search for: randwrite

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 (f=1): [w(1)][1...

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 > >

...one seqwrite-libaio 141(MiB/s) > > > > 9p-cache-none seqwrite-libaio-multi 119(MiB/s) > > virtiofs-cache-none seqwrite-libaio-multi 242(MiB/s) > > virtiofs-dax-cache-none seqwrite-libaio-multi 505(MiB/s) > > > > 9p-cache-none randwrite-psync 27(MiB/s) > > virtiofs-cache-none randwrite-psync 34(MiB/s) > > virtiofs-dax-cache-none randwrite-psync 189(MiB/s) > > > > 9p-cache-none randwrite-psync-multi 137(MiB/s) > > virtiofs-cache-none randwrite-psync-multi 1...

...one seqwrite-libaio 141(MiB/s) > > > > 9p-cache-none seqwrite-libaio-multi 119(MiB/s) > > virtiofs-cache-none seqwrite-libaio-multi 242(MiB/s) > > virtiofs-dax-cache-none seqwrite-libaio-multi 505(MiB/s) > > > > 9p-cache-none randwrite-psync 27(MiB/s) > > virtiofs-cache-none randwrite-psync 34(MiB/s) > > virtiofs-dax-cache-none randwrite-psync 189(MiB/s) > > > > 9p-cache-none randwrite-psync-multi 137(MiB/s) > > virtiofs-cache-none randwrite-psync-multi 1...

...ZFS dataset that honors sync requests I can indeed see that "strict sync = not" doesn't honor the sync request, similarly to ZFS. So to summarize, this is the situation: 1) I run a fio benchmark requesting, small, random, async writes. Command is "fio --direct=1 --sync=0 --rw=randwrite --bs=4K --numjobs=1 --iodepth=1 --runtime=60 --group_reporting --name=sambatest --size=32k --time_based". I run this command on both the host, as on the Samba client, both on the same exact ZFS dataset 2) The ZFS dataset only writes async, converting sync to async writes at all times 3) That...

...ature. == Hardware == CPU: Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz Mem: 2GB SSD: Intel X25-M 120GB (Test Partition: 60GB) == config file == [global] ioengine=psync direct=1 bs=4k size=32G runtime=60 directory=/mnt/btrfs/ filename=testfile group_reporting thread [file1] numjobs=1 # 2 4 rw=randwrite == result (KBps) == write 1 2 4 lock 24936 24738 24726 nolock 24962 30866 32101 == result (iops) == write 1 2 4 lock 6234 6184 6181 nolock 6240 7716 8025 Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> --- fs/btrfs/inode.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11...

...sion 4.9.5-Debian (Buster), protocol SMB3_11. Kernel version 5.0.15. To illustrate, when I do a random sync write benchmark on the host on this dataset, it will use RAM to do the write, drastically speeding up random writes. The below benchmark command on the ZFS host: fio --direct=1 --sync=1 --rw=randwrite --bs=4k --numjobs=1 --iodepth=1 --runtime=60 --group_reporting --name=sambatest --time_based Has an average speed of 520MB/s (which is the maximum speed of my SATA SSD). Despite requesting a sync write, ZFS turns it in an async write, dramatically speeding it up. Clearly the results are great when...

...equest.) Some details about my setup: I am testing for-linus Chris''s branch I have one subvolume with 8 large files (10GB each). I am running two fio processes (one per file, so only 2 out of 8 files are involved) with 8 threads each like this: fio --thread --directory=/btrfs/subvol1 --rw=randwrite --randrepeat=1 --fadvise_hint=0 --fallocate=posix --size=1000m --filesize=10737418240 --bsrange=512b-64k --scramble_buffers=1 --nrfiles=1 --overwrite=1 --ioengine=sync --filename=file-1 --name=job0 --name=job1 --name=job2 --name=job3 --name=job4 --name=job5 --name=job6 --name=job7 The files are pre...

Hi, On Fri, 19 Jul 2019 23:26:55 +0000, douxevip wrote: > So to summarize, this is the situation: > > 1) I run a fio benchmark requesting, small, random, async writes. Command is "fio --direct=1 --sync=0 --rw=randwrite --bs=4K --numjobs=1 --iodepth=1 --runtime=60 --group_reporting --name=sambatest --size=32k --time_based". I run this command on both the host, as on the Samba client, both on the same exact ZFS dataset > > 2) The ZFS dataset only writes async, converting sync to async writes at all time...

...k/vbd/21-920 -o - > test.trace /dev/disk/vbd/21-920 is the software raid contains 2 lv volumes , each lv volume created in big srp attached disk Inside vm i try to do some work via fio: [global] rw=randread size=128m directory=/tmp ioengine=libaio iodepth=4 invalidate=1 direct=1 [bgwriter] rw=randwrite iodepth=32 [queryA] iodepth=1 ioengine=mmap direct=0 thinktime=3 [queryB] iodepth=1 ioengine=mmap direct=0 thinktime=5 [bgupdater] rw=randrw iodepth=16 thinktime=40 size=128m After that i try to get graph like iowatcher -t test.trace -o trace.svg But svg contains unreadable images. What i doing...

...<samba at lists.samba.org> wrote: > Hi, > > On Fri, 19 Jul 2019 23:26:55 +0000, douxevip wrote: > > > So to summarize, this is the situation: > > > > 1. I run a fio benchmark requesting, small, random, async writes. Command is "fio --direct=1 --sync=0 --rw=randwrite --bs=4K --numjobs=1 --iodepth=1 --runtime=60 --group_reporting --name=sambatest --size=32k --time_based". I run this command on both the host, as on the Samba client, both on the same exact ZFS dataset > > > > 2. The ZFS dataset only writes async, converting sync to async writes a...

...ci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on > > > > > > > > If I add "-device > > > > virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 ", the virtio > > > > disk 4k iops (randread/randwrite) would downgrade from 60k to 40k. > > > > > > > > In VM, if I rmmod virtio-console, the performance will back to normal. > > > > > > > > Any idea about this issue? > > > > > > > > I don't know this is a qemu issue or kernel...

...uster), protocol SMB3_11. Kernel version 5.0.15. > > To illustrate, when I do a random sync write benchmark on the host on this dataset, it will use RAM to do the write, drastically speeding up random writes. > The below benchmark command on the ZFS host: > fio --direct=1 --sync=1 --rw=randwrite --bs=4k --numjobs=1 --iodepth=1 --runtime=60 --group_reporting --name=sambatest --time_based > Has an average speed of 520MB/s (which is the maximum speed of my SATA SSD). Despite requesting a sync write, ZFS turns it in an async write, dramatically speeding it up. Clearly the results are great...

...--- [2] modprobe brd rd_size=2048000 (or boot with ramdisk_size=2048000) mkfs.btrfs -m raid0 /dev/ram0 /dev/ram1 mount /dev/ram0 /mnt -o discard fio testcase umount /mnt --- [3] testcase [global] directory=/mnt rw=randread size=256m ioengine=libaio iodepth=4 invalidate=1 direct=1 [bgwriter] rw=randwrite iodepth=32 [queryA] iodepth=1 ioengine=mmap thinktime=3 [queryB] iodepth=1 ioengine=mmap thinktime=1 [bgupdater] rw=randrw iodepth=16 thinktime=1 size=32m -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordom...