I use the Logstash exec plugin to dump info about our running database process every 10s. This has worked fine over the last weeks, but now on one host it failed to report data. Checking the Logstash logs, I see this error repeated every 10s (reformatted for readability): [2019-05-27T13:29:30,129]…

"Cannot allocate memory" in Logstash exec plugin

Dheeraj_Gupta (Dheeraj) May 29, 2019, 12:57pm 4

I have no performance or foot-print comparisons.

But here's an old thread for logstash 2.x which states TCP is 5x times faster than unix.

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