From: "Sigrid Solveig Haflínudóttir" <sigrid@ftrv.se>
To: 9front@9front.org
Subject: Re: [9front] Speeding up snoopy(8)
Date: Thu, 20 Oct 2022 18:03:47 +0200 [thread overview]
Message-ID: <26B1535D9EE1F3549FAB661259CC3845@ftrv.se> (raw)
In-Reply-To: <85db2d6b-e60a-4236-9a2c-5b0b77ef99f6@app.fastmail.com>
Quoth David Arroyo <droyo@aqwari.net>:
> I will experiment with putting the pwrite in a separate thread, and
> look for small performance improvements in the other functions. I
> am not sure why nsec() time is so high, but I think that's a function
> that could perform very differently on real vs virtual hardware, so
> I'm hesitant to try to improve it until I get 9front running on a
> real machine.
nsec() is a function that results in a syscall. It is also affected
by time adjustments, to my knowledge. At some point I replaced nsec()
call with a (somewhat dirty) nanosec() in vmx, see
/sys/src/cmd/vmx/nanosec.c
It would be nice to have a way to get monotonic timestamps in userspace
without having to go into the kernel. For now, you can try nanosec and
see if anything changes.
next prev parent reply other threads:[~2022-10-20 16:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 4:57 droyo
2022-10-20 15:55 ` David Arroyo
2022-10-20 16:03 ` Sigrid Solveig Haflínudóttir [this message]
2022-10-21 15:38 ` David Arroyo
2022-10-21 16:04 ` ori
2022-10-21 16:54 ` David Arroyo
2022-10-21 17:10 ` ori
2022-10-21 17:40 ` Lyndon Nerenberg (VE7TFX/VE6BBM)
2022-10-21 18:52 ` ori
2022-10-21 19:23 ` ori
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