TMPA-2017: A Survey of High-Performance Computing for Software Verification

TMPA-2017: Tools and Methods of Program Analysis
3-4 March, 2017, Hotel Holiday Inn Moscow Vinogradovo, Moscow

A Survey of High-Performance Computing for Software Verification
Ilja Zakharov, Institute for System Programming

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Transcript

1. Institute for System Programming of the Russian Academy of Sciences A Survey of High-Performance Computing for Software Verification 2017, Moscow, Russia Ilja Zakharov ilja.zakharov@ispras.ru
2. 2 Software Verification Static verification of C programs (CEGAR, BMC, ...) LTL model checking Static analysis
3. 3 Linux Drivers Verification catc.ko cdrom.ko usbcore.ko raid1.ko etx2.ko ext3.ko rtc-lib.ko The Linux Kernel catc.ko catc.ko env env catc.ko env catc.ko env catc.ko linux:mutex generic:memory linux:clock Extract a module source code Generate an environment model Add a safety property specification
4. 4 Linux Drivers Verification Verification task Verification task Verification task Linux
5. 5 Static Verification of C Programs void main() { int x = nondet(); int y = nondet(); int z = nondet(); L1: if (x > y) { L2: z = y - x; } else { L3: z = x - y; } L4: if (z < 0) ERR: goto ERR; L5: } Enter main() x = nondet(); y = nondet(); z = nondet(); assume(x > y) z = x - y; assume(z < 0) ERR;
6. 6 Linux Driver Verification
7. 7 Verification Tasks 4500 Modules 30 Safety properties 2 Verification tool configurations 50 Sec of CPU time per verification task * * * = ?
8. 8 Verification Performance 5 months
9. 9 Verification Performance
10. 10 High-Performance Computing • Distributed computing • Multi-Core computing • GPU computing
11. 11 Distributed Verification • Verification of a single task using several nodes • Distributing tasks into several nodes
12. 12 Distributed Verification of a Single Task • Nodes explore parts of the state space • Data transfer has high latency • Modern work stations are used inefficiently Murφ SPIN ARMC DiVinE
13. 13 Distributed Verification of a Single Task • Nodes explore parts of the state space • Data transfer has high latency • Modern work stations are used inefficiently Speedup ThreadNums 1
14. 14 Distributed Verification of Several Tasks • VerifierCloud for SV-COMP annual competition Program Verdict 4 days 787 463 verification tasks, CPU wall time of 3a 27d 15h 49min 35s
15. 15 Platform as a Service • Platforms create application instances depending on current workload • An application must use the platform API • Platforms imply hard restrictions on task pending time and task solution time
16. 16 CPAchecker in GAE • Faster application startup • Pure Java SMT interpolating Solver • Specific API to access file system • Restricted time for task solution and pending
17. 17 Infrastructure as a Service • EC2, OpenStack, … • Clouds provide virtual machines • Users can adjust VM characteristics
18. 18 Multi-Core Computing • Multiple hyper-threading cores • Shared memory
19. 19 Multi-Core Verification • Parallel state space exploration • Lockless hash tables to store state space • Cache coherence may introduce significant latency DiVinE, SPIN, LTSmin BOLT (Map-Reduce)
20. 20 Multi-Core Verification • Parallel state space exploration • Lockless hash tables to store state space • Cache coherence may introduce significant latency DiVinE, SPIN, LTSmin BOLT (Map-Reduce) Speedup ThreadNums 1
21. 21 GPU Computing • Hundreds cores organized as SMX • GPU Memory hierarchy • Longer clock cycle • Separated code for GPU and CPU
22. 22 GPU Verification • Linear arithmetic • Sparse matrixes • Less system calls • CPU and GPU combination GPU-PRISM CADP DiVinE SPIN LTSmin 100 times faster than CPU using Kepler Architecture
23. 23 Few High Performance Static Verifiers • Proof of concepts available • No best solution • Difficulty of tools comparison from different classes
24. 24 Linux Driver Verification • Distributed task solution • Tasks distribution • IaaS • PaaS • Multi-core verification • GPU verification
25. 25 Ongoing Work VM VM VM VM VM Consul, DockerSwarm OpenStack CPAchecker BenchExec CPAchecker BenchExec CPAchecker BenchExec Master Scheduler Web-Interface VM TaskGenerator RunExec Client Client
26. 26 Linux Driver Verification
27. Institute for System Programming of the Russian Academy of Sciences Thank you ilja.zakharov@ispras.ru