Messages in this thread | | | From | (Alan Cox) | Subject | Re: 10,000 fds, 10,000 tasks | Date | Thu, 5 Nov 1998 00:06:46 +0000 (GMT) |
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> I have a legitimate reason to open ~10,000 files and ~10,000 tasks on an > Alpha/Linux box. (If not thousands more...)
Im intrigued
> 1) Is there a maximum amount of TASKS that I can have? I know > that this number is tunable in "tasks.h", but are there any other limits > that I should be aware of? (Can I just define it as 10,000?)
Its tunable. On some platforms (eg X86) it has a hardware limit. There shouldnt be a software one but Im not an Alpha geek
> 2) Is there a maximum amount of OPEN_FILES that I can have? > Once again, I know that this number is tunable in "fs.h" and "limits.h", > and that /proc/sys/fs/file-max exists, but are there any other limits > that I should be aware of? (I heard some rumblings about issues with > select...) (I have also heard of a 3000fds patch... Where does this > exist? )
There is a limit in 2.0 on the amount per process to do with the stack size, there is a patch to work around this. If you can't find it email me and I'll send it you off list.
> 3) On Digital Unix, we eventually run into a limit of the number of > processes because of memory. (Each process has a certain footprint, and each > new one takes a small piece of memory from the overall available) What is the > footprint of a linux process and can it be reduced?
1 page for the kernel stack, some memory for the page tables and then 1 page for the process info and sundries (like fd table) rising as you up the max files/process limit. I'd expect the numbers to be fairly similar to the values Digital Unix takes actually.
Alan
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