I have set my siege concurrency level a bit lower (20 users) and that seems to have resolved the segfault issue. Its strange that I hadn't read anywhere else that a lack of resources could cause that, but there it is. I guess that running Debian 8, Apache 2.4.10, php-fpm and Mariadb was just a bit too much to ask of my single core 512mb VPS? On Aug 22, 2015 1:13 PM, "Kurtis Rader" <kra...@skepticism.us> wrote:
> On Fri, Aug 21, 2015 at 6:14 PM, Daryl King <allnatives.onl...@gmail.com> > wrote: > >> Thanks Ryan. Strangely when running "ulimit -n" it returns 65536 in a ssh >> session, but 1024 in webmin? Which one would be correct? >> > > Limits set by the ulimit command (and the setrlimit syscall) are correct > if they are high enough to allow a correctly functioning program to perform > its task. They are incorrect if set too low for the needs of a correctly > functioning program or so high that a malfunctioning program is able to > adversely affect the functioning of other processes. So the answer to your > question is: it depends. > > Having said that it is very unusual these days for "ulimit -n" to be set > too high. Supporting thousands of open files in a single process is > normally pretty cheap in terms of kernel memory, CPU cycles, etc. So if you > have a reason to think your program (e.g., httpd) has a legitimate need to > have more than 1024 files open simultaneously go ahead and increase the > "ulimit -n" (which is the setrlimit RLIMIT_NOFILE parameter) to a higher > value. > > However, in my experience it is unusual for a too low limit on the number > of open files to result in a segmentation fault. Especially in a well > written program like Apache HTTPD. A well written program will normally > check whether the open (or any syscall which returns a file descriptor) > failed and refuse to use the -1 value as if it were a valid file descriptor > number. So I would be surprised if increasing that value resolved the > segmentation fault. > > -- > Kurtis Rader > Caretaker of the exceptional canines Junior and Hank >
