user:sys time ratio

Poul-Henning Kamp phk at
Sun Nov 30 06:31:02 PST 2003

In message < at>, Colin Percival
>   I've got a system running 5.2-BETA from 27/11/03, with the malloc_abort, 
>malloc_junk, DEBUG=-g, DDB, INVARIANT*, and WITNESS* debugging options 
>changed (as was done in 5.1-RELEASE).
>   When running `make buildworld`, I see large amounts of sys time; eg, 27 
>minutes user & 14 minutes sys for building 5.2, or 14 minutes user & 10 
>minutes sys for building 4.9.  I expected the ratio of user:sys to be much 
>larger than this, and mailing list traffic indicates that a 4:1 ratio is 
>typical.  (FWIW, prior to changing the debugging options, the user:sys time 
>ratio was around 1:1.)

I've seen UNIX systems have "typical" system/user splits from 1/9 to 9/1
it all depends on what you're doing.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

More information about the freebsd-current mailing list