Messages in this thread | | | Date | Tue, 27 Nov 2001 09:26:17 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: a nohup-like interface to cpu affinity |
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On Mon, 26 Nov 2001, Linux maillist account wrote:
> A nohup-like interface to the cpu affinity service would be useful. It > could work like the > following example: > > $ cpuselect -c 1,3-5 gcc -c module.c
yep, this can be done via the chaff utility i posted:
gcc -c module.c & ./chaff $! 0x6
or, it can be done by changing the affinity of the current shell, every new child process will inherit it:
./chaff $$ 0x6; gcc -c module.c
(or a cpuselect utility can be written.)
> On another subject -- capabilities -- any process should be able to > reduce the number of cpus in its own cpu affinity mask without any > special permission. To add cpus to a reduced mask, or to change the > cpu affinity mask of other processes, should require the appropriate > capability, be it CAP_SYS_NICE, CAP_SYS_ADMIN, or whatever is decided.
yep, this is how sched_set_affinity() is workig - it allows the setting of affinities if either CAP_SYS_NICE is set, or the process' uid/gid matches that of the target process' effective uid/gid.
Ingo
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