Clarizen GC adventures during the holidays
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My talk from #reversim summit 2019 Tamir Dresher Clarizen adventures with the wild GC during the holiday season
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Clarizen GC adventures during the holidays
- 1. Clarizen adventures with the wild GC during the holiday season @tamir_dresher Chief Architect @ Clarizen
- 2. 2 Chief Architect @ @tamir_dresher Tamir Dresher My Books: Software Engineering Lecturer Ruppin Academic Center tamir.dresher@clarizen.com
- 3. CLARIZEN - ENTERPRISE WORK COLLABORATION I N T E R N A L & E X T E R N A L C O L L A B O R AT I O N A U T O M AT E D W O R K F L O W E N G I N E REPORTS & DASHBOARDS MOBILE APPS & BOTS APPSMARKETPLACE INTEGRATIONS RESOURCE MANAGEMENT TIME & EXPENSES FINANCIAL PLANNING DEMAND MANAGEMENT PROJECT MANAGEMENT PORTFOLIO MANAGEMENT ENTERPRISES FROM 124 COUNTRIES 99.95% UPTIME ENTERPRISE GRADE SaaS SOLUTION FOUNDED IN 2006
- 4. 4
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- 12. 12 .NET Garbage Collector (GC) 12 Gen 0 Gen 1 Gen 2 Gen 0 is full, start garbage collection!New objects are allocated in Gen 0Dead objects are foundStill living objects are promoted Large object heap
- 15. 15 Long PauseGen 0 GC https://github.com/microsoft/perfview
- 16. 16
- 17. 17 GC Threads 1..11 (all the same stack trace): 0:002> k # Child-SP RetAddr Call Site 00 00000000`00bbf478 000007fe`fd8c10ac ntdll!ZwWaitForSingleObject+0xa 01 00000000`00bbf480 000007fe`f9232c77 KERNELBASE!WaitForSingleObjectEx+0x79 02 00000000`00bbf520 000007fe`f9232c2f clr!CLREventWaitHelper2+0x3c 03 00000000`00bbf560 000007fe`f9232bb0 clr!CLREventWaitHelper+0x1f 04 00000000`00bbf5c0 000007fe`f939cae5 clr!CLREventBase::WaitEx+0x7c 05 00000000`00bbf650 000007fe`f939d891 clr!SVR::t_join::join+0x10f 06 00000000`00bbf6b0 000007fe`f939ce57 clr!SVR::gc_heap::mark_phase+0x385 07 00000000`00bbf750 000007fe`f939d0c6 clr!SVR::gc_heap::gc1+0xa7 08 00000000`00bbf7a0 000007fe`f939c854 clr!SVR::gc_heap::garbage_collect+0x870 ... GC Thread 12: 0:013> k # Child-SP RetAddr Call Site 00 00000000`0c17ebc8 000007fe`fd8c10ac ntdll!ZwWaitForSingleObject+0xa 01 00000000`0c17ebd0 000007fe`f9232c77 KERNELBASE!WaitForSingleObjectEx+0x79 02 00000000`0c17ec70 000007fe`f9232c2f clr!CLREventWaitHelper2+0x3c 03 00000000`0c17ecb0 000007fe`f9232bb0 clr!CLREventWaitHelper+0x1f 04 00000000`0c17ed10 000007fe`f939cae5 clr!CLREventBase::WaitEx+0x7c 05 00000000`0c17eda0 000007fe`f939df75 clr!SVR::t_join::join+0x10f 06 00000000`0c17ee00 000007fe`f939d879 clr!SVR::gc_heap::scan_dependent_handles+0x65 07 00000000`0c17ee30 000007fe`f939ce57 clr!SVR::gc_heap::mark_phase+0x36d 08 00000000`0c17eed0 000007fe`f939d0c6 clr!SVR::gc_heap::gc1+0xa7 09 00000000`0c17ef20 000007fe`f939c854 clr!SVR::gc_heap::garbage_collect+0x870 usually caused by managed heap corruption https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-download-tools
- 18. 18 0:000> .exr -1 ExceptionAddress: 00000000778e7b9f (ntdll!RtlpLowFragHeapAllocFromContext+0x000000000000013f) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 0000000000000001 Parameter[1]: 0000000000160fe0 Attempt to write to address 0000000000160fe0 0:000> k # Child-SP RetAddr Call Site 00 00000000`00160fb0 00000000`778e7974 ntdll!RtlpLowFragHeapAllocFromContext+0x13f 01 00000000`00161090 000007fe`fdc7ca20 ntdll!RtlAllocateHeap+0xe4 02 00000000`001611a0 00000000`00000002 SomeAntivirusDLL+0x6ca20 03 00000000`001611a8 00000000`00000208 0x2 04 00000000`001611b0 01d4c79a`ffff0000 0x208 05 00000000`001611b8 00000000`00328a10 0x01d4c79a`ffff0000 06 00000000`001611c0 00000000`00000208 0x328a10 07 00000000`001611c8 000007fe`fdc6c2c1 0x208 08 00000000`001611d0 00000000`00000008 SomeAntivirusDLL+0x5c2c1 09 00000000`001611d8 000007fe`fddd8816 0x8 ... https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-download-tools
- 20. 20 Conclusion • Invest in monitoring – Logs, application metrics, infrastructure metrics. • Don’t be too proud to hire an expert. • Invest in your developers diagnostic skills. • Sometimes you can really blame the anti-virus. ¯_(ツ)_/¯
- 21. 21 Thank you! @tamir_dresher Chief Architect @ Clarizen
Editor's Notes
- Top 10 customers alone represent 6 different industries: (in rank order) Financial Services Technology (HW / SW / SaaS) Agriculture Retail Travel & Hospitality Automotive So how does Clarizen’s solution bring everything together and empower customers to drive business agility. Our comprehensive suite helps you manage your work. Starting with managing demand and evaluating portfolio investments, assigning resources and optimizing them to address business needs. Robust project execution which includes tracking people’s time and expenses, as well as costs alongside revenues. We allow you to collaborate on a shared platform with your customers and partners. We know that highly collaborative project execution delivers higher success rates. These are powered by robust workflow engine. While solutions are delivered out of the box based on your specific needs, we also offer the ability to customize to your bsuiness needs. The outputs can be consumed through our web and mobile app in reports and dashboards. We also have an extension number of add-ons through the Apps Marketplace. As we address critical business processes, we recognize the need to integrate with other systems of record. We provide 3 methods of integration: RestAPIs, built-in iPaas platform (iHub) or 3rd party iPaas Platforms. And we have pre-built integrations with the most common work management tools, such as Doc Mgmt tools (SP, Box, Google), Salesforce (for PS orgs), JIRA & ServiceNow, as well as ERP systems (Oracle, Netsuite, etc).