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Linux kernel BUG: About hugetlb[.]c in mm folder (22nd Mar 2023)
Preface: Enabling HugePages makes it possible for the operating system to support memory pages greater than the default (usually 4 KB). Using very large page sizes can improve system performance by reducing the amount of system resources required to access page table entries. Background: For Red Hat Enterprise Linux systems, it is recommend configure HugeTLB…
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Have you upgraded your Linux kernel? (15th Mar 2023)
Preface: Blue screen of death (BSOD) is error display on Windows commonly. In Linux, it is unlikely and uncommon, but is it possible? Background: As the only copyright holder to the GPL-covered components of the software, you are free to add exceptions and additional terms to the GPLv3, as described in section 7 of that…
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ndctl: release v76.1, have you update yet? (14th Mar 2023)
Preface: Preface: Advantages of NVDIMMs in servers. NVDIMMs provide high-speed DRAM performance coupled with flash-backed persistent storage. Aside from providing an additional memory tier in servers, NVDIMM persistence allows applications to continue processing I/O traffic during planned or unexpected system failures. Background: Persistent Memory (PM) is a type of Non-Volatile Memory (NVM). The ndctl utility…
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hiccup, web server load balancing solution 3rd May 2022
Preface: Online banking cannot lack of load balancing solution today. However in terms of life cycle of operation system and software libaries , Java language development platform and on-demand custom fuctions. Does it bother the load balancing functions? The most challenging parts is the layer 7 load balancing. Perhaps you can do the healt check…
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Does SpaceX use C language? 23rd Sep, 2021
Preface: SpaceX was founded in 2002 by Elon Musk with the goal of reducing space transportation costs to enable the colonization of Mars. Background: Exploring Mars helps scientists understand major changes in climate that can fundamentally change the planet. It also allows us to look for biological features that might reveal whether there was abundant…
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Who makes supercomputers faster and faster (CPU, fibre interconnect, parallel processing or virtual machine)? 29th June, 2021.
Preface: In Japanese mythology, the Namazu (鯰) or Ōnamazu (大鯰) is a giant underground catfish who causes earthquakes. This giant not caused disaster, he is the fastest supercomputer in the world. His name is FUGAKU. Background: Riken and Fujitsu started developing the system in 2014, working closely with ARM to design the A64FX processor. Each…
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intel new processor embedded anti malware feature – 15th june 2020
Preface: Starting with Oracle 11g release 1 (11.1), there is a just-in-time (JIT) compiler for Oracle JVM environment. A JIT compiler for Oracle JVM enables much faster execution because, it manages the invalidation, recompilation, and storage of code without an external mechanism. Background: A way to prevent attack code execution by stack and heap. It…
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2019 – The security protection of Docker, where are they?
Preface: Sysadmin may unintentionally expose a Docker registry service without enforcing proper access control, said Palo Alto Networks. Background: Easy to deploy, one of the goal of container-based technology. Docker storing image in a managed collection, with standardized methods of identifying, committing, and pulling individual images. With this feature it is equivalent as a image…
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How we focus design weakness?
Preface: Flaws that require root access are not considered security issues in existing policy. If we are not using cloud computing concept. It is acceptable. But we need cloud system! Security focus: Turkish information security specialist found a design weakness in Windows kernel design. According to the vendor’s Bug Bounty program rules, flaws that require…
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He is a bird – Taiwan supercomputer (Nov 2018)
Preface: There are many reasons for wanting to combine the two parallel programming approaches of MPI and CUDA. A common reason is to enable solving problems with a data size too large to fit into the memory of a single GPU, or that would require an unreasonably long compute time on a single node. The…