> On 29 July 2015, at 23:44, Peter Jeremy <pe...@rulingia.com> wrote: > > [reformatted] > > On 2015-Jul-29 17:41:33 -0700, Doug Hardie <bc...@lafn.org> wrote: >> I have several FreeBSD 9.3 systems that are using swap and I can’t >> figure out what is doing it. The key system has 6GB swap and >> currently it has over 2GB in use. > > Is the system currently paging (top(1) and "systat -v" will show > this)? If not, this just means that at some time in the past, the > system was under memory pressure and paged some process memory out. > Since then, that memory hasn't been touched so the system hasn't paged > it in. > >> ps shows only a kernel module >> [intr] with a W status. > > 'W' means the whole process is 'swapped' out - this will only occur > under severe RAM pressure. Normally, the system will just page out > inactive parts of a processes address space - and none of the ps flags > will show this. > >> How do I figure out what that swap space is being used for? > > I don't think this can be trivially done. "procstat -v" will show > the number of resident pages within each swap-backed region, any > pages in that region that have been touched but are not resident > are on the swap device but any pages that have never been touched > aren't counted at all.
Bingo. procstat shows the problem. The process that I suspected has a large number of entries like: 650 0x834c00000 0x835800000 rw- 0 0 1 0 ---- sw 650 0x835800000 0x835c00000 rw- 0 0 1 0 ---- sw 650 0x835c00000 0x837c00000 rw- 1 0 1 0 ---- sw I don’t know whats in those areas yet. If I were to kill the process with SIGABRT would the core dump show those areas? I might be able to figure out what they are from that. Thanks for the pointer. _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
