Re: Writing large build logs to NFS extremely slow?

Rick Macklem wrote:
?Felix Palmen wrote:
[stuff snipped]
>>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?
>Nope, I don't think keeping the file open would help much.
>However, if the file is opened with O_DIRECT, you could try setting
># sysctl vfs.nfs.nfs_directio_enable=1
>in the NFS client machine.
Oops, my bad..I for some reason was thinking you were using an NFSv3
mount, but you didn't say. For NFSv4, repeated open/close of the same
file will result in significant overhead. The official remedy for this would
be enabling delegations, but there were some significant issues with using
them that were only fixed recently, so you need a really up to date system
if you are going to enable delegations on the NFSv4 server.

rick

rick

> 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 ;)

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