Limitations #288
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Limitations #288
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jasnell
reviewed
Oct 17, 2020
| applicatiions using the `http` module. | ||
| Nevertheless, it uses significant more CPU than other tools that compiles to a binary such as `wrk`. | ||
| Autocannon can saturate the CPU, e.g. the autocannon process reaches 100%: in those cases | ||
| we recommend to use `wrk`. |
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In saturation cases, I've also run autocannon from an adjacent machine. You've got to account for network latency but once you do the perf analysis still works.
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Unfortunately it can still happen that autocannon saturates the CPU.
Let's make an example with 1000 connections on my dedicated server with 4 cores with hyperthreading:
- wrk uses 2 threads + an auxiliary one to collect data: 20% + 20% + 40% cpu load.
- autocannon uses one thread at 80% cpu load.
Both saturates a Node.js process at around 41k req/sec, however wrk could potentially create more load due to its multi threading nature (because the server has plenty of CPU power available).
(I will include this example)
The solution is to use piscina and run workers!
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Explain a bit more the implied limitations of autocannon.