> On 05 Mar 2016, at 15:13, Eugene Grosbein <eu...@grosbein.net> wrote: > > 05.03.2016 18:21, Dmitry Sivachenko пишет: >> Hello, >> >> I am running a number of machines with /home mounted via nfs (FreeBSD >> 10.3-PRERELEASE #0 r294799, rw,bg,intr,soft). >> >> Sometimes I get the following messages in syslog: >> >> nfs_getpages: error 4 >> vm_fault: pager read error, pid NNN (myprog) >> >> After that I see I lot of processes stuck in "pfault" state (these are >> computational processes which use some files from NFS mount), they use 0% of >> CPU after that. >> >> On NFS server machine I see nothing strange in logs. procstat -kk for such >> stuck processes shows: >> PID TID COMM TDNAME KSTACK >> 85274 102056 myprog - mi_switch+0xbe >> sleepq_wait+0x3a _sleep+0x287 vm_waitpfault+0x8a vm_fault_hold+0xdd0 >> vm_fault+0x77 trap_pfault+0x180 trap+0x52c calltrap+0x8 >> >> >> What can be the reason of this? > > For example, if some processes running on NFS server box modify some files > "in-place" > and these files are opened by processes running on NFS client, that could be > the reason. > If so, change this so processes updating such files create new temporary > versions of them first > and then rename them atomically. >
This should not be the case: users are working only on NFS clients. Moreover, the nature of computations is so that each process uses it's own set of files. (Forgot to mention in my previous e-mail that these processes can't be stopped even with kill -9) _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
