leakdice-rust
librdkafka
leakdice-rust | librdkafka | |
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4 | 18 | |
9 | 7,294 | |
- | 0.7% | |
0.0 | 8.3 | |
over 2 years ago | 5 days ago | |
Rust | C | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
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leakdice-rust
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My Rust program (Well, game) is leaking memory, 4MB/s.
Maybe try Leakdice: https://github.com/tialaramex/leakdice in C or rewritten in Rust: https://github.com/tialaramex/leakdice-rust/
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Twenty Years of Valgrind
In my obviously biased opinion, very specialised, but sometimes exactly what you needed (I have used this in anger maybe 2-3 times in my career since then, which is why I wrote the C version):
https://github.com/tialaramex/leakdice (or https://github.com/tialaramex/leakdice-rust)
Leakdice implements some of Raymond Chen's "The poor man’s way of identifying memory leaks" for you. On Linux at least.
https://bytepointer.com/resources/old_new_thing/20050815_224...
All leakdice does is: You pick a running process which you own, leakdice picks a random heap page belonging to that process and shows you that page as hex + ASCII.
The Raymond Chen article explains why you might ever want to do this.
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Hunting down a C memory leak in a Go program
(or there's a Rust rewrite https://github.com/tialaramex/leakdice-rust because I was learning Rust)
leakdice is not a clever, sophisticated tool like valgrind, or eBPF programming, but that's fine because this isn't a subtle problem - it's very blatant - and running leakdice takes seconds so if it wasn't helpful you've lost very little time.
Here's what leakdice does: It picks a random heap page of a running process, which you suspect is leaking, and it displays that page as ASCII + hex.
That's all, and that might seem completely useless, unless you either read Raymond Chen's "The Old New Thing" or you paid attention in statistics class.
Because your program is leaking so badly the vast majority of heap pages (leakdice counts any pages which are writable and anonymous) are leaked. Any random heap page, therefore, is probably leaked. Now, if that page is full of zero bytes you don't learn very much, it's just leaking blank pages, hard to diagnose. But most often you're leaking (as was happening here) something with structure, and very often sort of engineer assigned investigating a leak can look at a 4kbyte page of structure and go "Oh, I know what that is" from staring at the output in hex + ASCII.
This isn't a silver bullet, but it's very easy and you can try it in like an hour (not days, or a week) including writing up something like "Alas the leaked pages are empty" which isn't a solution but certainly clarifies future results.
- `Zig Cc`: A Powerful Drop-In Replacement for GCC/Clang
librdkafka
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Do you use Rust in your professional career?
recent PR: https://github.com/confluentinc/librdkafka/pull/4275
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JR, quality Random Data from the Command line, part I
# Kafka configuration # https://github.com/confluentinc/librdkafka/blob/master/CONFIGURATION.md bootstrap.servers= security.protocol=SASL_SSL sasl.mechanisms=PLAIN sasl.username= sasl.password= compression.type=gzip compression.level=9 statistics.interval.ms=1000
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A Critical Detail about Kafka Partitioners
But what about Kafka producer clients in other languages? The excellent librdkafka project is a C/C++ implementation of Kafka clients and is widely used for non-JVM Kafka applications. Additionally, Kafka clients in other languages (Python, C#) build on top of it. The default partitioner for librdkafka uses the CRC32 hash function to get the correct partition for a key.
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Horizontally scaling Kafka consumers with rendezvous hashing
We could have made some changes at the librdkafka level (see this), but we didn’t really want to pursue this (at least not yet).
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Events with same key going to different partitions
You want records with the same key to always land on the same partition, so you need all the clients to use the same hashing algorithm. The easiest way to do that is to make sure the librdkafka client uses the java compatible murmur2_random hash algorithm. See “Partitioner” section here: https://github.com/confluentinc/librdkafka/blob/master/CONFIGURATION.md
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Getting sum type values from a map
As my first "real world" (ish) project in Vlang, I'm trying to copy https://github.com/confluentinc/confluent-kafka-go, which is a Go wrapper for Kafka C client library, https://github.com/edenhill/librdkafka
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Installing node-rdkafka on M1 for use with SASL
If you're using Kafka in a Node.js app, it's likely that you'll need node-rdkafka. This is a library that wraps the librdkafka library and makes it available in Node.js. According to the project's README, "All the complexity of balancing writes across partitions and managing (possibly ever-changing) brokers should be encapsulated in the library."
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Introduction to Key Apache KafkaⓇ Concepts
# Parse the configuration. # See https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md config_parser = ConfigParser() config_parser.read_file(args.config_file) config = dict(config_parser['default']) # Create Producer instance producer = Producer(config)
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video analytics on edge
• git clone https://github.com/edenhill/librdkafka.git
- librdkafka - the Apache Kafka C/C++ client library
What are some alternatives?
libclang_rt.builtins-wasm32.a - The missing libclang_rt.builtins-wasm32.a file to compile to WebAssembly.
CVE-2022-27254 - PoC for vulnerability in Honda's Remote Keyless System(CVE-2022-27254)
bytehound - A memory profiler for Linux.
sarama - Sarama is a Go library for Apache Kafka. [Moved to: https://github.com/IBM/sarama]
mevi - A memory visualizer in Rust (ptrace + userfaultfd)
Karafka - Ruby and Rails efficient multithreaded Kafka processing framework
Confluent Kafka Golang Client - Confluent's Apache Kafka Golang client
kafka-go - Kafka library in Go
sanitizers - AddressSanitizer, ThreadSanitizer, MemorySanitizer
rsyslog - a Rocket-fast SYStem for LOG processing
jemalloc
rust-kafka-101 - Getting started with Rust and Kafka