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34 KiB
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../config/options/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
Options
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/deprecated_options/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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Deprecated Options
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/branches/" class="md-nav__link">
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<span class="md-ellipsis">
|
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branches
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../config/functions_categories_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
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functions, categories and policies
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../config/func_readdir/" class="md-nav__link">
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<span class="md-ellipsis">
|
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func.readdir
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/rename_and_link/" class="md-nav__link">
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<span class="md-ellipsis">
|
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rename and link
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/cache/" class="md-nav__link">
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<span class="md-ellipsis">
|
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caching
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/readahead/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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readahead
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/inodecalc/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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inodecalc
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/threads/" class="md-nav__link">
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<span class="md-ellipsis">
|
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threads
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/pin-threads/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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pin-threads
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/link_cow/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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link_cow
|
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</span>
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/fuse_msg_size/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
fuse_msg_size
|
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</span>
|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../config/follow-symlinks/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
|
follow-symlinks
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/link-exdev/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
|
link-exdev
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/rename-exdev/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
rename-exdev
|
|
</span>
|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/symlinkify/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
symlinkify
|
|
</span>
|
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|
|
|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/nullrw/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nullrw
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
|
<a href="../config/xattr/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
xattr
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../config/nfsopenhack/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nfsopenhack
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../config/statfs/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
statfs / statvfs
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../config/flush-on-close/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
flush-on-close
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../config/export-support/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
export-support
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../error_handling/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Error Handling
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
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<a href="../runtime_interfaces/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Runtime Interfaces
|
|
</span>
|
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|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
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<a href="../remote_filesystems/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Remote Filesystems
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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<li class="md-nav__item">
|
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<a href="../tips_notes/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tips and Notes
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../known_issues_bugs/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Known Issues and Bugs
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../project_comparisons/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Project Comparisons
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item md-nav__item--active">
|
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|
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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|
|
<a href="./" class="md-nav__link md-nav__link--active">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tweaking Performance
|
|
</span>
|
|
|
|
|
|
</a>
|
|
|
|
</li>
|
|
|
|
|
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|
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|
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|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../benchmarking/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Benchmarking
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../tooling/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tooling
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item md-nav__item--nested">
|
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|
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" >
|
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|
|
|
|
<label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
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FAQ
|
|
</span>
|
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|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
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|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_14">
|
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<span class="md-nav__icon md-icon"></span>
|
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FAQ
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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|
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/reliability_and_scalability/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Reliability and Scalability
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../faq/usage_and_functionality/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Usage and Functionality
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/configuration_and_policies/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Configuration and Policies
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/compatibility_and_integration/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Compatibility and Integration
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/recommendations_and_warnings/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Recommendations and Warnings
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
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<a href="../faq/technical_behavior_and_limitations/" class="md-nav__link">
|
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|
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|
|
<span class="md-ellipsis">
|
|
Technical Behavior and Limitations
|
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</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../faq/limit_drive_spinup/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Limiting drive spinup
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
|
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|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item">
|
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<h1 id="tweaking-performance">Tweaking Performance</h1>
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<p>mergerfs is at its is a proxy and therefore its theoretical max
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performance is that of the underlying devices. However, given it is a
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FUSE based filesystem working from userspace there is an increase in
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overhead relative to kernel based solutions. That said the performance
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can match the theoretical max but it depends greatly on the system's
|
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configuration. Especially when adding network filesystems into the mix
|
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there are many variables which can impact performance. Device speeds
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and latency, network speeds and latency, concurrency and parallel
|
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limits of the hardware, read/write sizes, etc.</p>
|
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<p>While some settings can impact performance they are all <strong>functional</strong>
|
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in nature. Meaning they change mergerfs' behavior in some way. As a
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result there is no such thing as a "performance mode".</p>
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<p>If you're having performance issues please look over the suggestions
|
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below and the <a href="../benchmarking/">benchmarking section.</a></p>
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<p>NOTE: Be sure to <a href="../config/options/">read about these features</a> before
|
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changing them to understand how functionality will change.</p>
|
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<ul>
|
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<li>test theoretical performance using <code>nullrw</code> or mounting a ram disk</li>
|
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<li>increase readahead: <code>readahead=1024</code></li>
|
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<li>disable <code>security_capability</code> and/or <code>xattr</code></li>
|
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<li>increase cache timeouts <code>cache.attr</code>, <code>cache.entry</code>, <code>cache.negative_entry</code></li>
|
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<li>enable (or disable) page caching (<code>cache.files</code>)</li>
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<li>enable <code>parallel-direct-writes</code></li>
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<li>enable <code>cache.writeback</code></li>
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<li>enable <code>cache.statfs</code></li>
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<li>enable <code>cache.symlinks</code></li>
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<li>enable <code>cache.readdir</code></li>
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<li>change the number of threads available</li>
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<li>disable <code>posix_acl</code></li>
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<li>disable <code>async_read</code></li>
|
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<li>use <code>symlinkify</code> if your data is largely static and read-only</li>
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<li>use tiered cache devices</li>
|
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<li>use LVM and LVM cache to place a SSD in front of your HDDs</li>
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</ul>
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<p>If you come across a setting that significantly impacts performance
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please <a href="../support/">contact trapexit</a> so he may investigate further. Please test
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both against your normal setup, a singular branch, and with
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<code>nullrw=true</code></p>
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