JOEFON JANN: Distinguished Engineer, IBM T.J.Watson Research Center, Yorktown Heights, NY, USA
AREAS OF RESEARCH: Systems Software(OS, hypervisor, systems management for clusters with availability), social graph analysis using linear algebra, security and PQC(Post Quantum Cryptography) optimizations for POWER systems, study the use of AI technologies

Education:

Related Scholarly Links:

Major Projects

• The Jann Model of Massively Parallel Workloads
  This is a compact and flexible model to represent the arrival times, and service times distribution of workloads at supercomputing centers. This is a phase-type (Hyper-Erlang)  probability distribution model. It is convenient for use in queueing-theory   based analyses. The model has very few parameters and they are analytically derivable from the observation of the workload. It is convenient to use this model to develop job schedulers for HPC datacenters. Parallel workload models Archive


• DLPAR (Dynamic Logical Partitioning) Wikipedia article
  This work forms the fundamental building blocks for Virtualization for IBM POWER Servers since POWER4 (see also IBM Systems Journal paper).


• Multiple Concurrently Pageable Page-sizes in AIX -- yielding industry leading-edge performance


• Kernel Hot Patch -- the basis for the eFix manager for delivering Emergency patches for AIX


• AHAFS (Autonomic Health Advisor FileSystem) -- on which the PowerSC RTC(RealTime Compliance) offering is built


• RBAC(Role-Based Access Control) and framework in AIX -- Enhancing Security & ease-of-use for applications and OS administration


• Memory Keys Support in AIX in POWER6


• AIX AutoDiag tool -- which instaneously finds closest problems and lists their fixes, upon submission of an OS dump; using AI(Artificial Intelligence) techniques


• PQC(Post Quantum Cryptography) optimizations for IBM POWER systems


• PowerVM-SDN with video on youTube

Selected Publications:

• The Jann Model of Massively Parallel Workloads


• DLPAR article in Encyclopedia of Parallel Computing


• (DLPAR): Basic Building Blocks for Autonomic Computing in IBM pSeries Servers. IBM Systems Journal's special issue on Autonomic Computing, Vol 42, No. 1, 2/2003.


• Graph Programming Interface of Sparse Matrices for Social Graphs -- now standardized in GraphBLAS
  


• Best paper: Towards an Immortal Operating System in Virtual Environments by Joefon Jann, et al
  in the "Best of SBAC-PAD2012" issue of the Elsevier Journal of Parallel Processing


• Best paper award HiPC-1997: Lazy Home Migration for Distributed Shared Memory Systems
  by Sandra Baylor, Kattamuri Ekanadham, Joefon Jann, Beng-Hong Lim & Pratap Pattnaik


• Book Forward for the book titled "AIX Performance"


• IBM Journal of Research and Development paper titled "Advanced Features in POWER8 Systems" - 1/2015


• IBM Journal of Research and Devleopment paper titled "What's New in POWER9 System Software" - 7/2018


• Many others: Search for "Joefon Jann" in Google Scholar and in https://dblp.uni-trier.de/search?q=Joefon

Patents (reverse time order)

1. FileSystem Object Protection from Ransomware Attacks -- Mar 17, 2025. US 12254090
2. Encryption Monitor Register and System -- Apr 09, 2024. US 11954337
3. Discovery And Recreation Of Communication Endpoints In Virtual Machine Migration System -- May 02, 2022. US 11321112
4. Certification for Connection of Virtual Communication Endpoints -- Sep 09, 2021. US 20210281561
5. Software Patch Management incorporating Sentiment Analysis -- Aug 03, 2021. US 11080037
6. Reducing memory access latency in scatter/gather operations -- Jan 05, 2021. US 10884942
7. Sharing ownership of an input/output device using a device driver partition -- Aug 25, 2020. US 10754676
8. Shared memory in a virtual environment -- Jun 16, 2020. US 10684959
9. Invalidation of shared memory in a virtual environment -- Jul 30, 2019. US 10365825
10. Extending trusted hypervisor functions with existing device drivers -- Jul 16, 2019. US 10353727
11. Invalidation of shared memory in a virtual environment -- Feb 19, 2019. US 10209889
12. Shared memory in a virtual environment -- Jan 08, 2019. US 10176115
13. Software patch management incorporating sentiment analysis -- Oct 30, 2018. US 0259638
14. Automated diagnosis of software crashes -- Aug 20, 2018. US 9436540
    
15. Mitigating collisions in a physical space during gaming -- Nov 14, 2017. US 9814982
16. Sophisticated run-time system for graph processing -- Oct 03, 2017. US 9778967
17. Sophisticated run-time system for graph processing -- Sep 26, 2017. US 9772890
18. Automated diagnosis of software crashes -- Nov 03, 2016. US 0321126
19. Optimized system for analytics (graphs and sparse matrices) operations -- Jul 26, 2016. US 9400700
    
20. Optimized system for analytics (graphs and sparse matrices) operations -- Apr 04, 2016. US 9304835
    
21. Method and apparatus for operating system event notification mechanism using file system interface -- Jan 13, 2015. US 8935579
    
22. System using a unique marker with each software code-block -- Sep 30, 2014. US 8850410
    
23. Method for reducing the time to diagnose the cause of unexpected changes to system files -- Dec 31, 2013. US 8621605
    
24. System and method for supporting a plurality of access control list types for a file system in an operating -- Apr 23, 2013. US 8429192
    
25. Method and apparatus for operating system event notification mechanism using file system interface -- Mar 22, 2013. Japan 5225391.
26. Method and apparatus for operating system event notification mechanism using file system interface -- Jun 12, 2012. US 8201029
    
27. Automated transition to a recovery kernel via firmware-assisted-dump flows providing automated operating system diagnosis and repair -- Mar 06, 2012. US 8132057
28. Method and infrastructure for detecting and/or servicing a failing/failed operating system instance -- Jul 12, 2011. US 7979749
29. Framework for managing attributes of objects -- Feb 22, 2011. US 7895435
30. Method and structure for low memory relocation for dynamic memory reconfiguration -- Feb 10, 2009. US 7490206
31. Method and mechanism for efficiently creating large virtual memory pages in a multiple page size environment -- Oct 14, 2008. US 7437529
32. Method and apparatus for broadcasting messages with set priority to guarantee knowledge of a state within a data processing system -- Sep 05, 2006. US 7103752
33. Secure partitioning of shared memory based multiprocessor system -- Nov 12, 2002. US 6480941
34. Home node migration for distributed shared memory systems -- Apr 13, 1999. US 5893922

• Additional Patent Applications filed ...

Contact Info:

EMAIL: joefon@us.ibm.com
Alternate email: joefon.jann@gmail.com

ADDRESS:
Joefon Jann
IBM T.J. Watson Research Center
1101 Kitchwan Road, Yorktown Heights,
NY 10598. USA
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