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Dedicated sample thread for slow, blocking data sources #3

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tzwenn opened this issue Nov 27, 2020 · 0 comments
Open

Dedicated sample thread for slow, blocking data sources #3

tzwenn opened this issue Nov 27, 2020 · 0 comments
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enhancement New feature or request

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@tzwenn
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tzwenn commented Nov 27, 2020

When a data source has a high latency, it stalls the entire sampling thread.
We need a separate thread, that queries the slow data source at maximum interval, where the original sampler can copy its data from.

Experimental comparison of measured data latencies

source name platform blocking time
rapl:cores macOS-x86_64 40 µs
mcp:dev0ch1 linux-ppc64le 2690 µs
opal:power1 linux-ppc64le 198844 µs
@tzwenn tzwenn added the enhancement New feature or request label Nov 27, 2020
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@tzwenn