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To use this tool, you must specify --tool=dhat on the Valgrind command line. DHAT is primarily a tool for examining how programs use their heap allocations. It tracks the allocated blocks, and inspects every memory access to find which block, if any, it is to. It presents, on a program point basis, information about these blocks such as sizes, lifetimes, numbers of reads and writes, and read and w
What Is SQLite? SQLite is a C-language library that implements a small, fast, self-contained, high-reliability, full-featured, SQL database engine. SQLite is the most used database engine in the world. SQLite is built into all mobile phones and most computers and comes bundled inside countless other applications that people use every day. More Information... The SQLite file format is stable, cross
# Create a vector index using the HNSW algorithm, 768 dimension length, and inner product distance metric > FT.CREATE idx-videos ON HASH PREFIX 1 video: SCHEMA content_vector VECTOR HNSW 6 TYPE FLOAT32 DIM 768 DISTANCE_METRIC IP content TEXT metadata TEXT # Add a video vector with metadata > HSET video:0 content_vector “\xa4q\t=\xc1\xdes\xbdZ$<\xbd\xd5\xc1\x99<b\xf0\xf2<x[…\xf8<” content “SUMMARY:
MemTest86 The standard for memory diagnostics Boots from a USB flash drive to test the RAM in your computer for faults. Utilizing algorithms that have been in development for over 20 years. MemTest86 is the original, free, stand alone memory testing software for x86 and ARM computers. MemTest86 boots from a USB flash drive and tests the RAM in your computer for faults using a series of comprehensi
原稿の執筆が一段落して心に余裕が出てきた@cubicdaiyaです。 今回はサーバを運用しているとありがちなページキャッシュに関する問題とメルカリのアプローチについて解説します。 Fluentdによるログ転送 話は変わりますが、メルカリの各サーバ上ではプログラムが吐いたログデータをKibanaやNorikraといった各種コンポーネントに転送するためにFluentdが稼働しています。各ログデータは原則単一のファイルに追記されてFluentdのtailプラグインによって各所に転送されていきます。 ログデータのサイズはまちまちで、1日で数GB程度のログデータもあれば数十GB以上のログデータもあります。 ページキャッシュと巨大なログファイル 各サーバに吐かれるログデータのサイズはサーバに搭載されているメモリのサイズと比べると1日分だけでもかなりの量になります。そして、このように絶えず書き込まれる巨
Dr. Memory is a memory monitoring tool capable of identifying memory-related programming errors such as accesses of uninitialized memory, accesses to unaddressable memory (including outside of allocated heap units and heap underflow and overflow), accesses to freed memory, double frees, memory leaks, and (on Windows) handle leaks, GDI API usage errors, and accesses to un-reserved thread local stor
smem is a tool that can give numerous reports on memory usage on Linux systems. Unlike existing tools, smem can report proportional set size (PSS), which is a more meaningful representation of the amount of memory used by libraries and applications in a virtual memory system. Because large portions of physical memory are typically shared among multiple applications, the standard measure of memory
It’s been quite quiet here at my so-called blog lately. But after adding a new feature to Inception, I thought it was about time to do a small writeup. Over the last months I’ve completely restructured Inception. The tool is now more loosely coupled, and I’ve made it easier to create modules exploiting DMA. More on that in a later post. I’ve also added one, major functionality: The ability to impl
mcelog logs and accounts machine checks (in particular memory, IO, and CPU hardware errors) on modern x86 Linux systems. mcelog is required by both 32bit x86 Linux kernels (since 2.6.30) and 64bit Linux kernels (since early 2.6 kernel releases) to log machine checks and should run on all Linux systems that need error handling. The mcelog daemon accounts memory and some other errors errors in vario
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vmtouch - the Virtual Memory Toucher Portable file system cache diagnostics and control Download from github Read the online manual vmtouch is a tool for learning about and controlling the file system cache of unix and unix-like systems. It is BSD licensed so you can basically do whatever you want with it. Quick install guide: $ git clone https://github.com/hoytech/vmtouch.git $ cd vmtouch $ make
Valgrind's Tool Suite The Valgrind distribution includes the following debugging and profiling tools: Memcheck Cachegrind Callgrind Massif Helgrind DRD DHAT Experimental Tools Other Tools Memcheck Memcheck detects memory-management problems, and is aimed primarily at C and C++ programs. When a program is run under Memcheck's supervision, all reads and writes of memory are checked, and calls to mal
The Portable Hardware Locality (hwloc) software package provides a portable abstraction (across OS, versions, architectures, ...) of the hierarchical topology of modern architectures, including NUMA memory nodes (DRAM, HBM, non-volatile memory, CXL, etc.), processor packages, shared caches, cores and simultaneous multithreading. It also gathers various system attributes such as cache and memory in
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