Re: many processes stuck in "hmrrcm", system unusable
Matthew Dillon wrote:
> :
> :On chlamydia I have many processes stuck in "hmrrcm", making the system
> :unusable - can't open new shells, etc. After a minute or two the
> :situation seems to improve again.
>
> This is an inode moderation mechanic which will typically occur if
> large numbers (thousands) of inodes have been dirtied and need to
> be updated on-media. It prevents hammer's inode structure allocations
> from blowing away kernel memory and crashing the system.
>
> A rm -rf or a tar extract is the most typical culprit but atime
> updates can create issues as well if large portions of the filesystem
> are being randomly read. You can try mounting noatime to address
> atime issues.
Shouldn't we rather try to fix the issue, i.e. make hammer work just a
little bit performant and capable of concurrent use? I think now that
the code is stable we should start investigating performance (latency)
issues and address them.
cheers
simon
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