similar to: Asynchronous IO

On Tue, Mar 20, 2018 at 8:57 AM, Sam McLeod <mailinglists at smcleod.net> wrote: > Hi Raghavendra, > > > On 20 Mar 2018, at 1:55 pm, Raghavendra Gowdappa <rgowdapp at redhat.com> > wrote: > > Aggregating large number of small writes by write-behind into large writes > has been merged on master: > https://github.com/gluster/glusterfs/issues/364 > >

Excellent description, thank you. With performance.write-behind-trickling-writes ON (default): ## 4k randwrite # fio --randrepeat=1 --ioengine=libaio --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=32 --size=256MB --readwrite=randwrite test: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32 fio-3.1 Starting 1 process Jobs: 1

2017-10-10 8:25 GMT+02:00 Karan Sandha <ksandha at redhat.com>: > Hi Gandalf, > > We have multiple tuning to do for small-files which decrease the time for > negative lookups , meta-data caching, parallel readdir. Bumping the server > and client event threads will help you out in increasing the small file > performance. > > gluster v set <vol-name> group

Firstly, it isn't necessary to hold lock of vblk->vq_lock when notifying hypervisor about queued I/O. Secondly, virtqueue_notify() will cause world switch and it may take long time on some hypervisors(such as, qemu-arm), so it isn't good to hold the lock and block other vCPUs. On arm64 quad core VM(qemu-kvm), the patch can increase I/O performance a lot with VIRTIO_RING_F_EVENT_IDX

Firstly, it isn't necessary to hold lock of vblk->vq_lock when notifying hypervisor about queued I/O. Secondly, virtqueue_notify() will cause world switch and it may take long time on some hypervisors(such as, qemu-arm), so it isn't good to hold the lock and block other vCPUs. On arm64 quad core VM(qemu-kvm), the patch can increase I/O performance a lot with VIRTIO_RING_F_EVENT_IDX

I just tried setting: performance.parallel-readdir on features.cache-invalidation on features.cache-invalidation-timeout 600 performance.stat-prefetch performance.cache-invalidation performance.md-cache-timeout 600 network.inode-lru-limit 50000 performance.cache-invalidation on and clients could not see their files with ls when accessing via a fuse mount. The files and directories were there,

Hi, These patches try to support multi virtual queues(multi-vq) in one virtio-blk device, and maps each virtual queue(vq) to blk-mq's hardware queue. With this approach, both scalability and performance on virtio-blk device can get improved. For verifying the improvement, I implements virtio-blk multi-vq over qemu's dataplane feature, and both handling host notification from each vq and

Hi, These patches try to support multi virtual queues(multi-vq) in one virtio-blk device, and maps each virtual queue(vq) to blk-mq's hardware queue. With this approach, both scalability and performance on virtio-blk device can get improved. For verifying the improvement, I implements virtio-blk multi-vq over qemu's dataplane feature, and both handling host notification from each vq and

Hi everyone, This is for Xen 2.0.3. I''m really interested in the functionality of atropos (enforcing CPU partitioning in a non work-conserving fashion). As I had reported earlier, atropos seemed broken in 2.0. It still seems broken now: $ xm list Name Id Mem(MB) CPU State Time(s) Console Domain-0 0 123 0 r---- 49.1 vm1 1 47

Hi folks, I''m trying to use the atropos scheduler with Xen. Couple of questions: - the scheduling param *has* to be specified at boot time right, or does Xen allow changing the scheduling scheme at run time?? - xm help atropos gives a very vague message at best, perhaps we could make it more elaborate: xm atropos DOM SLICE PERIOD LATENCY XTRATIME o is DOM the vm ID or the vm NAME (as

vhost-blk is an in-kernel virito-blk device accelerator. Due to lack of proper in-kernel AIO interface, this version converts guest's I/O request to bio and use submit_bio() to submit I/O directly. So this version any supports raw block device as guest's disk image, e.g. /dev/sda, /dev/ram0. We can add file based image support to vhost-blk once we have in-kernel AIO interface. There are

vhost-blk is an in-kernel virito-blk device accelerator. Due to lack of proper in-kernel AIO interface, this version converts guest's I/O request to bio and use submit_bio() to submit I/O directly. So this version any supports raw block device as guest's disk image, e.g. /dev/sda, /dev/ram0. We can add file based image support to vhost-blk once we have in-kernel AIO interface. There are

Il 17/06/2014 18:00, Ming Lei ha scritto: >> > If you want to do queue steering based on the guest VCPU number, the number >> > of queues must be = to the number of VCPUs shouldn't it? >> > >> > I tried using a divisor of the number of VCPUs, but couldn't get the block >> > layer to deliver interrupts to the right VCPU. > For blk-mq's

Il 17/06/2014 18:00, Ming Lei ha scritto: >> > If you want to do queue steering based on the guest VCPU number, the number >> > of queues must be = to the number of VCPUs shouldn't it? >> > >> > I tried using a divisor of the number of VCPUs, but couldn't get the block >> > layer to deliver interrupts to the right VCPU. > For blk-mq's

Hi Eric,Thanks for the explanation. Is there a way to save the results automatically after the analysis gets over?. As I recently lost the results, because I didn't save the results. I don't want to run the sink or save command after the analysis is over rather run the command for saving the file before starting to run the analysis, so the file gets saved automatically after the script has

Hi Eric,I tried as you suggested but I could not find the output in the text file I created (attr.txt) net <- loadNetwork("C://Users//Priya//Desktop//Attractor analysis_all genes//synaptogenesis//regulationof_dopamine_signaling_submodule3.txt")sink("C://Users//Priya//Desktop//Attractor analysis_all genes//synaptogenesis//attr.txt") sink() attr <- getAttractors(net,

Some comments: 1. sink() does not return a value. There is on point to set attr <- sink(...). Just give the command sink("C://....etc") 2. to complete the saving to the file you must give a second sink command with no argument: sink() So your code would be (pseudo-code, not actual code) sink( "filename" ) do something that prints output which will be captured by sink

Let's try a simple example. > # Create a script file of commands > # Note we must print the results of quantile explicitly > cat("x <- rnorm(50)\nprint(quantile(x))\nstem(x)\n", file="Test.R") > > # Test it by running it to the console > source("Test.R") 0% 25% 50% 75% 100% -2.4736219 -0.7915433

>From tools/libxc/xc_atropos.c: int xc_atropos_domain_set(int xc_handle, u32 domid, u64 period, u64 slice, u64 latency, int xtratime) which takes 6 arguments >From tools/python/xen/xm/main.py: class ProgAtropos(Prog): <snip> def main(self, args): if len(args) != 5: self.err("%s: Invalid argument(s)" % args[0])

Hi Priya, You did not follow the logic of the pseudo-code. The sink("filename"), sink() pair captures whatever output is generated between the first sink statement and the second sink statement. You need (possibly) to do: sink("C://Users//Priya//Desktop//Attractor analysis_all genes//synaptogenesis//attr.txt") net <- loadNetwork("C://Users//Priya//Desktop//Attractor