On Mon, Apr 25, 2022 at 02:00:32PM +0100, Daire Byrne wrote: > On Mon, 21 Feb 2022 at 13:59, Daire Byrne <daire@xxxxxxxx> wrote: > > > > On Fri, 18 Feb 2022 at 07:46, NeilBrown <neilb@xxxxxxx> wrote: > > > I've ported it to mainline without much trouble. I started some simple > > > testing (parallel create/delete of the same file) and hit a bug quite > > > easily. I fixed that (eventually) and then tried with more than 1 CPU, > > > and hit another bug. But then it was quitting time. If I can get rid > > > of all the easy to find bugs, I'll post it with a CC to you, and you can > > > find some more for me! > > > > That would be awesome! I have a real world production case for this > > and it's a pretty heavy workload. If that doesn't shake out any bugs, > > nothing will. > > > > The only caveat being that it will likely be restricted to NFSv3 > > testing due to the concurrency limitations with NFSv4.1+ (from the > > other thread). > > > > Daire > > Just to follow up on this again - I have been using Neil's patch for > parallel file creates (thanks!) but I'm a bit confused as to why it > doesn't seem to help in my NFS re-export case. > > With the patch, I can achieve much higher parallel (multi process) > creates directly on my re-export server to a high latency remote > server mount, but when I re-export that to multiple clients, the > aggregate create rate again degrades to that which we might expect > either without the patch or if there was only one process creating the > files in sequence. > > My assumption was that the nfsd threads of the re-export server would > act as multiple independent processes and it's clients would be spread > across them such that they would also benefit from the parallel > creates patch on the re-export server. So I expected many clients > creating files in the same directory would achieve much higher > aggregate performance. That's the idea. I've lost track, where's the latest version of Neil's patch? --b. > > Am I missing some other interaction here that limits parallel > performance in my unusual re-export case? > > Cheers, > > Daire
