Messages in this thread | | | Date | Thu, 18 Oct 2001 20:13:21 +0100 | From | Mark Zealey <> | Subject | Re: 2.2.x process limits (NR_TASKS)? |
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On Thu, Oct 18, 2001 at 03:04:53PM -0400, Brian Gerst wrote:
> Gregory Ade wrote: > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA1 > > > > We're running into what appears to be a 256-process-per-user limit on one > > of our webservers, due to the number of processes running as a specific > > user for our application. I'd like to increase the process limit, and > > *THINK* that to do so i need to increase NR_TASKS in > > /usr/src/linux/include/linux/tasks.h. > > > > Is this correct? What other things do I need to watch out for when making > > this modification? > > > > Also, where can this limit be changed in 2.4.x? > > > > Thanks ahead of time. > > > > 2.2.x has a hard limit of 512 tasks on the x86 because it uses hardware > task switching. 2.4.x allows an unlimited number of tasks, and is > configurable via /proc/sys/kernel/threads-max and ulimit.
eh? why? The GDT can hold up to 2 ** 16 bytes (limit is 16-bit). Each entry is 8 bytes, that means that there are 8192 possible 'slots' in the GDT. Each process has 2 entries, an LDT and a task struct entry. Why is the limit 512? couldn't it be about 4000? (Some entries are needed for APM and other things...)
--
Mark Zealey (aka JALH on irc.openprojects.net: #zealos and many more) mark@zealos.org mark@itsolve.co.uk
UL++++>$ G!>(GCM/GCS/GS/GM) dpu? s:-@ a16! C++++>$ P++++>+++++$ L+++>+++++$ !E---? W+++>$ N- !o? !w--- O? !M? !V? !PS !PE--@ PGP+? r++ !t---?@ !X---? !R- b+ !tv b+ DI+ D+? G+++ e>+++++ !h++* r!-- y--
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