Re: [Gluster-users] Slow performance - 4 hosts, 10 gigabit ethernet, Gluster 3.2.3
On Friday 09 September 2011 10:30 AM, Thomas Jackson wrote: Hi everyone, Hello Thomas, Try the following: 1. In the fuse volume file, try: Under write-behind: option cache-size 16MB Under read-ahead: option page-count 16 Under io-cache: option cache-size=64MB 2. Did you get 9Gbits/Sec with iperf with a single thread or multiple threads? 3. Can you give me the output of: sysctl -a | egrep 'rmem|wmem' 4. If it is not a problem for you, can you please create a pure distribute setup (instead of distributed-replicate) and then report the numbers? 5. What is the inode size with which you formatted you XFS filesystem ? This last point might not be related to your throughput problem, but if you are planning to use this setup for a large number of files, you might be better off using an inode size of 512 instead of the default 256 bytes. To do that, your mkfs command should be: mkfs -t xfs -i size=512 /dev/disk device Pavan I am seeing slower-than-expected performance in Gluster 3.2.3 between 4 hosts with 10 gigabit eth between them all. Each host has 4x 300GB SAS 15K drives in RAID10, 6-core Xeon E5645 @ 2.40GHz and 24GB RAM running Ubuntu 10.04 64-bit (I have also tested with Scientific Linux 6.1 and Debian Squeeze - same results on those as well). All of the hosts mount the volume using the FUSE module. The base filesystem on all of the nodes is XFS, however tests with ext4 have yielded similar results. Command used to create the volume: gluster volume create cluster-volume replica 2 transport tcp node01:/mnt/local-store/ node02:/mnt/local-store/ node03:/mnt/local-store/ node04:/mnt/local-store/ Command used to mount the Gluster volume on each node: mount -t glusterfs localhost:/cluster-volume /mnt/cluster-volume Creating a 40GB file onto a node's local storage (ie no Gluster involvement): dd if=/dev/zero of=/mnt/local-store/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 92.9264 s, 451 MB/s Getting the same file off the node's local storage: dd if=/mnt/local-store/test.file of=/dev/null 4194304 bytes (42 GB) copied, 81.858 s, 512 MB/s 40GB file onto the Gluster storage: dd if=/dev/zero of=/mnt/cluster-volume/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 226.934 s, 185 MB/s Getting the same file off the Gluster storage dd if=/mnt/cluster-volume/test.file of=/dev/null 4194304 bytes (42 GB) copied, 661.561 s, 63.4 MB/s I have also tried using Gluster 3.1, with similar results. According to the Gluster docs, I should be seeing roughly the lesser of the drive speed and the network speed. The network is able to push 0.9GB/sec according to iperf so that definitely isn't a limiting factor here, and each array is able to do 400-500MB/sec as per above benchmarks. I've tried with/without jumbo frames as well, which doesn't make any major difference. The glusterfs process is using 120% CPU according to top, and glusterfsd is sitting at about 90%. Any ideas / tips of where to start for speeding this config up? Thanks, Thomas ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Slow performance - 4 hosts, 10 gigabit ethernet, Gluster 3.2.3
Hi Pavan, Thanks for the reply - my comments inline below Regards, Thomas -Original Message- From: Pavan T C [mailto:t...@gluster.com] Sent: Wednesday, 14 September 2011 9:19 PM To: Thomas Jackson Cc: gluster-users@gluster.org Subject: Re: [Gluster-users] Slow performance - 4 hosts, 10 gigabit ethernet, Gluster 3.2.3 On Friday 09 September 2011 10:30 AM, Thomas Jackson wrote: Hi everyone, Hello Thomas, Try the following: 1. In the fuse volume file, try: Under write-behind: option cache-size 16MB Under read-ahead: option page-count 16 Under io-cache: option cache-size=64MB TJ: Results here are not pretty! root@my-host:~# dd if=/dev/zero of=/mnt/cluster-volume/test.file bs=1M count=1 1048576 bytes (10 GB) copied, 107.888 s, 97.2 MB/s 2. Did you get 9Gbits/Sec with iperf with a single thread or multiple threads? TJ: Single thread 3. Can you give me the output of: sysctl -a | egrep 'rmem|wmem' TJ: root@my-host:~# sysctl -a | egrep 'rmem|wmem' error: permission denied on key 'vm.compact_memory' vm.lowmem_reserve_ratio = 256 256 32 error: permission denied on key 'net.ipv4.route.flush' net.core.wmem_max = 131071 net.core.rmem_max = 131071 net.core.wmem_default = 126976 net.core.rmem_default = 126976 net.ipv4.tcp_wmem = 409616384 4194304 net.ipv4.tcp_rmem = 409687380 4194304 net.ipv4.udp_rmem_min = 4096 net.ipv4.udp_wmem_min = 4096 error: permission denied on key 'net.ipv6.route.flush' 4. If it is not a problem for you, can you please create a pure distribute setup (instead of distributed-replicate) and then report the numbers? TJ: I've been able to do this with 2 hosts, while I was at it I also tested a pure replica and pure stripe setup for comparison Distribute = 313 MB/sec Replica = 166 MB/sec Stripe = 529 MB/sec 5. What is the inode size with which you formatted you XFS filesystem ? This