Bug 232940 - Investigate poor ncsd performance reported in bug 230491
Summary: Investigate poor ncsd performance reported in bug 230491
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-bugs mailing list
URL:
Keywords: performance
Depends on: 230491
Blocks:
  Show dependency treegraph
 
Reported: 2018-11-03 16:37 UTC by Conrad Meyer
Modified: 2018-11-03 16:37 UTC (History)
2 users (show)

See Also:


Attachments

Note You need to log in before you can comment on or make changes to this bug.
Description Conrad Meyer freebsd_committer 2018-11-03 16:37:15 UTC
See comments #2, 5, 6, and 14 on bug 230491.

> The built-in caching doesn't seem useful for this case.  Enabling it results in a test run creating this unfortunate entry in top:
>
> 63957 root             9  52    0 24000K  4696K uwait  19   9:15 268.91% nscd
>
> and actually *slows down* stat(1) in my tests - /usr/src goes from 22 seconds to almost 90, and my CVS repository scan goes from 55 seconds to 2 minutes.


> Reducing thread count improves performance with nscd, but at "threads 1" it's still 52s vs 22s uncached.