Date: Sat, 9 Oct 2021 17:50:33 +0200 From: Felix Palmen <felix@palmen-it.de> To: freebsd-current@freebsd.org Subject: Re: Writing large build logs to NFS extremely slow? Message-ID: <20211009155033.fckg4i7zqo4yt2te@nexus.home.palmen-it.de> In-Reply-To: <YQXPR0101MB096832C878E88DF877B39DB8DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> References: <20211007021643.bwglyvrswk2nm3fl@nexus.home.palmen-it.de> <CAOgwaMsLTWaMddx1HPY0eiY4t-12x-bEiZmhUpFsuEqkNhM27w@mail.gmail.com> <20211009141852.3cmjh7tysnehum7b@nexus.home.palmen-it.de> <YQXPR0101MB096832C878E88DF877B39DB8DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM>
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* Rick Macklem <rmacklem@uoguelph.ca> [20211009 15:35]:
> Felix Palmen wrote:
> Assuming your NFS performance is acceptable for other things and it
> is only this log file that is a problem, then I doubt there is much you
> can do to improve it.
Yes, that's the only problem I found so far…
> --> Append (as in O_APPEND opens) are a poor case for NFS, since there
> is no append write in NFS. To approximate append write, it must flush
> all dirty data to the server, do a Getattr to find out the file's current
> size and then do the write (over and over and over again).
Ok, thanks for the insight here! So maybe, I could have a look at
poudriere's code? If I understand you correctly, keeping the file open
and just issuing more write() calls wouldn't trigger that problem?
> You could try the "nocto" mount option, which might help, if the log file
> is being re-opened many times, but I doubt it will help.
Well, I take any suggestion, so will try that as well and report back,
thanks again!
Side note, please don't CC/To me, I'm subscribed the list ;)
--
Dipl.-Inform. Felix Palmen <felix@palmen-it.de> ,.//..........
{web} http://palmen-it.de {jabber} [see email] ,//palmen-it.de
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