last point might not be related to your throughput problem, but if you are planning to use this setup for a large number of files, you might be better off using an inode size of 512 instead of the default 256 bytes. To do that, your mkfs command should be: mkfs -t xfs -i size=512 /dev/disk device TJ: This is destined for use with VM images, probably a maximum of 200 files total. That said, I have tried with a bigger inode size and also with ext4 with very similar results each time In a totally bizarre turn of events, turning on port bonding (each host has 2x 10gig storage ports) in ACTIVE/BACKUP mode has increased the speed a fair bit dd if=/dev/zero of=/mnt/cluster-volume/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 176.459 s, 238 MB/s I have noticed that the inodes are getting very frequently locked/unlocked by the afs from some brief debugging, not sure if that is related Pavan I am seeing slower-than-expected performance in Gluster 3.2.3 between 4 hosts with 10 gigabit eth between them all. Each host has 4x 300GB SAS 15K drives in RAID10, 6-core Xeon E5645 @ 2.40GHz and 24GB RAM running Ubuntu 10.04 64-bit (I have also tested with Scientific Linux 6.1 and Debian Squeeze - same results on those as well). All of the hosts mount the volume using the FUSE module. The base filesystem on all of the nodes is XFS, however tests with ext4 have yielded similar results. Command used to create the volume: gluster volume create cluster-volume replica 2 transport tcp node01:/mnt/local-store/ node02:/mnt/local-store/ node03:/mnt/local-store/ node04:/mnt/local-store/ Command used to mount the Gluster volume on each node: mount -t glusterfs localhost:/cluster-volume /mnt/cluster-volume Creating a 40GB file onto a node's local storage (ie no Gluster involvement): dd if=/dev/zero of=/mnt/local-store/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 92.9264 s, 451 MB/s Getting the same file off the node's local storage: dd if=/mnt/local-store/test.file of=/dev/null 4194304 bytes (42 GB) copied, 81.858 s, 512 MB/s 40GB file onto the Gluster storage: dd if=/dev/zero of=/mnt/cluster-volume/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 226.934 s, 185 MB/s Getting the same file off the Gluster storage dd if=/mnt/cluster-volume/test.file of=/dev/null 4194304 bytes (42 GB) copied, 661.561 s, 63.4 MB/s I have also tried using Gluster 3.1, with similar results. According to the Gluster docs, I should be seeing roughly the lesser of the drive speed and the network speed. The network is able to push 0.9GB/sec according to iperf so that definitely isn't a limiting factor here, and each array is able to do 400-500MB/sec as per above benchmarks. I've tried with/without jumbo frames as well, which doesn't make any major difference. The glusterfs process
[Gluster-users] Slow performance - 4 hosts, 10 gigabit ethernet, Gluster 3.2.3
Hi everyone, I am seeing slower-than-expected performance in Gluster 3.2.3 between 4 hosts with 10 gigabit eth between them all. Each host has 4x 300GB SAS 15K drives in RAID10, 6-core Xeon E5645 @ 2.40GHz and 24GB RAM running Ubuntu 10.04 64-bit (I have also tested with Scientific Linux 6.1 and Debian Squeeze - same results on those as well). All of the hosts mount the volume using the FUSE module. The base filesystem on all of the nodes is XFS, however tests with ext4 have yielded similar results. Command used to create the volume: gluster volume create cluster-volume replica 2 transport tcp node01:/mnt/local-store/ node02:/mnt/local-store/ node03:/mnt/local-store/ node04:/mnt/local-store/ Command used to mount the Gluster volume on each node: mount -t glusterfs localhost:/cluster-volume /mnt/cluster-volume Creating a 40GB file onto a node's local storage (ie no Gluster involvement): dd if=/dev/zero of=/mnt/local-store/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 92.9264 s, 451 MB/s Getting the same file off the node's local storage: dd if=/mnt/local-store/test.file of=/dev/null 4194304 bytes (42 GB) copied, 81.858 s, 512 MB/s 40GB file onto the Gluster storage: dd if=/dev/zero of=/mnt/cluster-volume/test.file bs=1M count=4 4194304 bytes (42 GB) copied, 226.934 s, 185 MB/s Getting the same file off the Gluster storage dd if=/mnt/cluster-volume/test.file of=/dev/null 4194304 bytes (42 GB) copied, 661.561 s, 63.4 MB/s I have also tried using Gluster 3.1, with similar results. According to the Gluster docs, I should be seeing roughly the lesser of the drive speed and the network speed. The network is able to push 0.9GB/sec according to iperf so that definitely isn't a limiting factor here, and each array is able to do 400-500MB/sec as per above benchmarks. I've tried with/without jumbo frames as well, which doesn't make any major difference. The glusterfs process is using 120% CPU according to top, and glusterfsd is sitting at about 90%. Any ideas / tips of where to start for speeding this config up? Thanks, Thomas ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
