delay (timeslice - loop time consuming) instead of fixed delay. Signed-off-by: Bengang Yuan <[email protected]>
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RRD loop is executed each 5 seconds. It delays fixed 5 seconds between each loop. But the loop self also consumes time (The time consuming depends on CPU's count. If there are many CPUs, the time consuming may be hundreds milliseconds). This implementation leads RRD will take an offset after several loops. Then one of RRD data lose and a gap can be observed on XenCenter performance graph.
The solution is to use computed delay (timeslice - loop time consuming) instead of fixed delay.