On 15.01.2018 18:50, Anton Aylward wrote:
Is JFS multi-threaded?
I think so: # lvcreate -L 1G -n jfstest system # mkfs.jfs /dev/system/jfstest # mount /dev/system/jfstest /mnt # ps -ef |grep jfs root 5485 2 0 19:30 ? 00:00:00 [jfsIO] root 5486 2 0 19:30 ? 00:00:00 [jfsCommit] root 5487 2 0 19:30 ? 00:00:00 [jfsCommit] root 5488 2 0 19:30 ? 00:00:00 [jfsCommit] root 5489 2 0 19:30 ? 00:00:00 [jfsCommit] root 5490 2 0 19:30 ? 00:00:00 [jfsSync] I have 4 CPUs and there are some kernel threads for jfs. If i mount another jfs filesystem, the number of kernel threads remains the same. How JFS works with parallel workload, you will have to try yourself.