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Re: [jetty-dev] Trying to make sense of slow server response times
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Thanks Paul.
Such spectre patches could indeed play a role here. One thing we did was
running this script: https://github.com/speed47/spectre-meltdown-checker
but it did not show any differences between the slower and faster machines.
Also if just the CPU was slower (for some reason) I still would not
understand why measureSumArray (the benchmark that just does the array
summation) is fast while measureSumArrayHttp (the one that does the same
computation via Jetty) is slow.
On 09.05.22 09:53, Paul Palaszewski wrote:
Hi,
check the bios versions. I also know that cpu microcode updates are distributed via linux but you need to google how to check those, I don’t know it. with side channel attacks like specter the cpu and bios manufacturers have been quite busy for the last years to patch what they can, usually causing severe performance impacts at first and then slightly improving again over time.
regards
Paul
Am 09.05.2022 um 09:36 schrieb easbar.mail@xxxxxxxxxx:
Regarding the GC pauses: I also tried running the benchmark using `-XX:+UseEpsilonGC` and the constant overhead remained, so it cannot be attributed to GC pauses I think.
On 09.05.22 09:01, Simone Bordet wrote:
Hi,
On Mon, May 9, 2022 at 8:03 AM <easbar.mail@xxxxxxxxxx> wrote:
Are there any Jetty settings we could try to gain more information about
the cause of the problem? Or maybe use the Jetty API in some way to
exclude certain features that might be the cause of this?
I don't think Jetty is involved at all.
Write a JMH benchmark instead of using Jetty, and run it on the
different machines.
Also, did you check the GC? It may just happen that the 7 ms you see
are a small GC pause.
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