Interaction of Access Patterns on the dnfsp File System Rodrigo Virote Kassick Francieli Zanon Boito Philippe O.A. Navaux

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1 [ ] Interaction of Access Patterns on the dnfsp File System Rodrigo Virote Kassick Francieli Zanon Boito Philippe O.A. Navaux GPPD Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux

2 Outline Motivation Goals Tools & Environment Tests & Results Conclusions Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 2

3 Motivation Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 3

4 HPC Applications HPC: Distributed Applications running on hundreds of Processors Great amount of Data Needs to be available as input to execution nodes Data generated as the result of simulations needs to be available after the execution Need for a high capacity and scalable storage infra-structure Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 4

5 Distributed File Systems Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 5

6 Temporal Access Pattern Applications present interleaved phases of computation & I/O Idleness during processing phases High I/O rate during Input or Output phases Constant rate of I/O Application may have a long input or output phase I/O done in the background while application executes Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 6

7 Temporal Access Pattern Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 7

8 Concurrent Execution of Applications Toulouse Site of Grid5000, Aug 2 nd - 5 th Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 8

9 Atlas LLNL, Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 9

10 Concurrent Execution of Applications Concurrent Access to a Shared Storage System Shared I/O & Network Bandwidth to the servers Any combination of access patterns Servers treating requests for several files, distinct set of clients and with variations on the demand Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 10

11 Goals Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 11

12 Access Pattern Interaction In a PFS, does the execution of several applications have influence on the I/O performance? Does the temporal behavior of applications have impact on their I/O? Test interaction of applications over a shared file system Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 12

13 Tools & Test Environment Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 13

14 Parallel File System: dnfsp Distributes data over Set of Servers IOD's NFS Protocol between clients and Meta-Servers Distributed meta-data service Proxies requests to IOD's Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 14

15 Test Environment Pastel Cluster, Toulouse site of Grid5000 Gigabit Ethernet dnfsp with 6 Servers Each acting as metaserver and IOD 24 NFS Clients divided in 2 sets: Background and Foreground Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 15

16 I/O Benchmark MPI-IO-Test v21 Writes/Reads Objects of a given Size. Optionally, waits a specified interval between each operation Only write phase Each test case repeated 6 times, standard deviation less then 10% Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 16

17 Results: I/O Bound Applications Interaction Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 17

18 I/O Bound Application Interaction Foreground and Background instances execute the same configuration of the benchmark Object Size of 128Kb Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 18

19 Total of 128Mb per node MB/s Number of Processors on background execution Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 19

20 I/O Bound Interaction Individual I/O performance is affected NFS client's contention mechanisms didn't allow clients to profit from all the bandwidth Distribution of clients on the servers affected performance Baseline Combined Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 20

21 Results: Temporal Access Pattern Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 21

22 Temporal Access Pattern Clients divided in 2 sets: Foreground: Temporal Behaviour: Waits a specified interval between each I/O operation Background: Continuous I/O 12 clients in each instance Concurrent execution during 3 minutes. Write as many objects as time allows Objects sizes of 128KB, 2MB and 4MB Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 22

23 Temporal 128KB Objects Foreground Background Combined Bandwidth ,5 Blocksize of 128k Time Ratio IO Time Total Execution Time Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 23

24 Temporal 128KB Objects Divergence after interval of 50ms Foreground bandwidth ranges from 34MB/s to 36MB/s (42MB/s peak at interval of 1s) Background ranged from 35MB/s to 65MB/s Combined bandwidth reached 100MB/s Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 24

25 Temporal 2MB Objects Foreground Background Combined Bandwidth ,5 Time Ratio Blocksize of 2Mb Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 25

26 Temporal 2MB Objects Foreground ranged from 33MB/s to 20MB/s, peaking 37MB/s at 1s Background ranged from 33MB/s to 49MB/s dnfsp whole utilization was below expected with longer writes: 88MB/s peak Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 26

27 Temporal 4MB Objects Foreground Background Combined Bandwidth ,5 Time Ratio Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 27

28 Temporal 4MB Objects Foreground ranged from 33MB/s to 21MB/s Background ranged from 33MB/s to 46MB/s Combined Bandwidth peaked ~80MB/s with 2s interval Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 28

29 Conclusions Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 29

30 Conclusions dnfsp can handle multiple application scenarios Delayed-write politics kept clients from profiting from the available I/O bandwidth Non-ideal distribution of the clients on the meta-servers causes performance issues Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 30

31 Conclusions Applications with temporal behaviour suffer degradation in I/O performance with dnfsp Background instance profits from temporal behaviour on the foreground, but performs below the expected performance. For the tested object sizes, a time ratio of 0,75 is seen as the performance-split-point of background and foreground instances. Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 31

32 [ ] Interaction of Access Patterns on the dnfsp File System Rodrigo Virote Kassick Francieli Zanon Boito Philippe O.A. Navaux GPPD Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux

33 MB/s Total of 1Gb for each application Number of Processors on background execution Conferencia Latinoamericana de Computación de Alto Rendimiento Kassick, Boito, Navaux 33

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