On Mon, Oct 28, 2013 at 02:22:16PM -0700, Jordan Hubbard wrote: > > On Oct 28, 2013, at 2:28 AM, Slawa Olhovchenkov <slw_at_zxy.spb.ru> wrote: > > > As I see ZFS cretate seperate thread for earch txg writing. > > Also for writing to L2ARC. > > As result -- up to several thousands threads created and destoyed per > > second. And hundreds thousands page allocations, zeroing, maping > > unmaping and freeing per seconds. Very high overhead. > > How are you measuring the number of threads being created / destroyed? This claim seems erroneous given how the ZFS thread pool mechanism actually works (and yes, there are thread pools already). > > It would be helpful to both see your measurement methodology and the workload you are using in your tests. Semi-indirect. dtrace -n 'fbt:kernel:vm_object_terminate:entry { _at_traces[stack()] = count(); }' After some (2-3) seconds kernel`vnode_destroy_vobject+0xb9 zfs.ko`zfs_freebsd_reclaim+0x2e kernel`VOP_RECLAIM_APV+0x78 kernel`vgonel+0x134 kernel`vnlru_free+0x362 kernel`vnlru_proc+0x61e kernel`fork_exit+0x11f kernel`0xffffffff80cdbfde 2490 I don't have user process created threads nor do fork/exit.Received on Mon Oct 28 2013 - 20:30:07 UTC
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