Understanding applications using the BSC performance tools

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1 Understanding applications using the BSC performance tools Judit Gimenez German

2 Humans are visual creatures Films or books? Two hours vs. days (months) Memorizing a deck of playing cards Each card translated to an image (person, action, location) Our brain loves pattern recognition What do you see on the pictures? PROCESS STORE IDENTIFY

3 Our Tools Since 1991 Based on traces Open Source Core tools: Paraver (paramedir) offline trace analysis Dimemas message passing simulator Extrae instrumentation Focus Detail, variability, flexibility Behavioral structure vs. syntactic structure Intelligence: Performance Analytics

4 Paraver VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

5 Paraver: Performance data browser Raw data Trace visualization/analysis + trace manipulation Timelines Goal = Flexibility No semantics Programmable 2/3D tables (Statistics) Comparative analyses Multiple traces Synchronize scales

6 Timelines Each window displays one view Piecewise constant function of time s ( t) S, i t, t i i i 1 Types of functions Categorical State, user function, outlined routine S i 0, n N, n Logical In specific user function, In MPI call, In long MPI call S i 0,1 Numerical IPC, L2 miss ratio, Duration of MPI call, duration of computation burst S i R

7 Tables: Profiles, histograms, correlations From timelines to tables MPI calls profile MPI calls Histogram Useful Duration Useful Duration

8 Analyzing variability through histograms and timelines SPECFEM3D Useful Duration IPC Instructions L2 miss ratio

9 Analyzing variability through histograms and timelines By the way: six months later. Useful Duration IPC Instructions L2 miss ratio

10 From tables to timelines Where in the timeline do the values in certain table columns appear? ie. want to see the time distribution of a given routine?

11 Variability is everywhere CESM: 16 processes, 2 simulated days Histogram useful computation duration shows high variability How is it distributed? Dynamic imbalance In space and time Day and night. Season?

12 Trace manipulation Data handling/summarization capability Filtering Subset of records in original trace By duration, type, value, Filtered trace IS a paraver trace and can be analysed with the same cfgs (as long as needed data kept) Cutting All records in a given time interval Only some processes Software counters Summarized values computed from those in the original trace emitted as new even types #MPI calls, total hardware count, 570 s 2.2 GB MPI, HWC 570 s 5 MB 4.6 s 36.5 MB WRF-NMM Peninsula 4km 128 procs

13 Dimemas VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

14 Efficiency VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING Dimemas: Coarse grain, Trace driven simulation Simulation: Highly non linear model MPI protocols, resources contention Parametric sweeps On abstract architectures On application computational regions What if analysis Ideal machine (instantaneous network) Estimating impact of ports to MPI+OpenMP/CUDA/ Should I use asynchronous communications? Are all parts of an app. equally sensitive to network? MPI sanity check Modeling nominal CPU CPU CPU L Local Memory CPU CPU CPU L Local Memory B CPU CPU CPU Impact of BW (L=8; B=0) L Local Memory NMM 512 ARW 512 NMM 256 ARW 256 NMM 128 ARW 128 Paraver Dimemas tandem Analysis and prediction What-if from selected time window 4ms Detailed feedback on simulation (trace)

15 Network sensitivity MPIRE 32 tasks, no network contention L = 1000µs BW = 100MB/s L = 25µs BW = 100MB/s All windows same scale L = 25µs BW = 10MB/s

16 Ideal machine The impossible machine: BW =, L = 0 Actually describes/characterizes Intrinsic application behavior Load balance problems? Dependence problems? Nehalem cluster 256 processes Allgather + sendrecv allreduce alltoall sendrec waitall Real run Ideal network

17 Models VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

18 Why scaling? LB * Ser * Trf 1,1 CG-POP mpi2s1d - 180x120 Good scalability!! Should we be happy? 1 0,9 0,8 0,7 Parallel eff LB ulb transfer 20 speed up 0,6 0, ,6 1,4 1,2 1 0,8 0,6 Efficiency Parallel eff instr. eff IPC eff * instr * IPC 0,

19 Clustering VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

20 Using Clustering to identify structure Completed Instructions IPC J. Gonzalez et al. Automatic Detection of Parallel Applications Computation Phases (IPDPS 2009)

21 serial computation bursts SPECFEM3D WRF 128 cores GROMACS Asynchronous SPMD Balanced #instr variability in IPC SPMD Repeated substructure Coupled imbalance MPMD structure Different coupled imbalance trends

22 Integrating models and analytics What if. PEPC we increase the IPC of Cluster1? 13% gain we balance Clusters 1 & 2? 19% gain

23 Tracking: scability through clustering OpenMX (strong scale from 64 to 512 tasks)

24 Folding VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

25 Folding: Detailed metrics evolution Performance of a sequential region = 2000 MIPS Is it good enough? Is it easy to improve?

26 Folding: Instantaneous CPI stack MRGENESIS Trivial fix.(loop interchange) Easy to locate? Next step? Availability of CPI stack models for production processors? Provided by manufacturers?

27 Blind optimization From folded samples of a few levels to timeline structure of relevant routines Recommendation without access to source code Harald Servat et al. Bio-inspired call-stack reconstruction for performance analysis Submitted, 2015

28 Methodology VIRTUAL INSTITUTE HIGH PRODUCTIVITY SUPERCOMPUTING

29 Performance analysis tools objective Help generate hypotheses Help validate hypotheses Qualitatively Quantitatively

30 First steps Parallel efficiency percentage of time invested on computation Identify sources for inefficiency : load balance Communication /synchronization Serial efficiency how far from peak performance? IPC, correlate with other counters Scalability code replication? Total #instructions Behavioral structure? Variability? Paraver Tutorial: Introduction to Paraver and Dimemas methodology

31 BSC Tools web site downloads Sources / Binaries Linux / windows / MAC documentation Training guides Tutorial slides Getting started Start wxparaver Help tutorials and follow instructions Follow training guides Paraver introduction (MPI): Navigation and basic understanding of Paraver operation

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