Re: Throughput questions....

Philipp Eppelt <[email protected]> Wed, 13 Nov 2024 10:13:49 +0100

Newsgroups	gmane.comp.micro-kernel.l4.devel
Message-ID	<[email protected]>

Hi Richard,

Am 07.11.24 um 14:36 schrieb Richard Clark:

> I seem to be getting only 4000 messages per second. Or roughly 4 messages per millisecond. Now there are
> a couple malloc() and free() and condition_wait() and condition_signal()s going on as the events and messages
> get passed through the sender and receiver threads, but nothing (IMHO) that should slow things down too much.
> Messages are very small, like 50 bytes, as I'm really just trying to get a handle on basic overhead. So pretty much,
> yes, I'm beating the context-switching mechanisms to death...

Please note, that condition_wait / condition_signal might use L4::Semaphore to 
synchronize the threads, which is an additional microkernel interaction / 
context switch.

> 
> My questions:
> Is this normal(ish) throughput for a single-core x86_64 QEMU system?
Benchmarking on Qemu might give you a ballpark number, but QEMU performance 
depends on several factors like load on the host machine, linux scheduling, etc. 
This has the effect that the number of instructions-per-cycle execute in a time 
slice on a QEMU CPU vary.

> 
> And lastly...
> We are going to be signing up for training soon... do you have a recommendation for a big beefy AMD-based linux laptop?
If you plan on using virtualization in your setup, please be aware that the 
AMD-SVM support is experimental and needs more work to be ready for a production 
environment. Intel-VMX is supported.


Cheers,
Philipp

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