mlocate

About

mlocate is a new locate implementation. The ‘m’ stands for “merging”: updatedb reuses the existing database to avoid rereading most of the file system, which makes updatedb faster and does not trash the system caches as much.

The locate(1) utility is intended to be completely compatible to slocate. It also attempts to be compatible to GNU locate, when it does not conflict with slocate compatibility.

Availability

mlocate tarballs are available at fedorahosted.org.

Current version: 0.26

mlocate is also included in Fedora Core 6 and later.

Bugs

Please consider reporting the bug to your distribution’s bug tracking system.

Otherwise, report bugs at https://fedorahosted.org/mlocate/. Bug reports with patches are especially welcome.

Performance

These measurements were obtained with mlocate-0.12 and slocate-2.7. Each time, a computer was booted into single-user mode and after one updatedb run data was collected using slabtop and free. The measurement method is admittedly crude, but I think the numbers represent reality quite well.

Run: real user system dentry inode buffers cached
slocate 1m32.84 0.704 2.045 134337 170778 85972 8268
mlocate, 1st 1m11.65 0.214 0.908 17766 15642 78452 21340
mlocate, 2nd 37.64 0.105 0.289 17776 15639 33996 21336
real, user, system
as reported by time
dentry, inode
number of active objects in dentrycache and ext3inode_cache, as reported by slabtop
buffers, cached
size of disk buffers and page cache, as reported by free

mlocate has two rows because the first run needs to scan the whole file system, while the subsequent runs can reuse most of the original database.

17 Responses to mlocate

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  8. Hi Miloslav,

    Would it be reasonably feasible to add file date and size in the locate database?

    Cheers,

    Alexandre

  9. mitr says:

    I’m afraid geting file data and size would require a stat() system call for each file, and it would be impossible to merge data from the previous database; the overall performance impact would be too high.

  10. krogon says:

    mlocate should include this fs in PRUNEFS: s3fs and fuse.s3fs

  11. mitr says:

    mlocate itself does not ship a configuration file, please report this in the bug tracker of your distribution.

  12. Brennan S says:

    Quick question about updatedb’s very deep hiearchy test. The path generated goes way past PATH_MAX, which causes problems with gentoo’s sandbox. To work around this I shortened the names of the directories generated to just a number, which allows the same number of directories but all with shorter names. Is this an acceptable solution, or does it defeat the purpose of the test? Thanks, Brennan

  13. mitr says:

    Well, it does defeat the purpose of the test, but building a secure user-space sandbox that doesn’t limit path length to PATH_MAX may be really difficult.

    Considering that the “real” version of the test must have succeeded before building a release tarball, limiting the test in a sandbox is a fairly reasonable approach in this case.

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  16. Hi Miloslav, Would it be reasonable to add option for colors in output (like –color in grep)? Best regards. Salvatore Picerno

  17. mitr says:

    –color would make sense; I’m afraid I don’t have time to work on it currently, filed as https://fedorahosted.org/mlocate/ticket/31 so it isn’t forgotten.

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